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Red variables in the OGLE-II database: first results for the LMC

Published online by Cambridge University Press:  12 April 2016

L.L. Kiss
Affiliation:
School of Physics, University of Sydney, NSW 2006, Australia
T.R. Bedding
Affiliation:
School of Physics, University of Sydney, NSW 2006, Australia
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Abstract

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We present a period analysis of more then 23 000 red giants in the Large Magellanic Cloud observed by the OGLE-II microlensing project. Periods combined with the single-epoch 2MASS J H K S magnitudes revealed the complex distributions of stars in the period-luminosity plane. Besides four different sequences corresponding to different modes of pulsation in AGB stars, we also discovered two distinct and well-separated sequences below the tip of the Red Giant Branch, consisting of almost 10000 short-period and low-amplitude red variable stars. We propose that the majority are likely to be first ascent red giants, showing radial pulsations in the second and third overtone modes.

Type
Part 2. What variable stars tell us about the Local Group, including the distance scale
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

Cioni, M.-R.L., et al. 2000 A&A, 359, 601 Google Scholar
Ita, Y., et al. 2002 MNRAS, 337, L31 CrossRefGoogle Scholar
Kiss, L.L., Bedding, T.R. 2003 MNRAS, 343, L79 CrossRefGoogle Scholar
Udalski, A., Kubiak, M., Szymanski, M. 1997 Acta Astron., 47, 319 Google Scholar
Wood, P.R. 2000 PASA, 17, 18 CrossRefGoogle Scholar
Zebrun, K., et al. 2001 Acta Astron., 51, 317 Google Scholar
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Red variables in the OGLE-II database: first results for the LMC
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