X-ray Emitting Young Stars in the L1551 Cloud

Details X-ray Emitting Young Stars in the L1551 Cloud X-ray Emitting Young Stars in the L1551 Cloud

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.0905c&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #09.05; Bulletin of the American Astronomical Society, Vol. 27, p.824

Astronomy and Astrophysics

Astronomy

Scientific paper

Low mass pre-main sequence stars in the nearby Lynds 1551 star forming cloud cloud are studied with the ROSAT and ASCA X-ray satellites. An 8 ksec ROSAT image reveals 38 sources including 7 well-known T Tauri stars, 14 potential new weak-lined T Tauri stars, 16 X-ray emitting stars unrelated to the cloud, and an active B9 star. A 40 ksec ASCA image of the cloud detects seven of the ROSAT sources. Spectral fitting of the brighter X-ray emitting stars suggests the emission is produced in either a multi-temperature plasma, with temperatures near 0.2 and 1 keV, or a single-temperature plasma with low metal abundances. XZ Tau, a young classical T Tauri star, is much stronger in ASCA than ROSAT observations showing a harder (1.5-2.0 kev) component. Eleven ROSAT sources exhibit variability of up to a factor of two on timescales of hours. A powerful flare, with total energy around 3 times 10(34) ergs, is observed by ASCA on the weak-lined T Tauri star V826 Tau.

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