Atmospheric analysis of the carbon white dwarf G227-5

Details Atmospheric analysis of the carbon white dwarf G227-5 Atmospheric analysis of the carbon white dwarf G227-5

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..746w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 746-750.

Astronomy and Astrophysics

Astrophysics

26

Carbon Stars, Stellar Atmospheres, Stellar Composition, White Dwarf Stars, Atmospheric Models, Helium, Hydrogen, Stellar Spectra

Scientific paper

Observations and a model atmosphere analysis of the spectrum of the white dwarf G227-5 (= 1728 + 56) are reported. This star's spectrum is dominated by lines of C I, but weaker features attributed to H I and He I are also found. With the gravity fixed at log g = 8, the following atmospheric parameters are derived: T(eff) = 12,500 + or - 500 K, and the number abundances C:He = (3 + or - 1) x 10 to the -3rd and H:He = (2 + or - 1) x 10 to the -4th. With these relatively high values of C:He and T(eff), it appears that G227 - 5 represents a new type of white dwarf defined by the presence of C I lines in its spectrum and that it can be interpreted as being an object near the maximum of the carbon abundance vs. T(eff) curve predicted for carbon being brought to the surface by the convective zone penetrating downward into a carbon abundance gradient.

Affiliated with

Also associated with

No associations

Rating

Atmospheric analysis of the carbon white dwarf G227-5 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 Atmospheric analysis of the carbon white dwarf G227-5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Atmospheric analysis of the carbon white dwarf G227-5 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-925421