Identification of 4U 1849-31 with V1223 SGR and discovery of optical pulsations.
Abstract
The X-ray source 4U 1849-31 is identified with the 13 mag star V1223 Sgr, on the basis of a precise HEAO 1 modulation collimator X-ray position uniquely selected by the Ariel-5 sky survey location. It is shown by optical spectroscopy and photometry that V1223 Sgr is a cataclysmic variable, displaying a photometric period of 13.2 min that is interpreted as being due to the rotation of a degenerate dwarf. The similarity of this system to H2252-035 is noted.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1981
- DOI:
- 10.1086/183650
- Bibcode:
- 1981ApJ...249L..21S
- Keywords:
-
- Variable Stars;
- X Ray Sources;
- Dwarf Stars;
- Optical Emission Spectroscopy;
- Sky Surveys (Astronomy);
- Spaceborne Astronomy;
- Stellar Rotation;
- Stellar Spectrophotometry;
- X Ray Astronomy;
- X Ray Spectra;
- Astronomy