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Images in the rocket ultraviolet - Young clusters in H II regions of M83UV images of M83 at 1540 and 2360 A reveal 18 compact sources that are associated with H II regions. E(B - V) values were estimated individually from the observed UV and optical colors and the Galactic UV extinction curve, using theoretical flux distributions. The dereddened colors are consistent with ages up to 3 x 10 to the 6th yr. A maximum possible age of 6.5 x 10 to the 6th yr is obtained assuming foreground reddening only. The distribution of observed colors is consistent with the Galactic reddening curve but not with enhanced far-UV extinction, as in the LMC 30 Dor curve. The H-alpha fluxes suggest either that dust within the H II regions absorbs up to 70 percent of the Lyman continuum radiation or that a similar fraction of the H-alpha flux is below the surface brightness detection limit. Cluster mass estimates depend on the range of stellar masses present but are probably in the range 10,000-100,000 solar masses.
Document ID
19910027564
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bohlin, Ralph C.
(Space Telescope Science Institute Baltimore, MD, United States)
Cornett, Robert H.
(Space Telescope Science Inst. Baltimore, MD, United States)
Hill, Jesse K.
(ST Systems Corp. Lanham, MD, United States)
Stecher, Theodore P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
November 1, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 363
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A12187
Distribution Limits
Public
Copyright
Other

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