The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
J. Krzesinski - One of the best experts on this subject based on the ideXlab platform.
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an Initial Survey of white dwarfs in the sloan digital sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, M StraussAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs (WDs) and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and five hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12,000 K, and the density of these stars for 15 < g < 20 is found to be ~2.2 deg-2 at Galactic latitudes of 29°–62°. Spectra are obtained for roughly half of these hot stars. The spectra show that for 15 < g < 17, 40% of hot stars are WDs, and the fraction of WDs rises to ~90% at g = 20. The remainder are hot sdB and sdO stars.
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An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, Michael A. Strauss, D. E. Vanden BerkAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and 5 hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C_2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12000 K, and the density of these stars for 15
H. C. Harris - One of the best experts on this subject based on the ideXlab platform.
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an Initial Survey of white dwarfs in the sloan digital sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, M StraussAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs (WDs) and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and five hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12,000 K, and the density of these stars for 15 < g < 20 is found to be ~2.2 deg-2 at Galactic latitudes of 29°–62°. Spectra are obtained for roughly half of these hot stars. The spectra show that for 15 < g < 17, 40% of hot stars are WDs, and the fraction of WDs rises to ~90% at g = 20. The remainder are hot sdB and sdO stars.
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An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, Michael A. Strauss, D. E. Vanden BerkAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and 5 hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C_2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12000 K, and the density of these stars for 15
D. E. Vanden Berk - One of the best experts on this subject based on the ideXlab platform.
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An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, Michael A. Strauss, D. E. Vanden BerkAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and 5 hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C_2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12000 K, and the density of these stars for 15
M Strauss - One of the best experts on this subject based on the ideXlab platform.
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an Initial Survey of white dwarfs in the sloan digital sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, M StraussAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs (WDs) and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and five hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12,000 K, and the density of these stars for 15 < g < 20 is found to be ~2.2 deg-2 at Galactic latitudes of 29°–62°. Spectra are obtained for roughly half of these hot stars. The spectra show that for 15 < g < 17, 40% of hot stars are WDs, and the fraction of WDs rises to ~90% at g = 20. The remainder are hot sdB and sdO stars.
Gillian R. Knapp - One of the best experts on this subject based on the ideXlab platform.
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an Initial Survey of white dwarfs in the sloan digital sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, M StraussAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs (WDs) and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and five hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12,000 K, and the density of these stars for 15 < g < 20 is found to be ~2.2 deg-2 at Galactic latitudes of 29°–62°. Spectra are obtained for roughly half of these hot stars. The spectra show that for 15 < g < 17, 40% of hot stars are WDs, and the fraction of WDs rises to ~90% at g = 20. The remainder are hot sdB and sdO stars.
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An Initial Survey of White Dwarfs in the Sloan Digital Sky Survey
The Astronomical Journal, 2003Co-Authors: H. C. Harris, J. Liebert, S. J. Kleinman, Atsuko Nitta, S. F. Anderson, Gillian R. Knapp, J. Krzesinski, Gary D. Schmidt, Michael A. Strauss, D. E. Vanden BerkAbstract:An Initial assessment is made of white dwarf and hot subdwarf stars observed in the Sloan Digital Sky Survey. In a small area of sky (190 square degrees), observed much like the full Survey will be, 269 white dwarfs and 56 hot subdwarfs are identified spectroscopically where only 44 white dwarfs and 5 hot subdwarfs were known previously. Most are ordinary DA (hydrogen atmosphere) and DB (helium) types. In addition, in the full Survey to date, a number of WDs have been found with uncommon spectral types. Among these are blue DQ stars displaying lines of atomic carbon; red DQ stars showing molecular bands of C_2 with a wide variety of strengths; DZ stars where Ca and occasionally Mg, Na, and/or Fe lines are detected; and magnetic WDs with a wide range of magnetic field strengths in DA, DB, DQ, and (probably) DZ spectral types. Photometry alone allows identification of stars hotter than 12000 K, and the density of these stars for 15
