Far-ultraviolet stellar photometry: Fields in Sagittarius and Scorpius

Details Far-ultraviolet stellar photometry: Fields in Sagittarius and Scorpius Far-ultraviolet stellar photometry: Fields in Sagittarius and Scorpius

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apjs...96..605s&link_type=abstract

The Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 96, no. 2, p. 605-626

Astronomy and Astrophysics

Astronomy

5

Early Stars, Far Ultraviolet Radiation, Sagittarius Constellation, Scorpius Constellation, Sky Surveys (Astronomy), Ultraviolet Photometry, Astronomical Photometry, Iue, Multispectral Band Cameras, Space Shuttle Missions

Scientific paper

Far-ultraviolet photometry for 741 objects in a field in Sagittarius centered near M8 and 541 objects in a field centered near sigma Scorpii is presented. These data were extracted from electographic images obtained with two cameras during a shuttle flight in 1991 April/May. The cameras provided band passes with lambdaeff = 1375 A and lambdaeff = 1781 A. Synthetic colors show that these bands are sensitive to effective temperature for hot stars. Our measurements were placed on a quantitative far-ultraviolet magnitude scale by convolving the spectra of stars observed by IUE with our cameras' spectral response functions. Fifty-eight percent of the ultraviolet objects were identified with visible stars using the SIMBAD database while another 40% of the objects are blends of early type stars too close together to separate with our resolution. Our photometry is compared with that from the TD-1, OAO 2, and ANS satellites and the S201 (Apollo 16) far-ultraviolet camera and found to agree at the level of a few tenths of a magnitude. Unlike previous studies, almost half of the identified visual counterparts to the ultraviolet objects are early B stars. A plot of distance modulus against ultraviolet color excess reveals a significant population of stars with strong ultraviolet excess.

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