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

  • L.L. Kiss (a1) and T.R. Bedding (a1)

Abstract

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.

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References

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Cioni, M.-R.L., et al. 2000 A&A, 359, 601
Ita, Y., et al. 2002 MNRAS, 337, L31
Kiss, L.L., Bedding, T.R. 2003 MNRAS, 343, L79
Udalski, A., Kubiak, M., Szymanski, M. 1997 Acta Astron., 47, 319
Wood, P.R. 2000 PASA, 17, 18
Zebrun, K., et al. 2001 Acta Astron., 51, 317

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

  • L.L. Kiss (a1) and T.R. Bedding (a1)

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