IR Monitoring of the Microquasar GRS 1915+105: Detection of Orbital and Superhump Signatures

Details IR Monitoring of the Microquasar GRS 1915+105: Detection of Orbital and Superhump Signatures IR Monitoring of the Microquasar GRS 1915+105: Detection of Orbital and Superhump Signatures

2006-10-16

arxiv.org/abs/astro-ph/0610480v2

Astrophys.J.657:409-414,2007

Astronomy and Astrophysics

Astrophysics

16 pages, 6 figures; v2: minor changes

Scientific paper

10.1086/510287

We present the results of seven years of K-band monitoring of the low-mass X-ray binary GRS 1915+105. Positive correlations between the infrared flux and the X-ray flux and X-ray hardness are demonstrated. Analysis of the frequency spectrum shows that the orbital period of the system is $P_{orb}= 30.8 \pm 0.2$ days. The phase and amplitude of the orbital modulation suggests that the modulation is due to the heating of the face of the secondary star. We also report another periodic signature between 31.2 and 31.6 days, most likely due to a superhump resonance. From the superhump period we then obtain a range on the mass ratio of the system, $0.05 < q < 0.12$.

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