GX 17+2 K波段增亮的可能周期
A Possible Period for the K-band Brightening Episodes of GX 17+2
摘要：
低质量X射线双星和Z源GX 17+2经历了至少3.5等的红外K波段增亮事件。这些事件的来源尚不清楚。先前公布的K波段震级和2006年至2008年期间获得的新K波段测量结果表明，这些事件至少持续4小时，周期为3.01254 $\pm$ 0.00002天。未来的明亮事件可以用星历表JD_{max}（n）= 2454550.79829 +（3.01254 $\pm$ 0.00002）（n）天来预测。越来越多的证据表明，GX 17+2可能有一个同步加速器喷流，这可能导致这种活动。
英文摘要：
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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