DTM Contributions 2004-2005

(Updated through 30 September 2005)

6192 Alard, O., A. Luguet, N. J. Pearson, W. L. Griffin, J.-P. Lorand, A. Gannoun, K. W. Burton, and S. Y. O'Reilly, In situ Os isotopes in abyssal peridotites bridge the isotopic gap between MORBs and their source mantle, Nature 436, 1005-1008, 2005. (No reprints available.)

6193 Alexander, C. M. O'D., Re-examining the role of chondrules in producing the elemental fractionations in chondrites, Meteoritics Planet. Sci. 40, 943-965, 2005.

6189 Alexander, C. M. O'D., and J. N. Grossman, Alkali elemental and potassium isotopic compositions of Semarkona chondrites, Meteoritics Planet. Sci. 40, 541-556, 2005.

6143 Arrowsmith, S. J., M. Kendall, N. White, J. C. VanDecar, and D. C. Booth, Seismic imaging of a hot upwelling beneath the British Isles, Geology 33, 345-348, 2005. (No reprints available.)

6136 Aubaud, C., E. H. Hauri, and M. M. Hirschmann, Hydrogen partition coefficients between nominally anhydrous minerals and basaltic melts, Geophys. Res. Lett. 31, L20611, 10.1029/2004GL021341, 2004. (No reprints available.)

6144 Bedding, T. R., H. Kjeldsen, F. Bouchy, H. Bruntt, R. P. Butler, D. L. Buzasi, J. Christensen-Dalsgaard, S. Frandsen, J.-C. Lebrun, M. Martic, and J. Schou, The non-detection of oscillations in Procyon by MOST: is it really a surprise?, Astron. Astrophys. 432, L43-L48, 2005. (No reprints available.)

6137 Behn, M. D., J. Lin, and M. T. Zuber, Effects of hydrothermal cooling and magma injection on mid-ocean ridge temperature structure, deformation, and axial morphology, inMid-Ocean Ridges: Hydrothermal Interactions Between the Lithosphere and Oceans, C. R. German, J. Lin, and L. M. Parson, eds., pp. 151-166, American Geophysical Union, Washington, D.C., 2004. (No reprints available.)

6194 Bickford, M. E., T. D. Mock, W. E. Steinhart, III, K. D. Collerson, and J. F. Lewry, Origin of the Archean Sask craton and its extent within the Trans-Hudson orogen: evidence from Pb and Nd isotopic compositions of basement rocks and post-orogenic intrusions, Can. J. Earth Sci. 42, 659-684, 2005. (No reprints available.)

6172 Borucki, W., D. Koch, A. Boss, E. Dunham, A. Dupree, J. Geary, R. Gilliland, S. Howell, J. Jenkins, Y. Kondo, D. Latham, J. Lissauer, and H. Reitsema, The Kepler mission: a technical overview, in Second Eddingtion Workshop: Stellar Structure and Habitable Planet Finding, F. Favata, S. Aigrain, and A. Wilson, eds., pp. 177-182, Special Publication SP-538, European Space Agency, Noordwijk, Netherlands, 2004. (No reprints available.)

6135 Boss, A. P., Evolution of the solar nebula. VI. Mixing and transport of isotopic heterogeneity, Astrophys. J. 616, 1265-1277, 2004.

6139 Boss, A. P., Early solar system: shock fronts in Hawaii, Nature 432, 957-958, 2004.

6146 Boss, A. P., Collapse and fragmentation of molecular cloud cores. VIII. Magnetically supported infinite sheets, Astrophys. J. 622, 393-403, 2005.

6174 Boss, A. P., Modes of gaseous planet formation, in Planetary Systems in the Universe:Observation, Formation and Evolution, A. Penny et al., eds., pp. 141-148, International Astronomical Union Symposium 202, Astronomical Society of the Pacific, San Francisco, 2004.

6175 Boss, A. P., From molecular clouds to circumstellar disks, in Comets II, M. C. Festou, H. U. Keller, and H. A. Weaver, eds., pp. 67-80, University of Arizona Press, Tucson, 2004.

6191 Boss, A. P., Evolution of the solar nebula. VII. Formation and survival of protoplanets formed by disk instability, Astrophys. J. 629, 535-548, 2005.

6212 Boss, A. P., Formation of gas and ice giant planets, in EPSL Frontiers, Collection 2002-2003, A. Halliday, ed., pp. 17-27, Elsevier, Amsterdam, 2004. [Reprinted from Earth Planet.Sci. Lett. 202, 513-523, 2002.] (No reprints available.)

6145 Boss, A. P., and R. H. Durisen, Chondrule-forming shock fronts in the solar nebula: a possible unified scenario for planet and chondrite formation, Astrophys. J. (Lett.) 621, L137-L140, 2005.

6195 Boyet, M., and R. W. Carlson, ¹⁴²Nd evidence for early (> 4.53 Ga) global differentiation of the silicate Earth, Science 309, 576-581, 2005.

6167 Brown, L., Isotopic analysis, in Encyclopedia of 20th-Century Technology, C. A. Hempstead and W. E. Worthington, Jr., eds., vol. 1, pp. 450-451, Routledge, New York, 2004. (No reprints available.)

6168 Brown, L., Radar, Defensive systems in World War II, in Encyclopedia of 20th-Century Technology, C. A. Hempstead and W. E. Worthington, Jr., eds., vol. 2, pp. 623-625, Routledge, New York, 2004. (No reprints available.)

6169 Brown, L., Radar, Origins to 1939, in Encyclopedia of 20th-Century Technology, C. A. Hempstead and W. E. Worthington, Jr., eds., vol. 2, pp. 632-633, Routledge, New York, 2004. (No reprints available.)

6170 Brown, L., Radioactive dating, in Encyclopedia of 20th-Century Technology, C. A. Hempstead and W. E. Worthington, Jr., eds., vol. 2, pp. 650-652, Routledge, New York, 2004. (No reprints available.)

6173 Butler, R. P., G. W. Marcy, D. A. Fischer, S. S. Vogt, C. G. Tinney, H. R. A. Jones, A. J. Penny, and K. Apps, Statistical properties of extrasolar planets, in Planetary Systems in the Universe: Observation, Formation and Evolution, A. Penny et al., eds., pp. 3-11, International Astronomical Union Symposium 202, Astronomical Society of the Pacific, San Francisco, 2004.

6140 Butler, R. P., S. S. Vogt, G. W. Marcy, D. A. Fischer, J. T. Wright, G. W. Henry, G. Laughlin, and J. J. Lissauer, A Neptune-mass planet orbiting the nearby M dwarf GJ436,Astrophys. J. 617, 580-588, 2004. (No reprints available.)

6196 Carlson, R. W., Application of the Pt-Re-Os isotopic systems to mantle geochemistry and geochronology, Lithos 82, 249-272, 2005.

6147 Carlson, R. W., D. G. Pearson, and D. E. James, Physical, chemical, and chronological characteristics of continental mantle, Rev. Geophys. 43, RG1001, 10.1029/2004RG000156, 2005.

6148 Chadwick, J., M. Perfit, I. Ridley, G. Kamenov, W. Chadwick, R. Embley, P. le Roux, and M. Smith, Magmatic effects of the Cobb hot spot on the Juan de Fuca Ridge, J. Geophys.Res. 110, B03101, 10.1029/2003JB002767, 2005. (No reprints available.)

6133 Chandar, R., B. Whitmore, and M. G. Lee, The globular cluster systems of five nearby spiral galaxies: new insights from Hubble Space Telescope imaging, Astrophys. J. 611, 220-244, 2004. (No reprints available.)

6188 Clampin, M., G. J. Melnick, R. G. Lyon, H. Ford, J. R. P. Angel, D. Y. Gezari, D. A. Golimowski, G. F. Hartig, M. Harwit, M. Holman, G. D. Illingworth, S. Kenyon, D. N. Lin, M. Marley, S. S. Olivier, L. Petro, D. D. Sasselov, J. L. Schneider, S. Seager, M. Shao, W. B. Sparks, V. Tolls, A. Weinberger, H. Smith, R. C. Carter, R. A. Woodruff, B. Hyatt, S. E. Kendrick, and D. Purmot, Extrasolar Planetary Imaging Coronagraph (EPIC), in Optical, Infrared, and Millimeter Space Telescopes, J. C. Mather, ed., pp. 1538-1544, SPIE Proceedings Vol. 5487, SPIE, Bellingham, Wash., 2004. (No reprints available.)

6171 Clayton, D. D., and L. R. Nittler, Presolar stardust grains, in Origin and Evolution of the Elements, A. McWilliam and M. Rauch, eds., pp. 297-316, Carnegie Observatories Astrophysics Series, Vol. 4, Cambridge University Press, Cambridge and New York, 2004. (No reprints available.)

6149 Cody, G. D., and C. M. O'D. Alexander, NMR studies of chemical structural variation of insoluble organic matter from different carbonaceous chondrite groups, Geochim.Cosmochim. Acta 69, 1085-1097, 2005.

6197 Cowie, P. A., J. R. Underhill, M. D. Behn, J. Lin, and C. E. Gill, Spatio-temporal evolution of strain accumulation derived from multi-scale observations of Late Jurassic rifting in the northern North Sea: a critical test of models for lithospheric extension, Earth Planet. Sci. Lett. 234, 401-419, 2005. (No reprints available.)

6198 de Moor, J. M., T. P. Fischer, D. R. Hilton, E. Hauri, L. A. Jaffe, and J. T. Camacho, Degassing at Anatahan volcano during the May 2003 eruption: implications from petrology, ash leachates, and SO₂ emissions, J. Volcanol. Geotherm. Res. 146, 117-138, 2005. (No reprints available.)

6150 Deleuil, M., J.-C. Bouret, C. Catala, A. Lecavelier des Etangs, A. Vidal-Madjar, A. Roberge, P. D. Feldman, C. Martin, and R. Ferlet, New insights in the FUV into the activity of the Herbig Ae star HD 163296, Astron. Astrophys. 429, 247-255, 2005. (No reprints available.)

6151 Deming, D., S. Seager, L. J. Richardson, and J. Harrington, Infrared radiation from an extrasolar planet, Nature 434, 740-743, 2005.

6152 Dyudina, U. A., P. D. Sackett, D. D. R. Bayliss, S. Seager, C. C. Porco, H. B. Throop, and L. Dones, Phase light curves for extrasolar Jupiters and Saturns, Astrophys. J. 618, 973-986, 2005. (No reprints available.)

6153 Fischer, D. A. , G. Laughlin, P. Butler, G. Marcy, J. Johnson, G. Henry, J. Valenti, S. Vogt, M. Ammons, S. Robinson, G. Spear, J. Strader, P. Driscoll, A. Fuller, T. Johnson, E. Manrao, C. McCarthy, M. Muñoz, K. L. Tah, J. Wright, S. Ida, B. Sato, E. Toyota, and D. Minniti, The N2K Consortium. I. A hot Saturn planet orbiting HD 88133, Astrophys. J. 620,481-486, 2005. (No reprints available.)

6203 Fischer, D. A., G. W. Marcy, R. P. Butler, and S. S. Vogt, Characteristics of extrasolar planets, in Debris Disks and the Formation of Planets, L. Caroff et al., eds., pp. 133-142, Conference Series, Vol. 324, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6216 Flesch, L. M., W. E. Holt, P. G. Silver, M. Stephenson, C.-Y. Wang, and W. W. Chan, Constraining the extent of crust-mantle coupling in Central Asia using GPS, geologic, and shear-wave splitting data, Earth Planet. Sci. Lett. 238, 248-268, 2005.

6154 Gaudi, B. S., S. Seager, and G. Mallén-Ornelas, On the period distribution of close-in extrasolar giant planets, Astrophys. J. 623, 472-481, 2005. (No reprints available.)

6208 Grady, C. A., B. E. Woodgate, C. W. Bowers, T. R. Gull, M. L. Sitko, W. J. Carpenter, D. K. Lynch, R. W. Russell, R. B. Perry, G. M. Williger, A. Roberge, J.-C. Bouret, and M. Sahu, Coronagraphic imaging of pre-main-sequence stars with the Hubble Space Telescope Space Telescope Imaging Spectrograph. I. The Herbig Ae stars, Astrophys. J. 630, 958-975, 2005. (No reprints available.)

6155 Haghighipour, N., On the asymptotic character of electromagnetic waves in a Friedmann-Robertson-Walker universe, Gen. Relativ. Gravitation 37, 327-342, 2005. (No reprints available.)

6156 Hulbert, L. J., M. A. Hamilton, M. F. Horan, and R. F. J. Scoates, U-Pb zircon and Re-Os isotope geochronology of mineralized ultramafic intrusions and associated nickel ores from the Thompson nickel belt, Manitoba, Canada, Econ. Geol. 100, 29-41, 2005. (No reprints available.)

6134 Jeon, Y.-B., M. G. Lee, S.-L. Kim, and H. Lee, SX Phoenicis stars in the globular cluster NGC 5466, Astronom. J. 128, 287-299, 2004. (No reprints available.)

6179 Jones, H. R. A., R. P. Butler, C. G. Tinney, G. W. Marcy, C. McCarthy, A. J. Penny, and B. D. Carter, HD10647 and the distribution of exoplanet properties with semi-major axis, inExtrasolar Planets: Today and Tomorrow, J.-P. Beaulieu, A. Lecavelier des Etangs, and C. Terquem, eds., pp. 298-304, Conference Series, Vol. 321, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6157 Laughlin, G., R. P. Butler, D. A. Fischer, G. W. Marcy, S. S. Vogt, and A. S. Wolf, The GJ 876 planetary system: a progress report, Astrophys. J. 622, 1182-1190, 2005. (No reprints available.)

6199 Laughlin, G., G. W. Marcy, S. S. Vogt, D. A. Fischer, and R. P. Butler, On the eccentricity of HD 209458b, Astrophys. J. (Lett.) 629, L121-L124, 2005. (No reprints available.)

6158 Laughlin, G., A. Wolf, T. Vanmunster, P. Bodenheimer, D. Fischer, G. Marcy, P. Butler, and S. Vogt, A comparison of observationally determined radii with theoretical radius predictions for short-period transiting extrasolar planets, Astrophys. J. 621, 1072-1078, 2005. (No reprints available.)

6200 Marcy, G., R. P. Butler, D. Fischer, S. Vogt, J. T. Wright, C. G. Tinney, and H. R. A. Jones, Observed properties of exoplanets: masses, orbits, and metallicities, Prog. Theor.Phys. Suppl. 158, 24-42, 2005. (No reprints available.)

6177 Marcy, G. W., R. P. Butler, D. A. Fischer, and S. S. Vogt, A Doppler planet survey of 1330 FGKM stars, in Extrasolar Planets: Today and Tomorrow, J.-P. Beaulieu, A. Lecavelier des Etangs, and C. Terquem, eds., pp. 3-14, Conference Series, Vol. 321, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6159 Marcy, G. W., R. P. Butler, S. S. Vogt, D. A. Fischer, G. W. Henry, G. Laughlin, J. T. Wright, and J. A. Johnson, Five new extrasolar planets, Astrophys. J. 619, 570-584, 2005. (No reprints available.)

6181 Marcy, G. W., D. A. Fischer, R. P. Butler, and S. S. Vogt, Planetary messages in the Doppler residuals, in Planetary Systems in the Universe: Observation, Formation and Evolution, A. Penny et al., eds., pp. 20-28, International Astronomical Union Symposium 202, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6209 Martin-Zaïdi, C., M. Deleuil, T. Simon, J.-C. Bouret, A. Roberge, P. D. Feldman, A. Lecavelier des Etangs, and A. Vidal-Madjar, FUSE observations of molecular hydrogen on the line of sight towards HD 141569A, Astron. Astrophys. 440, 921-928, 2005. (No reprints available.)

6141 McCarthy, C., R. P. Butler, C. G. Tinney, H. R. A. Jones, G. W. Marcy, B. Carter, A. J. Penny, and D. A. Fischer, Multiple companions to HD 154857 and HD 160691, Astrophys. J. 617, 575-579, 2004. (No reprints available.)

6160 Nittler, L. R., Constraints on heterogeneous galactic chemical evolution from meteoritic stardust, Astrophys. J. 618, 281-296, 2005.

6211 Nittler, L. R., Presolar stardust in meteorites: recent advances and scientific frontiers, in EPSL Frontiers, Collection 2002-2003, A. Halliday, ed., pp. 1-15, Elsevier, Amsterdam, 2004. [Reprinted from Earth Planet. Sci. Lett. 209, 259-273, 2003.] (No reprints available.)

6201 Nittler, L. R., R. Gallino, M. Lugaro, O. Straniero, I. Dominguez, and E. Zinner, Si and C isotopes in presolar silicon carbide grains from AGB stars, Nucl. Phys. A 758, 348C-351C, 2005.

6210 Nittler, L. R., and P. Hoppe, Are presolar silicon carbide grains from novae actually from supernovae?, Astrophys. J. (Lett.) 631, L89-L92, 2005.

6215 Nittler, L. R., T. J. McCoy, P. E. Clark, M. E. Murphy, J. I. Trombka, and E. Jarosewich, Bulk element compositions of meteorites: a guide for interpreting remote-sensing geochemical measurements of planets and asteroids, Antarct. Meteorite Res. 17, 231-251, 2004.

6178 Richardson, L. J., D. Deming, and S. Seager, Strong limits on the infrared spectrum of HD 209458 b near 2.2 mm, in Extrasolar Planets: Today and Tomorrow, J.-P. Beaulieu, A. Lecavelier des Etangs, and C. Terquem, eds., pp. 211-212, Conference Series, Vol. 321, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6204 Roberge, A., P. D. Feldman, A. Lecavelier des Etangs, A. Vidal-Madjar, R. Ferlet, M. Deleuil, and J.-C. Bouret, Molecular hydrogen in circumstellar disk systems: results from FUSE, in Debris Disks and the Formation of Planets, L. Caroff et al., eds., pp. 235-237, Conference Series, Vol. 324, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6161 Roberge, A., A. J. Weinberger, and E. M. Malumuth, Spatially resolved spectroscopy and coronagraphic imaging of the TW Hydrae circumstellar disk, Astrophys. J. 622, 1171-1181, 2005.

6183 Roberge, A., A. J. Weinberger, S. Redfield, and P. D. Feldman, Rapid dissipation of primordial gas from the AU Microscopii debris disk, Astrophys. J. (Lett.) 626, L105-L108, 2005. (No reprints available.)

6206 Rubin, V. C., A puzzling polar-ring galaxy, Sky & Telescope 109 (no. 5), 26-27, 2005. (No reprints available.)

6142 Ryan, J. G., and P. R. Kyle, Lithium abundance and lithium isotope variations in mantle sources: insights from intraplate volcanic rocks from Ross Island and Marie Byrd Land (Antarctica) and other oceanic islands, Chem. Geol. 212, 125-142, 2004. (No reprints available.)

6205 Schneider, J., A. S. Cotera, M. D. Silverstone, and A. Weinberger, HST imaging of circumstellar disks, in Debris Disks and the Formation of Planets, L. Caroff et al., eds., pp. 247-249, Conference Series, Vol. 324, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6207 Schönbächler, M., D.-C. Lee, M. Rehkämper, A. N. Halliday, B. Hattendorf, and D. Günther, Nb/Zr fractionation on the Moon and the search for extinct ⁹²Nb, Geochim.Cosmochim. Acta 69, 775-785, 2005.

6214 Seager, S., The search for extrasolar Earth-like planets, in EPSL Frontiers, Collection 2002-2003, A. Halliday, ed., pp. 293-304, Elsevier, Amsterdam, 2004. [Reprinted from Earth Planet. Sci. Lett. 208, 113-124, 2003.] (No reprints available.)

6184 Seager, S., and E. B. Ford, The vegetation red edge spectroscopic feature as a surface biomarker, in Astrophysics of Life, M. Livio, I. N. Reid, and W. B. Sparks, eds., pp. 67-75, Cambridge University Press, Cambridge, 2005.

6185 Seager, S., E. L. Turner, J. Schafer, and E. B. Ford, Vegetation's red edge: a possible spectroscopic biosignature of extraterrestrial plants, Astrobiol. 5, 372-390, 2005.

6138 Shan, G., R. L. Rudnick, R. W. Carlson, W. F. McDonough, and L. Yongsheng, Removal of lithospheric mantle in the North China Craton: Re-Os isotopic evidence for coupled crust-mantle growth [in Chinese], Dixue Qianyuan (Earth Science Frontiers) 10 (no. 3), 61-67, 2003. (No reprints available.)

6213 Solomon, S. C., Mercury: the enigmatic innermost planet, in EPSL Frontiers, Collection 2002-2003, A. Halliday, ed., pp. 41-55, Elsevier, Amsterdam, 2004. [Reprinted from Earth Planet. Sci. Lett. 216, 441-455, 2003.] (No reprints available.)

6162 Solomon, S. C., O. Aharonson, J. M. Aurnou, W. B. Banerdt, M. H. Carr, A. J. Dombard, H. V. Frey, M. P. Golombek, S. A. Hauck, II, J. W. Head, III, B. M. Jakosky, C. L. Johnson, P. J. McGovern, G. A. Neumann, R. J. Phillips, D. E. Smith, and M. T. Zuber, New perspectives on ancient Mars, Science 307, 1214-1220, 2005.

6202 Song, I., B. Zuckerman, A. J. Weinberger, and E. E. Becklin, Extreme collisions between planetesimals as the origin of warm dust around a Sun-like star, Nature 436, 363-365, 2005. (No reprints available.)

6176 Sozzetti, A., D. W. Latham, G. Torres, R. P. Stefanik, A. P. Boss, B. W. Carney, and J. B. Laird, When do planets form? The search for extrasolar planets around metal-poor stars, in Extrasolar Planets: Today and Tomorrow, J.-P. Beaulieu, A. Lecavelier des Etangs, and C. Terquem, eds., pp. 107-108, Conference Series, Vol. 321, Astronomical Society of the Pacific, San Francisco, 2004. (No reprints available.)

6180 Sozzetti, A., D. W. Latham, G. Torres, R. P. Stefanik, A. P. Boss, B. W. Carney, and J. B. Laird, A Keck/HIRES Doppler search for planets orbiting metal-poor dwarfs, inProceedings of the Symposium "The Three-Dimensional Universe with Gaia,” C. Turon, K. S. O'Flaherty, and M. A. C. Perryman, eds., pp. 309-312, Special Publication SP-576, European Space Agency, Noordwijk, Netherlands, 2005. (No reprints available.)

6186 Taylor, S., C. M. O'D. Alexander, J. Delaney, P. Ma, G. F. Herzog, and C. Engrand, Isotopic fractionation of iron, potassium, and oxygen in stony cosmic spherules: implications for heating histories and sources, Geochim. Cosmochim. Acta 69, 2647-2662, 2005. (No reprints available.)

6163 Tinney, C. G., R. P. Butler, G. W. Marcy, H. R. A. Jones, A. J. Penny, C. McCarthy, B. D. Carter, and D. A. Fischer, Three low-mass planets from the Anglo-Australian Planet Search,Astrophys. J. 623, 1171-1179, 2005. (No reprints available.)

6182 Toporski, J., M. Fries, A. Steele, L. Nittler, and M. Kress, Sweeping the skies: Stardust and the origin of our solar system, GIT Imaging & Microscopy 04/2004, 38-40, 2004. (No reprints available.)

6164 von Braun, K., B. L. Lee, S. Seager, H. K. C. Yee, G. Mallén-Ornelas, and M. D. Gladders, Searching for planetary transits in galactic open clusters: EXPLORE/OC, Publ. Astron. Soc. Pacific 117, 141-159, 2005.

6190 Wang, Y., Y. Huang, C. M. O'D. Alexander, M. Fogel, and G. Cody, Molecular and compound-specific hydrogen isotope analyses of insoluble organic matter from different carbonaceous chondrite groups, Geochim. Cosmochim. Acta 69, 3711-3721, 2005. (No reprints available.)

6165 Warren, L. M., and P. M. Shearer, Using the effects of depth phases on P-wave spectra to determine earthquake depths, Bull. Seismol. Soc. Am. 95, 173-184, 2005.

6166 Weinberger, A. J., Planetary science: construction-site inspection, Nature 433, 114-115, 2005.

6187 Zinner, E., L. R. Nittler, P. Hoppe, R. Gallino, O. Straniero, and C. M. O'D. Alexander, Oxygen, magnesium and chromium isotopic ratios of presolar spinel grains, Geochim.Cosmochim. Acta 69, 4149-4165, 2005. (No reprints available.)