12 papers · 1 filter
Recent RXTE/ASM and ROTSEIIId Observations of EXO 2030+375
A. Baykal, U. Kiziloglu, N. Kiziloglu +2
Using the archival RXTE/ASM and SWIFT/BAT observations, the new orbital phases of Type I outbursts of EXO 2030+375 are estimated. A possible correlation between the Type II outburs…
Optical observations of Be/X-ray transient system KS 1947+300
U. Kiziloglu, A. Baykal, N. Kiziloglu
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…
Evidence of a Change in the Long Term Spin-down Rate of the X-ray Pulsar 4U 1907+09
A. Baykal, S. C. Inam, E. Beklen
We analyzed RXTE archival observations of 4U 1907+09 between 17 February 1996 and 6 March 2002. The pulse timing analysis showed that the source stayed at almost {\bf{constant}} pe…
Recent Timing Studies on RXTE Observations of 4U 1538-52
A. Baykal, S. C. Inam, E. Beklen
The high mass X-ray binary pulsar 4U 1538-52 was observed between July 31 and August 7, 2003. Using these observations, we determined new orbital epochs for both circular and ellip…
ROTSE observations of the young cluster IC 348
U. Kiziloglu, N. Kiziloglu, A. Baykal
CCD observations of stars in the young cluster IC 348 were obtained from 2004 August to 2005 January with a 0.45 m ROTSEIIId robotic reflecting telescope at the Turkish National Ob…
X-ray outburst of 4U 0115+634 and ROTSE Observations of its Optical Counterpart V635 Cas
A. Baykal, U. Kiziloglu, N. Kiziloglu +2
ROTSE IIId (The Robotic Optical Transient Experiment) observations of X-ray binary system 4U 0115+634/V635 Cas obtained during 2004 June and 2005 January make possible, for the fir…