Ultraviolet photometric observations of the X-ray binary HD 153919 (3U 1700-37).
Abstract
Summary. The 06.Sf star HD 153919, the optical counterpart of the X-ray source 3U1700-37, was observed with the 5 channel ultraviolet photometer on board the ANS. The star shows a double wave light variation in all channels. The double wave variation is in phase with the optical variations in the visual spectral region, and is explained by the distorted shape of the Of star due to the presence of the X-ray companion. Significant colour variations are present below 2500 A. At phase 0.8 an absorption dip is visible in the UV light curves. This dip is confirmed by our recent uvby observations which show similar dips at phases 0.4 and 0.8. The mean ultraviolet flux distribution is normal for an O6 star. The derived reddening correction is E(B- V)=0rn.52. Key words: X-ray binaries photometry Of stars
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1977
- Bibcode:
- 1977A&A....56..433H
- Keywords:
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- Binary Stars;
- Interstellar Extinction;
- Light Curve;
- Ultraviolet Photometry;
- X Ray Sources;
- X Ray Stars;
- Early Stars;
- Line Spectra;
- Shock Fronts;
- X Ray Spectroscopy;
- Astronomy