2001MNRAS.323L..43H

Query : 2001MNRAS.323L..43H

2001MNRAS.323L..43H - Mon. Not. R. Astron. Soc., 323, L43-L47 (2001/May-2)

Discovery and asteroseismological analysis of a new pulsating DB white dwarf star, PG 2246+121.

HANDLER G.

Abstract (from CDS):

We report 36.6h of time-resolved CCD photometry of the DB white dwarf star PG 2246+121 and the discovery that it is a new pulsating variable. Analysis of our compact single-site data set allowed the detection of three mode multiplets, two triplets at 256 and 329s, respectively, and one doublet at 286s. The frequency splitting within those structures is exactly the same within the length and accuracy of our data set.

We argue that these multiplets are the result of non-radial g-mode pulsations, most probably of spherical degree ℓ=1, which then yields a formal stellar rotation period of 2.00±0.12d. We suggest that the excited modes are three consecutive radial overtones of order 3-7, most likely k=4,5,6. This discovery's impact on the understanding of pulsating DB white dwarfs is discussed.


Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): stars: individual: PG 2246+121 - stars: individual: ZZ Ceti - stars: oscillations - stars: variables: other

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* ZZ Cet WD* 01 36 13.6153974672 -11 20 32.632874601   14.328 14.16 14.4   DA4.0 307 0
2 V* EM UMa WD* 13 53 09.9687043752 +48 40 21.171407268   16.5   17.0   DB2 105 0
3 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 364 0
4 V* QU Tel WD* 20 09 40.1871967824 -52 25 15.864452508 14.51 15.25 15.03     DB2 60 1
5 EGGR 908 WD* 22 48 45.4800657240 +12 20 07.219101336   16.6   16.6   DB4 27 0

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