Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..297w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 297-307.
Astronomy and Astrophysics
Astrophysics
58
Chromosphere, G Stars, Pre-Main Sequence Stars, Star Formation, Stellar Spectra, T Tauri Stars, X Ray Stars, Late Stars, Stellar Atmospheres, Stellar Models, Subgiant Stars
Scientific paper
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.
Brown Adrian
Carrasco Luis
Chugainov P. F.
Imhoff Catherine L.
Linsky Jeffrey L.
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