A Survey of Compact Star Clusters in the South-West Field of the M 31 Disk

Details A Survey of Compact Star Clusters in the South-West Field of the M 31 Disk A Survey of Compact Star Clusters in the South-West Field of the M 31 Disk

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56.1025k&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.6, pp. 1025-1040

Astronomy and Astrophysics

Astronomy

12

Emission Nebulae: General, Galaxies: Individual (M31), Galaxies: Photometry, Galaxies: Star Cluster, Globular Clusters: General, Open Clusters: General

Scientific paper

A survey for compact clusters with a dimension of 10pc order was conducted in an area of about 500 square arc-minutes of the south-west part of the M31 disk, making use of the high-resolution capability of Suprime-Cam. Photometry in the B, V, and R broad-bands, and in the R* medium-band centered around Hα with varying apertures was carried out for about 1200 targets, which are related to about 300 compact objects detected in the survey. The results for 101 prominent compact objects are presented as photometric catalogues and morphological atlases, separately for samples with and without strong Hα emission. Many of the compact objects, which were previously suspected to be globular cluster candidates, are judged to be open clusters based upon their internal structures of sub-arc-second order. The majority of the 49 listed compact non-emission objects, which are restricted to be brighter than MV ˜ -5, have colors of 0 < B - V < 1.0, indicating their nature of massive evolved clusters. In contrast, only about 10% of the 52 listed compact emission objects are brighter than MiV ˜ -5, probably reflecting the short period of the emission phase and the substantial effects of the circum-stellar extinction. The detection of a few candidates of background galaxies is also reported.

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