| | |
| | |
Stat |
Members: 3643 Articles: 2'487'895 Articles rated: 2609
28 March 2024 |
|
| | | |
|
Article overview
| |
|
The Be/X-ray transient 4U 0115+63/V635 Cas: II. Outburst mechanisms | I. Negueruela
; A.T. Okazaki
; J. Fabregat
; M.J. Coe
; U. Munari
; T.Tomov
; | Date: |
12 Dec 2000 | Journal: | Astron.Astrophys. 369 (2001) 117 | Subject: | astro-ph | Affiliation: | Strasbourg), A.T. Okazaki (Hokkai-Gakuen, Cambridge), J. Fabregat (Valencia), M.J. Coe (Southampton), U. Munari, T.Tomov (Padova | Abstract: | We present multi-wavelength long-term monitoring observations of V635 Cas, the optical counterpart to the transient X-ray pulsar 4U0115+63. The evolution of emission lines and photometric magnitudes indicates that the Be star undergoes relatively fast (~ 3-5 yr) quasi-cyclic activity, losing and reforming its circumstellar disc. We show that the general optical, infrared and X-ray behaviour can be explained by the dynamical evolution of the viscous circumstellar disc around the Be star. After each disc-loss episode, the disc starts reforming and grows until it reaches the radius at which the resonant interaction of the neutron star truncates it. At some point, the disc becomes unstable to (presumably radiative) warping and then tilts and starts precessing. The tilting is very large and disc precession leads to a succession of single-peaked and shell profiles in the emission lines. Type II X-ray outbursts take place after the disc has been strongly disturbed and we speculate that the distortion of the disc leads to interaction with the orbiting neutron star. We discuss the implications of these correlated optical/X-ray variations for the different models proposed to explain the occurrence of X-ray outbursts in Be/X-ray binaries. We show that the hypothesis of mass ejection events as the cause of the spectacular variability and X-ray outbursts is unlikely to be meaningful for any Be/X-ray binary. | Source: | arXiv, astro-ph/0101208 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |