1987•The Astrophysical JournalRequires access
X-ray sources in regions of star formation. II - The pre-main-sequence G star HDE 283572
F. M. Walter, Alexander Brown, Jeffrey L. Linsky, A. E. Rydgren, F. Vrba, M. Roth, L. Carrasco, P. F. Chugainov, N. I. Shakovskaya, C. L. Imhoff
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Abstract
This paper reports the detection of HDE 283572, a ninth-magnitude G star 8 arcmin south of RY Tau, as a bright X-ray source. The observations reveal this object to be a fairly massive (about 2 solar masses) pre-main-sequence star associated with the Taurus-Auriga star formation complex. It exhibits few of the characteristics of the classical T Tauri stars and is a good example of a 'naked' T Tauri star. The star is a mid-G subgiant, of about three solar radii and rotates with a period of 1.5 d. The coronal and chromospheric surface fluxes are similar to those of the most active late type stars (excluding T Tauri stars). The X-ray and UV lines most likely arise in different atmospheric structures. Radiative losses are some 1000 times the quiet solar value and compare favorably with those of T Tauri stars.