X-ray emitting T Tauri stars in the L1551 cloud

Details X-ray emitting T Tauri stars in the L1551 cloud X-ray emitting T Tauri stars in the L1551 cloud

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995psu..reptr....k&link_type=abstract

Technical Report, Pennsylvania State Univ. University Park, PA United States Dept. of Astronomy and Astrophysics.

Astronomy and Astrophysics

Astronomy

Rosat Mission, X Ray Sources, Emission Spectra, X Ray Astronomy, T Tauri Stars, Stellar Evolution, Infrared Radiation, Metallicity, Time Measurement, Stellar Mass, Brightness

Scientific paper

Low mass pre-main sequence stars in the nearby Lynds 1551 star forming 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, 2 likely new weak-lined T Tauri stars, 5 potential new weak-lined T Tauri stars, one is a young B9 star, and the remaining sources are unrelated to the cloud or poorly identified. 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. Timing analysis reveals all but one of the T Tauri stars are variable on timescales ranging from one hour to a year. A powerful flare, emitting 3 x 1034 ergs within a 40 minute rise and fall, was observed by ASCA on the weak-lined T Tauri star V826 Tau. The event was preceded and followed by constant quiescent X-ray emission. The extreme classical T Tauri star XZ Tau was also caught during both high and low states, varying by a factor of 15 between the ASCA and ROSAT observations. Neither of the luminous infrared embedded protostars L1551-IRS 5 or L1551NE were detected by ROSAT or ASCA.

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