First X-ray observations of the polar CE Gru
Abstract
We report the detection of the polar CE Gru in X-rays for the first time. We find evidence for a dip seen in the hard X-ray light curve which we attribute to the accretion stream obscuring the accretion region in the lower hemisphere of the white dwarf. The X-ray spectrum can be fitted using only a shock model: there is no distinct soft X-ray component. We suggest that this is because the reprocessed component is so cool that it is shifted into the ultraviolet. We determine a mass for the white dwarf of ~1.0 Msolar.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- October 2002
- DOI:
- 10.1046/j.1365-8711.2002.05666.x
- arXiv:
- arXiv:astro-ph/0205102
- Bibcode:
- 2002MNRAS.335..918R
- Keywords:
-
- binaries: general;
- stars: individual: CE Gru;
- novae;
- cataclysmic variables;
- X-rays: stars;
- Astrophysics
- E-Print:
- Accepted for publication in MNRAS, 6 pages