High Amplitude δ-Scutis in the Large Magellanic Cloud

Details High Amplitude δ-Scutis in the Large Magellanic Cloud High Amplitude δ-Scutis in the Large Magellanic Cloud

2010-04-06

arxiv.org/abs/1004.0955v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

26 pages, 15 figures, AJ accepted

Scientific paper

We present 2323 High-Amplitude \delta-Scuti (HADS) candidates discovered in the Large Magellanic Cloud (LMC) by the SuperMACHO survey (Rest et al. 2005). 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 (Poretti et al. 2008).

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