A Possible Period for the K-band Brightening Episodes of GX 17+2

Details A Possible Period for the K-band Brightening Episodes of GX 17+2 A Possible Period for the K-band Brightening Episodes of GX 17+2

2009-07-24

arxiv.org/abs/0907.4348v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 2 figures; to be published in ApJ Letters

Scientific paper

The low mass X-ray binary and Z source GX 17+2 undergoes infrared K-band brightening episodes of at least 3.5 magnitudes. The source of these episodes is not known. Prior published K-band magnitudes and new K-band measurements acquired between 2006 and 2008 suggest that the episodes last at least 4 hours and have a period of 3.01254 $\pm$ 0.00002 days. Future bright episodes can be predicted using the ephemeris JD_{max} (n) = 2454550.79829 + (3.01254 $\pm$ 0.00002)(n) days. A growing body of evidence suggests that the GX 17+2 could have a synchrotron jet, which could cause this activity.

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