White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra

Details White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..867g&link_type=abstract

ASTRONOMICAL JOURNAL V. 92:4, NO. OCT, P. 867, 1986

Astronomy and Astrophysics

Astronomy

43

Scientific paper

Spectrophotometry of six northern visual pairs containing two degenerate stars shows that the components are quite similar in luminosity and temperature. Presumably the two progenitors were similar and had nuclear lifetimes short compared to the subsequent cooling ages of the white dwarfs. The white dwarfs are near twins, with dispersion in radii below 14%. The mean cooling age of the pairs is 4 × l09 yr, their luminosity Mv = + 14.5 mag. One pair is relatively young, with components less similar. Study of pairs containing a white dwarf and a main-sequence star shows that a large fraction of such pairs are undiscovered. Those containing a hot white dwarf and a red main-sequence companion, discovered from the composite spectra, are quite blue and have an infrared excess. When the fluxes in pairs observed as resolved are added, the composite so synthesized is yellow or red, with a large violet or ultraviolet excess. Methods of discovery of white dwarfs leave regions of the color-color diagrams untouched. A possible technique of searching for violet excess suggested involves magnitudes in the infrared, visual, and blue. Analysis of old novae, spectroscopic binaries containing a white dwarf, and a dM star with a faint white dwarf companion displays composite spectra. Whether the large number of missing white dwarfs in noninteracting binaries exist, or whether the progenitor binaries have been dissolved, remains undecided.

Affiliated with

Also associated with

No associations

Rating

White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra 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 White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and White Dwarfs in Wide Binaries - Part Two - Double Degenerates and Composite Spectra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1735388