Far-ultraviolet stellar photometry: A field in Orion

Details Far-ultraviolet stellar photometry: A field in Orion Far-ultraviolet stellar photometry: A field in Orion

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...89..259s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 89, no. 2, p. 259-270

Astronomy and Astrophysics

Astronomy

9

Early Stars, Open Clusters, Orion Constellation, Sky Surveys (Astronomy), Ultraviolet Photometry, White Dwarf Stars, Color-Magnitude Diagram, Data Reduction, Star Distribution, Stellar Magnitude, Stellar Spectra

Scientific paper

Far-ultraviolet photometry for 625 objects in Orion is presented. These data were extracted from electrographic camera images obtained during sounding rocket flights in 1975 and 1982. The 1975 images were centered close to the belt of Orion while the 1982 images were centered approximately 9 deg further north. One hundred and fifty stars fell in the overlapping region and were observed with both cameras. Sixty-eight percent of the objects were tentatively identified with known stars using the SIMBAD database while another 24% are blends of objects too close together to separate with our resolution. As in previous studies, the majority of the identified ultraviolet sources are early-type stars. However, there are a significant number for which no such identification was possible, and we suggest that these are interesting objects which should be further investigated. Seven stars were found which were bright in the ultraviolet but faint in the visible. We suggest that some of these are nearby white dwarfs.

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