Optical observations of the Be/X-ray transient system KS 1947+300

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Kiziloglu U., Baykal A., Kiziloglu N.

ASTRONOMISCHE NACHRICHTEN, vol.328, no.2, pp.142-145, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 328 Issue: 2
  • Publication Date: 2007
  • Doi Number: 10.1002/asna.200610647
  • Journal Name: ASTRONOMISCHE NACHRICHTEN
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.142-145
  • Middle East Technical University Affiliated: Yes

Abstract

ROTSE-IIId observations of the Be/X-ray transient system KS 1947+300 obtained between September 2004 and December 2005 make it possible to study the correlation between optical and X-ray activity. The optical outburst of 0.1 mag was accompanied by an increase of the X-ray flux in the 2004 observations. A strong correlation between the optical and X-ray light curves suggests that the neutron star directly accretes from the outflowing material of the Be star. The nearly zero time lag between X-ray and optical light curves suggests a heating of the disk of Be star by X-rays. No optical brightening and X-ray enhancement was seen in the 2005 observations. There is no indication of an orbital modulation in the optical light curve. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGA. Weinheim.