Correlated variability in the X-ray and Hα emission from the O4If supergiant ζ Puppis.
Abstract
The Position Sensitive Proportional Counter (PSPC) onboard the ROSAT satellite was used to monitor ζ Pup for 56651seconds spread over 11days in 1991 October. During the first 8days, 592 high-resolution Hα profiles were also obtained simultaneously. In a detailed time series analysis we investigate the X-ray observations and the Hα line profiles for variability. We find a 1.44c/d (cycles/day) modulation both in the Hα line profiles as well as in the X-ray band pass between 0.9 and 2.0keV; the amplitude of the X-ray variability amounts to +/-6%. Thus, our observations provide evidence for periodic variations in the wind density at the base of the wind of ζ Pup.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1996
- Bibcode:
- 1996A&A...306..899B
- Keywords:
-
- STARS: SUPERGIANTS;
- STARS: EARLY TYPE;
- STARS: MASS LOSS;
- X-RAYS: STARS;
- STARS: INDIVIDUAL: {ZETA} PUPPIS