Photometric Variability Among the Brightest Asymptotic Giant Branch Stars Near the Center of M32

Details Photometric Variability Among the Brightest Asymptotic Giant Branch Stars Near the Center of M32 Photometric Variability Among the Brightest Asymptotic Giant Branch Stars Near the Center of M32

2004-04-23

arxiv.org/abs/astro-ph/0404472v1

Astrophys.J. 607 (2004) L25-L28

Astronomy and Astrophysics

Astrophysics

8 pages of text, 3 postscript figures. ApJ (letters) in press

Scientific paper

10.1086/421771

Deep K' images with 0.1 arcsec angular resolution, obtained with ALTAIR+NIRI on Gemini North, are used to investigate photometric variablity among the brightest asymptotic giant branch (AGB) stars in the central regions of M32. Based on a comparison with brightnesses obtained from the K-band data discussed by Davidge et al. (2000, ApJ, 545, L89), it is concluded that (1) at least 60% of bright AGB stars near the center of M32 are photometrically variable, and (2) the amplitudes of the light variations are similar to those of long period variables in the Galactic bulge. We do not find evidence for a population of large amplitude variables, like those detected by IRAS in the Galactic bulge. The technique discussed here may prove useful for conducting an initial reconnaisance of photometric variability among AGB stars in spheroids in the Virgo cluster and beyond, where the required long exposure times may restrict observations to only a few epochs.

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