Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l..35k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 1, p. L35-L38.
Astronomy and Astrophysics
Astronomy
51
Asymptotic Giant Branch Stars, Elliptical Galaxies, Faint Objects, Hubble Space Telescope, Planetary Nebulae, Ultraviolet Astronomy, Astronomical Maps, Astronomical Spectroscopy, Galactic Nuclei, Star Distribution, Stellar Evolution
Scientific paper
A 5161 s exposure was taken with the FOC on the central 44 arcsec of M31, through a filter centered at 1750 A. Much of the light is red-leak from visible wavelengths, but nearly half of it is genuine UV. The image shows the same central peak found earlier by Stratoscope, with a somewhat steeper dropoff outside that peak. More than 100 individual objects are seen, some pointlike and some slightly extended. We identify them as post-asymptotic giant branch stars, some of them surrounded by a contribution from their accompanying planetary nebulae. These objects contribute almost a fifth of the total UV light, but fall far short of accounting for all of it. We suggest that the remainder may result from the corresponding evolutionary tracks in a population more metal-rich than solar.
Albrecht Roland
Barbieri Carlo
Baxter D.
Blades Chris J.
Boksenberg Alec
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