2002A&A...394..647H

Query : 2002A&A...394..647H

2002A&A...394..647H - Astronomy and Astrophysics, volume 394647-651 (2002/11-1)

Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G231-40.

HEBRARD G., ALLARD N.F., HUBENY I., LACOUR S., FERLET R. and VIDAL-MADJAR A.

Abstract (from CDS):

We present new theoretical calculations of the total line profiles of Lyman α and Lyman β which include perturbations by both neutral hydrogen and protons and all possible quasi-molecular states of H2 and H2+. They are used to improve theoretical modeling of synthetic spectra for cool DA white dwarfs. We compare them with FUSE observation of G231-40. The appearance of the line wings between Lyman α and Lyman β is shown to be sensitive to the relative abundance of hydrogen ions and neutral atoms, and thereby to provide a temperature diagnostic for stellar atmospheres and laboratory plasmas.

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Journal keyword(s): line: profiles - radiation mechanisms: general - stars: atmospheres - stars: individual: G231-40 - white dwarfs - ultraviolet: stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 563 1
2 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 526 0
3 HD 340611 WD* 20 34 21.8847019255 +25 03 49.750446346 10.687 11.471 11.546 11.648 11.728 DA2.4 329 0
4 EGGR 378 WD* 21 18 56.2636115928 +54 12 41.243943888 11.76     12.9   DA3.4 111 1

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