The EUVE Optical Identification Campaign II: Late-Type and White Dwarf Stars

Details The EUVE Optical Identification Campaign II: Late-Type and White Dwarf Stars The EUVE Optical Identification Campaign II: Late-Type and White Dwarf Stars

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1304c&link_type=abstract

Astronomical Journal v.110, p.1304

Astronomy and Astrophysics

Astronomy

9

Stars: Late-Type, White Dwarfs, Ultraviolet: Stars

Scientific paper

We present optical identifications of nine previously unidentified extreme ultraviolet (EUV) sources discovered during the Extreme Ultraviolet Explorer (EUVE) satellite surveys. The all-sky survey detected four of the sources and the more sensitive deep survey detected the other five sources. Three of the four all-sky survey sources, EUVE_J1918+599, EUVE_J2249+585, and EUVE_J2329+414, are listed in present catalogs as having possible associations with optical counterparts but without spectral class. The first two of these sources are hot DA white dwarfs showing an optical spectrum with broad Balmer lines. The source EUVE_J2329+414 is listed as having a possible association with an unclassified M star. We show that a pair of dMe stars are actually optical counterparts located within the error circle of the EUVE source position. The EUVE_J2114+503 remains unidentified even though all the possible candidates have been studied. Based on the count rates we predict a fainter white dwarf or a cataclysmic variable counterpart for this candidate. All five sources discovered with the EUVE deep survey, EUVE_J03 18+184, EUVE_J0419+217, EUVE_J2053-175, EUVE_J2056-171, and EUVE_J2233-096, have been identified as late-type stars. The spectral classes, distances, visual magnitudes, and estimated hydrogen column densities for these EUVE sources are presented.

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