New weak-line T Tauri stars in Orion from the ROSAT all-sky survey.

Details New weak-line T Tauri stars in Orion from the ROSAT all-sky survey. New weak-line T Tauri stars in Orion from the ROSAT all-sky survey.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..119....7a&link_type=abstract

Astronomy and Astrophysics Supplement, v.119, p.7-24

Astronomy and Astrophysics

Astrophysics

99

X-Rays: Stars, Stars: Pre-Main-Sequence, Ism: Orion Star Forming Region

Scientific paper

We present results of the spectroscopic and photometric follow-up observations of the ROSAT all-sky survey in the direction of the Orion cloud complex. The main goal of these observations is the search for X-ray emitting pre-main sequence stars. 820 X-ray sources were detected with high confidence in about 450 square degrees. The mean density of X-ray sources in this region is a factor of about two higher than that of the whole RASS. 5% of the RASS sources in this region are identified with previously known and likely pre-main sequence stars. We have investigated spectroscopically 181 new RASS sources widely distributed over the entire cloud complex. On the basis of the presence of strong Li I λ6707 absorption, spectral type later than F0 and chromospheric emission, 112 new weak-line T Tauri stars could be found. We present coordinates, X-ray count-rates and finding charts of the new PMS. Optical UBV(RI)_KC_, near-infrared JHKLM and uvby-β photometry for the new WTTS is also provided. In addition 24 dKe-dMe stars were also found on the basis of the RASS data.

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