|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
X-Ray and Optical Observations of A 0535+26 | | A. Camero-Arranz
; M. H. Finger
; C. A. Wilson-Hodge
; P. Jenke
; I. Steele
; M. J. Coe
; J. Gutierrez-Soto
; P. Kretschmar
; I. Caballero
; G. Case
; M. L. Cherry
; J. Yan
; J. Suso
; J. Rodríguez
; S. Guiriec
; V. A. McBride
; | | Date: |
19 Sep 2011 | | Abstract: | We present recent contemporaneous X-ray and optical observations of the
Be/X-ray binary system A 0535+26 with the Fermi/Gamma-ray Burst Monitor (GBM)
and several ground-based observatories. These new observations are put into the
context of the rich historical data and discussed in terms of the neutron star
Be-disk interaction. The Be circumstellar disk was exceptionally large just
before the 2009 December giant outburst, which may explain the origin of the
unusual recent X-ray activity of this source. We found a peculiar evolution of
the pulse profile during this giant outburst, with the two main components
evolving in opposite ways with energy. A hard 30-70 mHz X-ray QPO was detected
with GBM during this 2009 December giant outburst. It becomes stronger with
increasing energy and disappears at energies below 25 keV. In the long-term a
strong optical/X-ray correlation was found for this system, however in the
medium-term the H{alpha} EW and the V-band brightness showed an
anti-correlation after sim2002 August. Each giant X-ray outburst occurred
during a decline phase of the optical brightness, while the H{alpha} showed a
strong emission. In late 2010 and before the 2011 February outburst, rapid V/R
variations are observed in the strength of the two peaks of the H{alpha} line.
These had a period of sim25 days and we suggest the presence of a global
one-armed oscillation to explain this scenario. A general pattern might be
inferred, where the disk becomes weaker and shows V/R variability beginning
sim6 months following a giant outburst. | | Source: | arXiv, 1109.3924 | | 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 Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER