IUE observations of X-ray sources : HD 153919 (4U 1700-37), HDE 226868(Cyg X-1), HZ HER (Her X-1).
Abstract
The first UV spectroscopic measurements of binary X-ray sources with IUE show highly variable emission from a photoionized plasma in the object HZ Her, and give evidence for localized circumsystem material in the binary source Cygnus X-1. In addition, a substantial stellar wind is found in one of the brightest identified X-ray sources HD153919. This system may be surrounded by an extensive H II region unusual in its content of high excitation ion species.
- Publication:
-
Nature
- Pub Date:
- October 1978
- DOI:
- 10.1038/275400a0
- Bibcode:
- 1978Natur.275..400D
- Keywords:
-
- Binary Stars;
- Interstellar Matter;
- Iue;
- Stellar Spectra;
- Ultraviolet Spectroscopy;
- X Ray Sources;
- Absorption Spectra;
- Abundance;
- Eclipsing Binary Stars;
- H Ii Regions;
- Lyman Alpha Radiation;
- Photoionization;
- Spectral Resolution;
- Stellar Envelopes;
- Stellar Winds;
- Astrophysics;
- BINARY STARS;
- INTERSTELLAR MATTER;
- IUE;
- STELLAR SPECTRA;
- ULTRAVIOLET SPECTROSCOPY;
- X RAY SOURCES;
- ABSORPTION SPECTRA;
- ABUNDANCE;
- ECLIPSING BINARY STARS;
- H II REGIONS;
- LYMAN ALPHA RADIATION;
- PHOTOIONIZATION;
- SPECTRAL RESOLUTION;
- STELLAR ENVELOPES;
- STELLAR WINDS