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Titolo:
Discovery of a highly magnetic white dwarf with strong carbon features
Autore:
Schmidt, GD; Liebert, J; Harris, HC; Dahn, CC; Leggett, SK;
Indirizzi:
Univ Arizona, Steward Observ, Tucson, AZ 85721 USA Univ Arizona Tucson AZUSA 85721 na, Steward Observ, Tucson, AZ 85721 USA USN Observ, Flagstaff Stn, Flagstaff, AZ 86002 USA USN Observ Flagstaff AZ USA 86002 Flagstaff Stn, Flagstaff, AZ 86002 USA UKIRT, Joint Astron Ctr, Hilo, HI 96720 USA UKIRT Hilo HI USA 96720UKIRT, Joint Astron Ctr, Hilo, HI 96720 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 512, anno: 1999,
parte:, 1
pagine: 916 - 919
SICI:
0004-637X(19990220)512:2<916:DOAHMW>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIELDS;
Keywords:
polarization; stars : individual (LHS 2229); stars : magnetic fields; white dwarfs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Schmidt, GD Univ Arizona, Steward Observ, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 Observ, Tucson, AZ 85721 USA
Citazione:
G.D. Schmidt et al., "Discovery of a highly magnetic white dwarf with strong carbon features", ASTROPHYS J, 512(2), 1999, pp. 916-919

Abstract

Systematic follow-up of high proper-motion stars has identified a new coolmagnetic white dwarf that displays a series of spectacular absorption bands in the range 4200-6500 Angstrom. The spectrum bears a striking resemblance to that of LP 790-29, a magnetic DQ star dominated by what are apparentlyZeeman-shifted Swan bands of Ct. However, key differences in the detailed spectra, polarization, and temperature of the two stars indicate that instead LHS 2229 may represent the first case of a magnetic "peculiar" DQ white dwarf, where absorption in the optical is produced by C2H or another carbon-hydrogen compound. Crude arguments suggest that the field strength on LHS 2229 is in the neighborhood of 10(8) G. BVI photometry proves to be effective in identifying such peculiar stars, since they lie well outside the mainwhite dwarf sequence in a color-color diagram.

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Documento generato il 18/08/18 alle ore 08:31:53