Faint Sources in the EUVE Survey. II. Identification of Two White Dwarfs and Four Late-Type Active Stars.

Details Faint Sources in the EUVE Survey. II. Identification of Two White Dwarfs and Four Late-Type Active Stars. Faint Sources in the EUVE Survey. II. Identification of Two White Dwarfs and Four Late-Type Active Stars.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1567v&link_type=abstract

The Astronomical Journal, v. 114, p. 1567.

Astronomy and Astrophysics

Astronomy

8

Surveys, White Dwarfs, Stars: Late-Type

Scientific paper

We identify six extreme ultraviolet (EUV) and soft x-ray sources from the joint EUVE/ROSAT catalog as two hydrogen-rich white dwarf stars (DA) and four late-type active stars (two dMe and two dKe). Both white dwarfs are relatively nearby (100 pc) and located in the Galactic plane; the DA0 white dwarf EUVE J2124+284 is very hot (Teff=53 000 K) and has a relatively low mass (0.48 Msun), while the DA1 white dwarf EUVE J2055+164 (Teff=38 400K) has a higher mass (0.85 Msun) than average. The new dM2.5e EUVE J2030+798 is at a distance of only ≍20 pc, while the new (dM1e EUVE J2332-012 is much more distant (≍80 pc) and below the Galactic plane (b = - 58°). The two K stars (EUVE J2206+637 and EUVE J2223+253) show weak Ca II H and K emission and are the most probable optical counterparts to these two EUV sources. Measurements of the ROSAT x-ray hardness ratio (0.1-0.4 vs 0.5-2.0 keV) in three objects support the identifications. The findings show in particular that many hot white dwarfs in the solar neighborhood await discovery.

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