X-ray Emitting Young Stars in the L1551 Cloud
Abstract
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.
- Publication:
-
American Astronomical Society Meeting Abstracts #186
- Pub Date:
- May 1995
- Bibcode:
- 1995AAS...186.0905C