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Titolo:
THE PECULIAR COOL WHITE-DWARF LHS-1126 REVISITED
Autore:
BERGERON P; RUIZ MT; LEGGETT SK; SAUMON D; WESEMAEL F;
Indirizzi:
UNIV MONTREAL,DEPT PHYS,CP 6128,SUCC A MONTREAL H3C 3J7 QUEBEC CANADA UNIV ARIZONA,LUNAR & PLANETARY LAB TUCSON AZ 85721 UNIV CHILE,DEPT ASTRON SANTIAGO CHILE USN OBSERV FLAGSTAFF AZ 86002
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 423, anno: 1994,
parte:, 1
pagine: 456 - 460
SICI:
0004-637X(1994)423:1<456:TPCWLR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFRARED PHOTOMETRY; ATMOSPHERIC COMPOSITION; SPECTRA; CARBON;
Keywords:
STARS, ATMOSPHERES; STARS, INDIVIDUAL (LHS-1126); WHITE DWARFS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
P. Bergeron et al., "THE PECULIAR COOL WHITE-DWARF LHS-1126 REVISITED", The Astrophysical journal, 423(1), 1994, pp. 456-460

Abstract

We present a detailed analysis of new photometric and spectroscopic data, both in the optical and in the infrared, of the cool white dwarf LHS 1126. We show that the peculiar energy distribution of this object, and especially the large infrared flux deficiency, is the result of the collision-induced absorption by molecular hydrogen due to collisions with helium. The effective temperature and the helium abundance aredetermined from a fit to the energy distribution while the surface gravity is constrained by the trigonometric parallax measurement. We obtain T(eff) = 5400 +/- 200 K, log g = 7.85 +/- 0.17, and log N(He)/N(H)= 0.8 +/- 0.2. The nature of the spectroscopic features observed previously in the infrared and in the optical are rediscussed within the context of both these new observations and our model atmosphere fit.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/08/18 alle ore 08:32:19