X-Ray Sources in Regions of Star Formation. II. The Pre--Main-Sequence G Star HDE 283572
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1987
- DOI:
- 10.1086/165059
- Bibcode:
- 1987ApJ...314..297W
- Keywords:
-
- 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;
- Astrophysics;
- STARS: CHROMOSPHERES;
- STARS: FORMATION;
- STARS: INDIVIDUAL HENRY DRAPER NUMBER: HDE 283572;
- STARS: PRE--MAIN-SEQUENCE;
- STARS: X-RAYS