Ultraviolet Imaging Telescope photometry of massive stars - The OB association NGC 206 in M31

Details Ultraviolet Imaging Telescope photometry of massive stars - The OB association NGC 206 in M31 Ultraviolet Imaging Telescope photometry of massive stars - The OB association NGC 206 in M31

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..33h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 1, p. L33-L35.

Astronomy and Astrophysics

Astrophysics

11

B Stars, Massive Stars, O Stars, Stellar Spectrophotometry, Ultraviolet Telescopes, Color-Magnitude Diagram, Stellar Evolution, Stellar Spectra, Supergiant Stars

Scientific paper

The Ultraviolet Imaging Telescope (UIT) obtained UV images of the giant M31 OB association NGC 206. Magnitudes in bands at 1520 and 2490 A were obtained for 30 massive stars, which demonstrate the effectiveness of UIT for photometry of moderately crowded hot stars to V about 21. The UV colors and magnitudes observed for stars in NGC 206 place them in the region of the color magnitude diagram occupied by evolutionary models for 30-60 solar mass stars, after correcting for extinction. The brighter stars are systematically redder than the fainter stars, indicating that they are supergiants of age about 4 Myr, while the fainter, bluer stars are nearer age zero. The relative numbers of probable supergiants measured by us and the number of probable main-sequence O stars measured from optical images are in agreement with the relative lifetimes. Calculated UIT colors are presented for a library of standard star spectra constructed from IUE and ground-based observations.

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