Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..194w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 194-201.
Astronomy and Astrophysics
Astronomy
49
Astronomical Photometry, Astronomical Spectroscopy, Pre-Main Sequence Stars, T Tauri Stars, Variable Stars, X Ray Astronomy, Heao 2, Light Curve, Stellar Flares, Stellar Spectra
Scientific paper
Follow-up Einstein X-ray observations of four fields containing pre-main-sequence stars are presented. A search has been made for evidence of variability on time scales of hours and of 1 year. A large, slow flare in AS 205, and the X-ray disappearance of AA Tau are reported. Otherwise, T Tauri stars appear no more variable in X-rays than do active solar-like stars. An attempt has been made to determine spectral parameters for a number of the brighter sources. X-ray absorption column densities are consistent with those inferred from A(v), and T(x) of about 10-million K, in all cases. The importance of these observations for models of T Tauri stars and their coronae is considered.
Kuhi Leonard V.
Walter Fred M.
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