A search for coronal emission lines in HD 153919 (3U 1700-37).
Abstract
Low-noise Reticon spectra of HD 153919, which is identified with the X-ray source 3U 1700-37, do not show the 5303-A forbidden Fe XIV emission line previously reported by Dupree et al. (1977). The new spectra provides an upper limit to the central intensity of a forbidden Fe XIV line which is at least a factor of 6 below the intensity reported by Dupree et al. A variation in the forbidden Fe XIV emission-line flux could occur if the X-ray flux were variable on a time scale of years.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1979
- DOI:
- 10.1086/182898
- Bibcode:
- 1979ApJ...228L..37L
- Keywords:
-
- Astronomical Spectroscopy;
- Eclipsing Binary Stars;
- Iron;
- Line Spectra;
- O Stars;
- Optical Emission Spectroscopy;
- X Ray Sources;
- Absorption Spectra;
- Emission Spectra;
- Helium Atoms;
- Hydrogen Atoms;
- Radial Velocity;
- Radiant Flux Density;
- Spectral Line Width;
- Stellar Coronas;
- Ultraviolet Spectroscopy;
- Astrophysics;
- Emission Lines:Of Stars;
- Of Stars:X-Ray Binaries