Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-22
Mon.Not.Roy.Astron.Soc. 337 (2002) L31
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures; accepted for publication in MNRAS Letters
Scientific paper
10.1046/j.1365-8711.2002.06109.x
The first results of our ongoing near-infrared (NIR) survey of the variable red giants in the Large Magellanic Cloud, using the Infrared Survey Facility (IRSF) and the SIRIUS infrared camera, are presented. Many very red stars were detected and found that most of them are variables. In the observed colour-magnitude diagram ($J-K, K$) and the stellar $K$ magnitude distribution, the tip of the first giant branch (TRGB), where helium burning in the core starts, is clearly seen. Apart from the genuine AGB variables, we found many variable stars at luminosities around the TRGB. From this result, we infer that a substantial fraction of them are RGB variables.
Ita Yoshifusa
Kato Daisuke
Kurita Mikio
Matsunaga Noriyuki
Nagashima Chie
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