HIGH-AMPLITUDE {delta}-SCUTIS IN THE LARGE MAGELLANIC CLOUD

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/140/2/328· OSTI ID:21443280

Garg, A; Cook, K H; Nikolaev, S ^[1]; Huber, M E ^[2]; Rest, A ^[3]; Becker, A C ^[4]; Challis, P ^[5]; Clocchiatti, A; Minniti, D ^[6]; Miknaitis, G ^[7]; Morelli, L ^[8]; Olsen, K; Suntzeff, N B ^[9]; Prieto, J L ^[10]; Welch, D L ^[11]; Wood-Vasey, W M ^[12]

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1. Lawrence Livermore National Laboratory, Institute of Geophysics and Planetary Physics, 7000 East Avenue, Livermore, CA 94550 (United States)
2. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States)
3. Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138 (United States)
4. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)
5. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
6. Department of Astronomy, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 22 (Chile)
7. Center for Neighborhood Technology, 2125 W. North Avenue, Chicago, IL 60647 (United States)
8. Dipartimento di Astronomia, Universita di Padova, vicolo dell'Osservatorio 3, I-35122 Padova (Italy)
9. Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Colina el Pino s/n, Casilla 603, La Serena (Chile)
10. Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States)
11. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (Canada)
12. Department of Physics and Astronomy, University of Pittsburgh, 3951 O'Hara Street, Pittsburgh, PA 15260 (United States)

We present 2323 high-amplitude {delta}-Scuti (HADS) candidates discovered in the Large Magellanic Cloud by the SuperMACHO survey (Rest et al.). Frequency analyses of these candidates reveal that several are multimode pulsators, including 119 whose largest amplitude of pulsation is in the fundamental (F) mode and 19 whose largest amplitude of pulsation is in the first overtone (FO) mode. Using Fourier decomposition of the HADS light curves, we find that the period-luminosity (PL) relation defined by the FO pulsators does not show a clear separation from the PL relation defined by the F pulsators. This differs from other instability strip pulsators such as type c RR Lyrae. We also present evidence for a larger amplitude, subluminous population of HADS similar to that observed in Fornax.

• OSTI ID: 21443280
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 140, Issue 2; Other Information: DOI: 10.1088/0004-6256/140/2/328; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
FREQUENCY ANALYSIS
INSTABILITY
LUMINOSITY
MAGELLANIC CLOUDS
PULSATIONS
GALAXIES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES