2015A&A...583A.131W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:58:22

2015A&A...583A.131W - Astronomy and Astrophysics, volume 583A, 131-131 (2015/11-1)

Hubble Space Telescope ultraviolet spectroscopy of the hottest known helium-rich pre-white dwarf KPD 0005+5106.

WERNER K. and RAUCH T.

Abstract (from CDS):

We present a model-atmosphere analysis of the ultraviolet echelle spectra of KPD 0005+5106 taken with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. The star is the hottest known pre-white dwarf (Teff=200000±20000K, logg=6.7±0.3cm/s2). Its atmosphere is composed of helium with trace amounts of metals. It is of the so-called O(He) spectral type that comprises very hot helium-rich pre-white dwarfs whose origin is debated. From neon and silicon ionisation balances, we derive tighter constraints on the effective temperature (195000±15000K) and improve previous abundance determinations of these elements. We confirm the idea that KPD 0005+5106 is the descendant of an R Coronae Borealis (RCB) star, so is the outcome of a binary-white-dwarf merger. We discuss the relation of KPD 0005+5106 to other O(He) and RCB stars.

Abstract Copyright:

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

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 - 2020
#notes
1 KPD 0005+5106 WD* 00 08 18.1706793307 +51 23 16.594540226 11.80 13.04 13.32 13.53   DOZ1 113 0
2 NGC 246 PN 00 47 03.3420803259 -11 52 18.975106178 10.15 11.52 11.76 12.18   PG1159 452 0
3 PG 1501+664 WD* 15 02 09.6296551839 +66 12 19.146114550   16.07 16.37     DZQ1 149 0
4 SDSS J172854.34+361958.6 WD* 17 28 54.3428227102 +36 19 58.616043599   16.8   17.2   PG1159/O(He) 8 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-01:58:22

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