تقرير
Stellar Variability and Flare Rates from Dome A, Antarctica using 2009 and 2010 CSTAR Observations
| العنوان: | Stellar Variability and Flare Rates from Dome A, Antarctica using 2009 and 2010 CSTAR Observations |
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| المؤلفون: | Oelkers, Ryan J., Macri, Lucas M., Wang, Lifan, Ashley, Michael C. B., Cui, Xiangqun, Feng, Long-Long, Gong, Xuefei, Lawrence, Jon S., Qiang, Liu, Luong-Van, Daniel, Pennypacker, Carl R., Yuan, Xiangyan, York, Donald G., Zhou, Xu, Zhu, Zhenxi |
| سنة النشر: | 2016 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | The Chinese Small Telescope ARray (CSTAR) carried out high-cadence time-series observations of 20.1 square degrees centered on the South Celestial Pole during the 2008, 2009 & 2010 winter seasons from Dome A in Antarctica. The nearly-continuous 6 months of dark conditions during each observing season allowed for >10^6 images to be collected through gri and clear filters, resulting in the detection of >10^4 sources over the course of 3 years of operation. The nearly space-like conditions in the Antarctic plateau are an ideal testbed for the suitability of very small-aperture (<20 cm) telescopes to detect transient events, variable stars and stellar flares. We present the results of a robust search for such objects using difference image analysis of the data obtained during the 2009 & 2010 winter seasons. While no transients were found, we detected 29 flaring events and find a normalized flaring rate of 5+\-4x10^-7 flare/hour for late-K dwarfs, 1+\-1x10^-6 flare/hour for M dwarfs and 7+\-1x10^-7 flare/hour for all other stars in our sample. We suggest future small-aperture telescopes planned for deployment at Dome A would benefit from a tracking mechanism, to help alleviate effects from ghosting, and a finer pixel scale, to increase the telescope's sensitivity to faint objects. We find that the light curves of non-transient sources have excellent photometric qualities once corrected for systematics, and are limited only by photon noise and atmospheric scintillation. Comment: Accepted for Publication in the Astronomical Journal, 14 pages, 12 figures and 2 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/0004-6256/151/6/166 |
| URL الوصول: | http://arxiv.org/abs/1603.09699 |
| رقم الأكسشن: | edsarx.1603.09699 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/0004-6256/151/6/166 |
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