Photometry of Variable Stars From Dome A, Antarctica: Results From the 2010 Observing Season

Wang, Lingzhi; Macri, Lucas M.; Wang, Lifan; Ashley, M. C. B.; Cui, Xiangqun; Li, Feng; Gong, Xuefei; Lawrence, Jon; Liu, Qiang; Luong-Van, D.; Pennypacker, C.; Shang, Zhaohui; Storey, J. W. V.; Yang, Huigen; Yang, Ji; Yuan, Xiangyan; York, Donald G.; Xu, Zhiyong; Zhu, Zhenxi; Zhu, Zong-Hong

doi:10.1088/0004-6256/146/6/139

Cited by 44 publications

(27 citation statements)

References 40 publications

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“…Its unique location allows for continuous observations lasting longer than 24 hours during the austral winter. The continuous time coverage is important for many applications of time-domain astronomy (e.g., [32], [33] and [34]). It is equipped with a 10K×10K CCD camera in frame transfer mode that provides a field of view of 4.14 deg 2 [35].…”

Section: Instrument Observations and Data Reductionmentioning

confidence: 99%

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica

Andreoni

et al. 2017

Science Bulletin

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The LIGO detection of gravitational waves (GW) from merging black holes in 2015 marked the beginning of a new era in observational astronomy. The detection of an electromagnetic signal from a GW source is the critical next step to explore in detail the physics involved. The Antarctic Survey Telescopes (AST3), located at Dome A, Antarctica, is uniquely situated for rapid response time-domain astronomy with its continuous night-time coverage during the austral winter. We report optical observations of the GW source (GW 170817) in the nearby galaxy NGC 4993 using AST3. The data show a rapidly fading transient at around 1 day after the GW trigger, with the i-band magnitude declining from 17.23 ± 0.13 magnitude to 17.72 ± 0.09 magnitude in ∼ 1.8 hour. The brightness and time evolution of the optical transient associated with GW 170817 are broadly consistent with the predictions of models involving merging binary neutron stars. We infer from our data that the merging process ejected about ∼ 10 −2 solar mass of radioactive material at a speed of up to 30% the speed of light.

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Section: Instrument Observations and Data Reductionmentioning

confidence: 99%

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica

Andreoni

et al. 2017

Science Bulletin

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“…We employed the following four variability metrics to determine the variability of objects in the Taurus field, following the work of Wang et al (2013); Oelkers et al (2015); and Oelkers et al in prep (see Figure 2). These metrics help to identify large amplitude variability, which is not necessarily periodic.…”

Section: Variability Testingmentioning

confidence: 99%

Identification of Young Stellar Variables with KELT for K2. I. Taurus Dippers and Rotators

Rodriguez

Ansdell

Oelkers

et al. 2017

ApJ

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One of the most well-studied young stellar associations, Taurus-Auriga, was observed by the extended Kepler mission, K2, in the spring of 2017. K2 Campaign 13 (C13) is a unique opportunity to study many stars in this young association at high photometric precision and cadence. Using observations from the Kilodegree Extremely Little Telescope (KELT) survey, we identify "dippers", aperiodic and periodic variables among K2 C13 target stars. This release of the KELT data (lightcurve data in e-tables) provides the community with long-time baseline observations to assist in the understanding of the more exotic variables in the association. Transient-like phenomena on timescales of months to years are known characteristics in the light curves of young stellar objects, making contextual pre-and post-K2 observations critical to understanding their underlying processes. We are providing a comprehensive set of the KELT light curves for known Taurus-Auriga stars in K2 C13. The combined data sets from K2 and KELT should permit a broad array of investigations related to star formation, stellar variability, and protoplanetary environments.

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“…The BLS method searches for signals characterized by a periodic alternation between two discrete levels with much less time spent at the lowlevel (occultation) phase. Similar methods (LS & BLS) for hunting for variable stars, were applied in Wang et al (2011Wang et al ( , 2013a; Yao et al (2015). Surveys such as OGLE II use the Detached Eclipsing Binary Light curve fitter (Devor 2005, hereinafter DEBiL) for finding and analyzing eclipsing binaries in large datasets.…”

Section: Searching For Variabilitymentioning

confidence: 99%

Variable Stars Observed in the Galactic Disk by AST3-1 from Dome A, Antarctica

Wang

et al. 2017

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AST3-1 is the second-generation wide-field optical photometric telescope dedicated to time domain astronomy at Dome A, Antarctica. Here we present the results of i band images survey from AST3-1 towards one Galactic disk field. Based on time-series photometry of 92,583 stars, 560 variable stars were detected with i magnitude ≤ 16.5 mag during eight days of observations; 339 of these are previously unknown variables. We tentatively classify the 560 variables as 285 eclipsing binaries (EW, EB, EA), 27 pulsating variable stars (δ Scuti, γ Doradus, δ Cephei variable and RR Lyrae stars) and 248 other types of variables (unclassified periodic, multi-periodic and aperiodic variable stars). Among the eclipsing binaries, 34 show O'Connell effects. One of the aperiodic variables shows a plateau light curve and another one shows a secondary maximum after peak brightness. We also detected a complex binary system with RS CVn-like light curve morphology; this object is being followed-up spectroscopically using the Gemini South telescope.

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Photometry of Variable Stars From Dome A, Antarctica: Results From the 2010 Observing Season

Cited by 44 publications

References 40 publications

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica

Identification of Young Stellar Variables with KELT for K2. I. Taurus Dippers and Rotators

Variable Stars Observed in the Galactic Disk by AST3-1 from Dome A, Antarctica

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