UIT: Ultraviolet observations of the small Magellanic cloud

Details UIT: Ultraviolet observations of the small Magellanic cloud UIT: Ultraviolet observations of the small Magellanic cloud

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430l.117c&link_type=abstract

The Astrophysical Journal, vol. 430, no. 2, pt. 2, p. L117-L120

Astronomy and Astrophysics

Astrophysics

10

Interstellar Extinction, Magellanic Clouds, Stellar Mass, Ultraviolet Emission, Astronomical Photography, Far Ultraviolet Radiation, Metallicity, Near Ultraviolet Radiation, Stellar Spectrophotometry

Scientific paper

Ultraviolet Imaging Telescope (UIT) far-ultraviolet (FUV) and near-ultraviolet (NUV) images are presented for a 40' field at the southwest end of the SMC centered near the H alpha emission object Henize 19. Photometry is obtained for 1309 stars common to the FUV (lambda eff = 1620 A) and NUV (lambda eff = 2490 A) images. We use UIT photometry and imagery to derive a UV color-magnitude diagram for hot field stars; confirm the consistency of low-metal-abundance stellar evolutionary models with the observations; study dust distribution in the field, finding an increase in E(B--V) from the northeast to the southwest; confirm for a large number of stars an extinction curve, like that derived by Hutchings for the SMC, which rises steeply from NUV to FUV; and derive a mass function for SMC field stars and its lack of dependence on assumed extinction curve characteristics. The mass function has a slope within the accepted range (Gamma = -1.7 +/- 0.5) over a wide range of assumed extinction parameters, including variations of the size (+/- approximately 1.5 mag x E(B--V) in the FUV) seen in the Galaxy.

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