ORFEUS observations of the DO white dwarf HD 149499B.

Details ORFEUS observations of the DO white dwarf HD 149499B. ORFEUS observations of the DO white dwarf HD 149499B.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300l...5n&link_type=abstract

Astronomy and Astrophysics, v.300, p.L5

Astronomy and Astrophysics

Astrophysics

18

Stars: Individual: Hd 149499B, White Dwarfs, Stars: Fundamental Parameters, Ultraviolet: Stars, Ultraviolet: Ism

Scientific paper

We present an analysis of a hig-resolution FUV spectrum (912...1170Angstroems) of the cool DO white dwarf HD 149499 B. Observations were performed with the Berkeley EUV/FUV spectrometer of the ORFEUS experiment. The analysis, performed with a grid of LTE model atmospheres, yielded the basic parameters Teff = 49500+/-500K and log g = 7.97+/-0.08. The photospheric hydrogen Lyman lines in the FUV spectrum indicate the presence of hydrogen: log nH/nHe =-0.65+/-0.12.The implications of this finding for the spectral evolution of white dwarfs are discussed. A check of the LTE assumption was performed by a comparison with NLTE atmospheres calculated for appropriate parameters. The interstellar components of the hydrogen Lyman lines are used for an estimate of the hydrogen column towards the HD 149499 system: N_H_ about 1x10^19^/cm2.

Affiliated with

Also associated with

No associations

Rating

ORFEUS observations of the DO white dwarf HD 149499B. 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 ORFEUS observations of the DO white dwarf HD 149499B., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ORFEUS observations of the DO white dwarf HD 149499B. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1266080