Photometry of variable stars from Dome A, Antarctica

Lingzhi Wang, Lucas M. MacRi, Kevin Krisciunas, Lifan Wang, Michael C B Ashley, Xiangqun Cui, Long Long Feng, Xuefei Gong, Jon S. Lawrence, Qiang Liu, Daniel Luong-Van, Carl R. Pennypacker, Zhaohui Shang, John W V Storey, Huigen Yang, Ji Yang, Xiangyan Yuan, Donald G. York, Xu Zhou, Zhenxi ZhuZonghong Zhu

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Dome A on the Antarctic plateau is likely one of the best observing sites on Earth thanks to the excellent atmospheric conditions present at the site during the long polar winter night. We present high-cadence time-series aperture photometry of 10,000 stars with i < 14.5 mag located in a 23 deg2 region centered on the south celestial pole. The photometry was obtained with one of the CSTAR telescopes during 128 days of the 2008 Antarctic winter. We used this photometric data set to derive site statistics for Dome A and to search for variable stars. Thanks to the nearly uninterrupted synoptic coverage, we found six times as many variables as previous surveys with similarmagnitude limits. We detected 157 variable stars, of which 55% were unclassified, 27% were likely binaries, and 17% were likely pulsating stars. The latter category includes δ Scuti, γ Doradus, and RR Lyrae variables. One variable may be a transiting exoplanet.

Original languageEnglish
Article number155
Pages (from-to)1-13
Number of pages13
JournalAstronomical Journal
Volume142
Issue number5
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

Keywords

  • site testing
  • stars: variables: general

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