High Amplitude \delta-Scutis in the Large Magellanic Cloud
Abstract
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).
Keywords
Cite
@article{arxiv.1004.0955,
title = {High Amplitude \delta-Scutis in the Large Magellanic Cloud},
author = {A. Garg and K. H. Cook and S. Nikolaev and M. E. Huber and A. Rest and A. C. Becker and P. Challis and A. Clocchiatti and G. Miknaitis and D. Minniti and L. Morelli and K. Olsen and J. L. Prieto and N. B. Suntzeff and D. L. Welch and W. M. Wood-Vasey},
journal= {arXiv preprint arXiv:1004.0955},
year = {2015}
}
Comments
26 pages, 15 figures, AJ accepted