کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487787 | 1523722 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
WZ Sge: An eclipsing cataclysmic variable evolving towards the period minimum
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We present the photometric results of the eclipsing cataclysmic variable (CV) WZ Sge near the period minimum (Pminâ). Eight new mid-eclipse times were determined and the orbital ephemeris was updated. Our result shows that the orbital period of WZ Sge is decreasing at a rate of PË=â2.72(±0.23)Ã10â13ssâ1. This secular decrease, coupled with previous detection of its donor, suggest that WZ Sge is a pre-bounce system. Further analysis indicates that the observed period decrease rate is about 1.53 times higher than pure gravitational radiation (GR) driving. We constructed the evolutionary track of WZ Sge, which predicts that Pminâ of WZ Sge is â¼ 77.98( ± 0.90) min. If the orbital period decreases at the current rate, WZ Sge will evolve past its Pminâ after â¼ 25.3 Myr. Based on the period evolution equation we find MË2â4.04(±0.10)Ã10â11Mâyrâ1, which is compatible with the current concept of CV evolution at ultrashort orbital periods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 56, October 2017, Pages 22-27
Journal: New Astronomy - Volume 56, October 2017, Pages 22-27
نویسندگان
Z.-T. Han, S.-B. Qian, Irina Voloshina, L.-Y. Zhu,