2018A&A...609A.107W


Query : 2018A&A...609A.107W

2018A&A...609A.107W - Astronomy and Astrophysics, volume 609A, 107-107 (2018/1-1)

Metal abundances in hot white dwarfs with signatures of a superionized wind.

WERNER K., RAUCH T. and KRUK J.W.

Abstract (from CDS):

About a dozen hot white dwarfs with effective temperatures Teff=65000-120000K exhibit unusual absorption features in their optical spectra. These objects were tentatively identified as Rydberg lines of ultra-high excited metals in ionization stagesV-X, indicating line formation in a dense environment with temperatures near 106 K. Since some features show blueward extensions, it was argued that they stem from a superionized wind. A unique assignment of the lines to particular elements is not possible, although they probably stem from C, N, O, and Ne. To further investigate this phenomenon, we analyzed the ultraviolet spectra available from only three stars of this group; that is, two helium-rich white dwarfs, HE 0504-2408 and HS 0713+3958 with spectral type DO, and a hydrogen-rich white dwarf, HS 2115+1148 with spectral type DAO. We identified light metals (C, N, O, Si, P, and S) with generally subsolar abundances and heavy elements from the iron group (Cr, Mn, Fe, Co, Ni) with solar or oversolar abundance. The abundance patterns are not unusual for hot WDs and can be interpreted as the result of gravitational settling and radiative levitation of elements. As to the origin of the ultra-high ionized metals lines, we discuss the possible presence of a multicomponent radiatively driven wind that is frictionally heated.

Abstract Copyright: © ESO, 2018

Journal keyword(s): stars: abundances - stars: atmospheres - stars: evolution - stars: AGB and post-AGB - white dwarfs

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 RX J0503.9-2854 WD* 05 03 55.5147387403 -28 54 34.631014015 12.29 13.55 13.58     DO 94 0
2 HE 0504-2408 WD* 05 06 18.0949473531 -24 04 00.660483067       15.88 16.07 DO.7 13 0
3 HS 0713+3958 WD* 07 17 02.7206580901 +39 53 23.609092042   15.8   16.8   DO.7 15 0
4 HS 0727+6003 WD* 07 31 21.3886722073 +59 57 37.008869473   15.8 16.15     DO 13 0
5 V* DN Leo Pu* 10 38 55.2344094277 +10 03 48.485524647   9.76 9.93     Bp 139 0
6 HD 342907 * 18 43 39.0634248958 +23 06 16.602071248   11.38 9.97     K2 3 0
7 HS 2027+0651 WD* 20 29 32.5059737392 +07 01 07.702028227   16.1   16.9   DO 14 0
8 HS 2115+1148 WD* 21 18 18.7294747125 +12 01 32.073147573   16.0   16.7   DAOZ.8 16 0

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2021.10.27-08:30:07

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