An active K0 IV-V star and a hot white dwarf (EUVE J0702+129) in a wide binary.

Details An active K0 IV-V star and a hot white dwarf (EUVE J0702+129) in a wide binary. An active K0 IV-V star and a hot white dwarf (EUVE J0702+129) in a wide binary.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...318l...9v&link_type=abstract

Astronomy and Astrophysics, v.318, p.L9-L12

Astronomy and Astrophysics

Astrophysics

6

Binaries: General, Stars: Chromospheres, Stars: Evolution, White Dwarfs, Stars: Individual: Euve J0702+12.9

Scientific paper

We present far ultraviolet and optical spectroscopy of the Extreme Ultraviolet Explorer (EUVE) survey source EUVE J0702+129 revealing a composite K0 star plus DA white dwarf spectrum. The International Ultraviolet Explorer spectra show continuum emission from a hot white dwarf (Teff=30-40,000K) and a rising contribution from the K0 star at λ>2500Å. High resolution optical spectroscopy uncovers a high level of activity with strong Hα and Ca H&K emission; application of the Wilson-Bappu relation indicates that the secondary star is slightly above the main sequence (K0 IV-V). Both objects are found at a distance of ~130pc and they likely constitute a physical pair. The EUV emission is dominated by the white dwarf, but the late-type star certainly contributes at higher energy. An interesting parallel is drawn with other DA+K0 pairs with moderately active secondaries such as HD 18131 and HR 1608. The present discovery as well as other recent ones demonstrate the existence of a large population of white dwarfs hidden by evolved companions (III-IV).

Affiliated with

Also associated with

No associations

Rating

An active K0 IV-V star and a hot white dwarf (EUVE J0702+129) in a wide binary. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An active K0 IV-V star and a hot white dwarf (EUVE J0702+129) in a wide binary., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An active K0 IV-V star and a hot white dwarf (EUVE J0702+129) in a wide binary. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1772244