Discovering new weak-line T Tauri stars in Taurus-Auriga with the ROSAT All-Sky Survey

Details Discovering new weak-line T Tauri stars in Taurus-Auriga with the ROSAT All-Sky Survey Discovering new weak-line T Tauri stars in Taurus-Auriga with the ROSAT All-Sky Survey

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295l...5n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 1, p. L5-L8

Astronomy and Astrophysics

Astronomy

49

All Sky Photography, Auriga Constellation, Line Spectra, Rosat Mission, Sky Surveys (Astronomy), T Tauri Stars, Taurus Constellation, Color-Color Diagram, Emission Spectra, Star Formation, X Ray Astronomy, X Ray Stars

Scientific paper

We analyze ROSAT All-Sky Survey (RASS) observations of an approximately 103 deg squared area including the Taurus-Auriga star forming region and its surroundings. The sample of low-mass pre-main sequence stars detected with the spatially complete flux-limited RASS consists mainly of weak-emission line T Tauri stars (WTTS). Two thirds of all RASS X-ray sources cannot be identitifed with known stellar or extragalactic counterparts. Based on the fraction of spectroscopically identified WTTS among a sample of previously unidentified RASS sources, we extrapolate a lower limit for the total number of WTTS in and around Taurus-Auriga: WTTS outnumber classical TTS by at least a factor of 8. A selection criterion for WTTS candidates is established based on the low-resolution X-ray spectra of identified WTTS. We achieve a selection reliability of 54%.

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