Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4008s&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #40.08; Bulletin of the American Astronomical Society, Vol. 28, p.884
Astronomy and Astrophysics
Astronomy
Scientific paper
An ASCA X-ray observation of the active weak-lined T Tauri star V773 Tau was obtained over a one-day interval in September 1995. The observation caught the star in a state of high X-ray luminosity (Lx ~ 10(32.2) ergs s(-1) ) and provides new information on plasma properties and X-ray variability. The X-ray light curve shows a slow decline in count rate throughout the observation. The decline is not exponential, but is well-modeled as a sinusoid with a period of ~3.3 d. This value is consistent with previous estimates of the stellar rotation period (2.89 - 3.43 d), indicating that the X-ray emission was undergoing rotational modulation at the time of the ASCA observation. High S/N spectra from the solid-state spectrometers reveal a multi-temperature plasma dominated by a superhot component at T ~ 40 million K, and the time evolution of plasma temperature and emission measure can be tracked during the decay.
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