Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..104l&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 1, Sept. 1979, p. 104-111.
Astronomy and Astrophysics
Astrophysics
16
Helium, Hydrogen, Stellar Atmospheres, Stellar Coronas, Stellar Models, White Dwarf Stars, Emission Spectra, Energy Dissipation, Line Spectra, Optical Thickness, Stellar Radiation, Stellar Spectra, Stellar Structure, Stellar Temperature, X Ray Spectra
Scientific paper
Families of zero-mass-loss coronal models based on the minimum-flux prescription of Hearn (1975), in which bound-bound, bound-free, and free-free radiative processes with their differing emissivity vs. temperature laws are included, have been computed. These models are applied to the case of white-dwarf envelopes of pure hydrogen or helium, and the results are expressed as relationships between the required total energy flux, the coronal base pressure, and its temperature. The soft X-ray detection of Sirius by the ANS group is discussed. If all the X-ray flux is ascribed to a minimum-flux hydrogen corona surrounding the white dwarf Sirius B, it must have a temperature of 1.6 + or -0.3 million K and a base pressure of 110,000 + or - 40,000 dyne/sq cm. The surface energy flux needed to heat such a corona is (9 + or - 5) x 10 to the 10th erg/sq cm per sec.
Lampton Michael
Mewe Rolf
No associations
LandOfFree
Minimum-flux coronal models for hydrogen and helium white dwarf atmospheres 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 Minimum-flux coronal models for hydrogen and helium white dwarf atmospheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Minimum-flux coronal models for hydrogen and helium white dwarf atmospheres will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1817258