Discovery of multiple pulsations in the new δ Scuti star HD 92277: Asteroseismology from Dome A, Antarctica

Journal Article · Sun Feb 01 00:00:00 EST 2015 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/149/2/84· OSTI ID:22342096

Zong, Weikai; Fu, Jian-Ning; Niu, Jia-Shu; Zhu, Zonghong ^[1]; Charpinet, S.; Vauclair, G. ^[2]; Ashley, Michael C. B.; Lawrence, Jon S.; Luong-Van, Daniel ^[3]; Cui, Xiangqun; Gong, Xuefei ^[4]; Feng, Longlong; Wang, Lifan; Yuan, Xiangyan; Zhu, Zhenxi ^[5]; Liu, Qiang; Wang, Lingzhi; Zhou, Xu ^[6]; Pennypacker, Carl R. ^[7]

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1. Department of Astronomy, Beijing Normal University, Beijing 100875 (China)
2. Université de Toulouse, UPS-OMP, IRAP, F-31400 Toulouse (France)
3. School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
4. Nanjing Institute of Astronomical Optics and Technology, Nanjing 210042 (China)
5. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
6. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
7. Center for Astrophysics, Lawrence Berkeley National Laboratory, Berkeley, CA (United States)

We report the discovery of low-amplitude oscillations in the star HD 92277 from long, continuous observations in the r and g bands using the CSTAR telescopes in Antarctica. A total of more than 1950 hours of high-quality light curves were used to categorize HD 92277 as a new member of the δ Scuti class. We have detected 21 (20 frequencies are independent and one is the linear combination) and 14 (13 frequencies are independent and one is the linear combination) pulsation frequencies in the r and g bands, respectively, indicating a multi-periodic pulsation behavior. The primary frequency f{sub 1} = 10.810 days{sup −1} corresponds to a period of 0.0925 days and is an l = 1 mode. We estimate a B − V index of 0.39 and derive an effective temperature of 6800 K for HD 92277. We conclude that long, continuous and uninterrupted time-series photometry can be performed from Dome A, Antarctica, and that this is especially valuable for asteroseismology where multi-color observations (often not available from space-based telescopes) assist with mode identification.

• OSTI ID: 22342096
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 149, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMPLITUDES
ANTARCTICA
COLOR
DATA
OSCILLATIONS
PERIODICITY
PHOTOMETRY
PULSATIONS
SPACE
STARS
TELESCOPES
VISIBLE RADIATION