Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996psu..reptq....f&link_type=abstract
Technical Report, Pennsylvania State Univ. University Park, PA United States Dept. of Astronomy and Astrophysics.
Astronomy and Astrophysics
Astronomy
Star Formation, X Ray Sources, Stellar Radiation, X Ray Astronomy, Molecular Clouds, X Ray Imagery, Rosat Mission, Emission Spectra, Metallicity
Scientific paper
Complementary soft and hard X-ray imaging observations of a nearby site of low mass star formation were made using the ROSAT and ASCA satellite observatories in order to study magnetically active young stars. The L1551 cloud in the Taurus-Auriga complex is one of the best-studied star forming regions at many wavelengths, and was the location where X-ray emitting T Tauri stars were first discovered with the Einstein Observatory. Our observation with the ROSAT PSPC detector reveal 38 faint soft X-ray sources. Since the ASCA pointing was centered on the cloud, nearly all of the sources are cloud members. For each X-ray source, we have spectral and temporal information that elucidate its astrophysical nature. 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. 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 WTT star V826 Tau. The event was preceded and followed by constant quiescent X-ray emission. The extreme CTT star XZ Tau was also caught during both high and low states.
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