2005A&A...441..231Q


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:25:47

2005A&A...441..231Q - Astronomy and Astrophysics, volume 441, 231 (2005/10-1)

The nature of the driving mechanism in the pulsating hybrid PG 1159 star Abell 43.

QUIRION P.-O., FONTAINE G. and BRASSARD P.

Abstract (from CDS):

We extend our previous pulsational stability analyses of PG 1159 stars by modeling the hybrid PG 1159 type star Abell 43. We show that the standard κ-mechanism due to the ionization of C and O in the envelope of this H-rich PG 1159 star is perfectly able to drive g-mode pulsations. Thus, contrary to a recent suggestion, there is no need to invoke any new or exotic mechanism to explain the pulsational instabilities observed in this particular star. Our expected instability band for l=1 modes extends in period from ∼2604s to ∼5529s, which is consistent with the available photometric observations of Abell 43. We also suggest that efforts to detect luminosity variations in its sibling NGC 7094 be pursued.

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - stars: oscillations - stars: individual: Abell 43

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 PN A66 43 PN 17 53 32.2767918769 +10 37 24.211581466   14.53 14.71     O7fk 125 0
2 SH 2-68 PN 18 24 58.4294144035 +00 51 36.016896875   16.0 16.5     DAOZ.6 120 1
3 NGC 7094 PN 21 36 52.9688055651 +12 47 19.100520826     13.35     ~ 176 0
4 V* V409 And WD* 23 27 15.9352164958 +40 01 23.428438900   14.1 15.41     DO 69 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-07:25:47

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