2005A&A...439..317K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:00:48

2005A&A...439..317K - Astronomy and Astrophysics, volume 439, 317-321 (2005/8-3)

HS 0146+1847 - a DAZB white dwarf of very unusual composition.

KOESTER D., NAPIWOTZKI R., VOSS B., HOMEIER D. and REIMERS D.

Abstract (from CDS):

HS0146+1847, originally identified as a white dwarf candidate in proper motion surveys, was rediscovered as a candidate in the Hamburg Quasar Survey. Spectra obtained for the SPY (ESO Supernova Ia Progenitor) survey show strong Balmer and CaII lines, suggesting a classification as DAZ white dwarf. Contrary to the objects known so far in this class, HS0146+1847 has a helium-rich atmosphere at Teff=11500K. This is confirmed by very weak He lines, changing the classification to DAZB. Mg and Fe lines are also detected. We discuss the physics of Balmer line broadening by neutral helium, present a spectral analysis and note some implications for the accretion/diffusion scenario of heavy elements in cool white dwarfs.

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - stars: atmospheres - stars: abundances

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Wolf 88 WD* 01 48 56.7964000809 +19 02 27.481912783   15.5   15.4   DAZB 41 0
2 Ross 17 PM* 02 10 04.8094976131 +35 25 49.493441738   15.4   13.3   M3 32 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:00:48

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