Carbon Star Survey in the Local Group. VI. The Dwarf Spheroidal Galaxy NGC 205

Details Carbon Star Survey in the Local Group. VI. The Dwarf Spheroidal Galaxy NGC 205 Carbon Star Survey in the Local Group. VI. The Dwarf Spheroidal Galaxy NGC 205

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....125.3037d&link_type=abstract

The Astronomical Journal, Volume 125, Issue 6, pp. 3037-3045.

Astronomy and Astrophysics

Astronomy

20

Galaxies: Individual: Ngc Number: Ngc 205, Galaxies: Stellar Content, Galaxies: Structure, Stars: Carbon

Scientific paper

We present a CFH12K survey of the carbon stars in NGC 205 and its surrounding field. We find that the number of C stars in NGC 205 is low (~500) for its luminosity and that very few C stars are seen outside of the 10' isophote, suggesting tidal stripping by M31. Their =-4.54, a magnitude nearly identical to what has been found in other galaxies with numerous C stars. Stars with accurate (R-I) photometry, to I~22.5, are used to determine the outer profile of NGC 205. A King profile with rt=19.77′+/-3.00′ fits the data for distances larger than 7'. This rt implies that NGC 205 reached a minimum distance to M31 of ~42 kpc. The spatial distribution of C stars in the surrounding field reveals that some C stars belong to to the disk of M31, seen in projection, and that a surplus of C stars seen west of NGC 205 could be part of tidal debris left along its orbit. Finally, we report evidence of a transient period of enhanced star formation that occurred 1-2 Gyr ago in the northwest half of NGC 205.

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