STAR FORMATION STUDIES WITH THE SLOAN DIGITAL SKY SURVEY

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The determination of timescales associated with planetary formation and circumstellar disk evolution requires large samples of stars having diverse environments and ages. Such a sample can be obtained using the Sloan Digital Sky Survey (York et al. 2000) as it is systematically mapping one-quarter of the entire sky providing photometric data on over 100 million objects in five passbands (Gunn et al. 1998, Fukugita et al. 1996). Pre main sequence stars have distinct colors in the SDSS u'g'r'i'z' photometric system as a consequence of their late-type photospheres and strong UV excess driven by the magnetospheric accretion shock. SDSS observations of ... continued below

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149 Kilobytes pages

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MCGEHEE, P. March 1, 2001.

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The determination of timescales associated with planetary formation and circumstellar disk evolution requires large samples of stars having diverse environments and ages. Such a sample can be obtained using the Sloan Digital Sky Survey (York et al. 2000) as it is systematically mapping one-quarter of the entire sky providing photometric data on over 100 million objects in five passbands (Gunn et al. 1998, Fukugita et al. 1996). Pre main sequence stars have distinct colors in the SDSS u'g'r'i'z' photometric system as a consequence of their late-type photospheres and strong UV excess driven by the magnetospheric accretion shock. SDSS observations of known Orion population emission line stars cataloged by the Kiso objective prism survey reveal a color-based signature that correlates well with the H{alpha} emission line strength. As the excess emission is a direct consequence of the presence of a circumstellar disk we can constraint the duration of the planetary formation process by determining the age of the young star. Follow-on observations of SDSS T Tauri candidates have begun at the Astrophysical Research Consortium's 3.5 meter telescope using medium resolution (R = 5000) spectroscopy. The aim is to place these objects on theoretical evolutionary tracks using spectral indicators for effective temperature and surface gravity and to create a catalog for future studies including a circumstellar disk census.

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149 Kilobytes pages

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  • Report No.: LA-UR-01-1561
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 776253
  • Archival Resource Key: ark:/67531/metadc715565

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  • March 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 23, 2016, 6:57 p.m.

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MCGEHEE, P. STAR FORMATION STUDIES WITH THE SLOAN DIGITAL SKY SURVEY, article, March 1, 2001; New Mexico. (digital.library.unt.edu/ark:/67531/metadc715565/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.