HST WFPC2 Observations of the M31 Nucleus and the M31 Globular Cluster G1

Details HST WFPC2 Observations of the M31 Nucleus and the M31 Globular Cluster G1 HST WFPC2 Observations of the M31 Nucleus and the M31 Globular Cluster G1

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7608r&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #76.08; Bulletin of the American Astronomical Society, Vol. 26, p.1434

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present new Cycle 4 images of the brightest globular cluster, M31 G1=Mayall II. The I, V-I color-magnitude digram has a giant branch that falls on the locus of 47 Tuc, and a very red horizontal branch that is at our detection limit, at V=25.2; adopting a modulus of 24.4 mag, M_V(HB)=+0.8. While at the limit of detection, the horizontal branch is as red as the giant branch. We also present Cycle 4 images of the M31 nucleus in the F1042M filter. The double morphology is identical to that reported by Lauer et al. [(1993) AJ 106, 1436]. Restored WFPC1 images [Rich, Mighell & Neill, 1994 in preparation] show no change in morphology from 4400 Angstroms to 8500 Angstroms. These observations serve to further confirm that the peculiar morphology is not due to absorption by dust.

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