RADIATIVE HE-DWARF ATMOSPHERE ELECTROMAGNETIC CONTINUOUS SPECTRA((1S)+HE(1S(2)) PROCESSES AS THE SOURCE OF THE DB WHITE)

Citation
Aa. Mihajlov et al., RADIATIVE HE-DWARF ATMOSPHERE ELECTROMAGNETIC CONTINUOUS SPECTRA((1S)+HE(1S(2)) PROCESSES AS THE SOURCE OF THE DB WHITE), The Astrophysical journal, 454(1), 1995, pp. 420-428
Citations number
17
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
454
Issue
1
Year of publication
1995
Part
1
Pages
420 - 428
Database
ISI
SICI code
0004-637X(1995)454:1<420:RHAECS>2.0.ZU;2-8
Abstract
The influence of the processes of radiative charge transfer and photoa ssociation during He+ + He collisional processes, as well as the proce ss of the photodissociation of the He-2(+) molecular ion, on the forma tion of the continuous spectrum of the DB white dwarf atmospheres with T-eff = 12,000-30,000 K, for log g (gravity) = 7 and 8, is studied wi thin the wavelength range lambda = 200-800 mm. It is shown that the co ntribution of these processes relative to other relevant radiative pro cesses is particularly important for T-eff less than or equal to 16,00 0 K and increases with the decrease of T-eff. Moreover, it is found th at the influence of the considered He+ + He radiative processes is par ticularly pronounced in the UV range.