Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254...38h&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 1, 1982, p. 38-49.
Astronomy and Astrophysics
Astrophysics
51
Galactic Evolution, Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry, Magellanic Clouds, Star Clusters
Scientific paper
Color-magnitude diagrams for resolved stars in the Pegasus dwarf galaxy in the green, red, and infrared passbands of the extended Gunn photometric system are presented. The evolved nature of the upper main sequence and the lack of luminous red supergiants indicate that recent star formation in Pegasus has been very subdued. Three star clusters are identified. Their red colors indicate they are of intermediate age or older. Two features of the color-magnitude diagrams are of interest: a group of red stars with I at about 21.3, which may be the counterparts of the carbon stars found in the Magellanic Clouds, and a clump in the (I, R-I)-diagram, which is probably the tip of the old giant branch. A provisional distance estimate for Pegasus of 1.7 Mpc is derived, placing it at the outer margins of the Local Group.
Hoessel John G.
Mould Jeremy R.
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