Discovery of Three New RS Canum Venaticorum--like Counterparts to HEAO 1 X-Ray Sources
Abstract
The authors report the identification of three high galactic latitude X-ray sources, detected by the HEAO 1 MC experiment, with the bright stars HD 113816, HD 146413 (= ADS 9982) and HD 39576. The authors have found all three stars to be chromospherically active by virtue of their Ca II emission strength. The latter two stars exhibit variable X-ray emission in the 1 - 13 keV energy range, while HD 113816 is a softer (0.9 - 2.5 keV) and steadier source. The optical spectroscopic observations reveal small radial velocity variations over months for HD 113816 and insignificant variations for HD 146413. The level of X-ray flux detected from these three stars is some one to two orders of magnitude higher than predicted empirically from the Ca II emission fluxes. It is proposed that the X-ray emission results from flarelike activity.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1987
- DOI:
- 10.1086/165132
- Bibcode:
- 1987ApJ...315..273B
- Keywords:
-
- Emission Spectra;
- Heao 1;
- Stellar Activity;
- X Ray Binaries;
- Chromosphere;
- Radial Velocity;
- Stellar Luminosity;
- Stellar Models;
- Stellar Spectra;
- Variable Stars;
- Astrophysics;
- CA II EMISSION;
- STARS: BINARIES;
- STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 39576;
- STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 113816;
- STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 146413;
- X-RAYS: BINARIES