1996A&A...314..182P

Query : 1996A&A...314..182P

1996A&A...314..182P - Astronomy and Astrophysics, volume 314182-190 (1996/10-1)

Whole Earth Telescope observations and seismological analysis of the cool ZZ Ceti star GD 154.

PFEIFFER B., VAUCLAIR G., DOLEZ N., CHEVRETON M., FREMY J.-R., BARSTOW M., BELMONTE J.A., KEPLER S.O., KANAAN A., GIOVANNINI O., FONTAINE G., BERGERON P., WESEMAEL F., GRAUER A.D., NATHER R.E., WINGET D.E., PROVENCAL J., CLEMENS J.C., BRADLEY P.A., DIXSON J., KLEINMAN S.J., WATSON T.K., CLAVER C.F., MATZEH T., LEIBOWITZ E.M. and MOSKALIK P.

Abstract (from CDS):

This paper presents the results of high speed photometric observations of the cool variable DA white dwarf (DAV) GD 154 obtained with the Whole Earth Telescope. GD 154 is one of the coolest pulsating DA white dwarfs and its study is important for understanding the red edge of the ZZ Ceti instability strip. Its power spectrum is dominated by three independent modes (P1=1186.5s, P2=1088.6s and P3=402.6s), and their harmonics and linear combinations. None of the half-integer harmonics reported in previous observations were present during the WET campaign. We propose that the observed modes are trapped in the thin outer hydrogen layers. From the resulting identification of the pulsation modes, one derives an estimate of the rotation period (2.3days) and of the mass of the outer hydrogen layer (2x10–10M*).

Abstract Copyright: ∼

Journal keyword(s): white dwarfs - stars: oscillations - stars: interiors - stars: individual: GD 154

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 - 2026 		#notes
1 EGGR 34 WD* 04 20 17.2470258432 +36 16 27.266860200   15.79   15.5   DA4.4 76 0
2 V* BR Cam WD* 04 59 27.2435598163 +55 25 21.057303220   15.98   16.1   DA4.3 70 0
3 Ton 1559 WD* 13 09 57.6766028952 +35 09 47.187935136   15.51   15.2   DA4.4 138 0
4 V* EM UMa WD* 13 53 09.9687043752 +48 40 21.171407268   16.5   17.0   DB2 105 0
5 GD 165 WD* 14 24 39.1495824408 +09 17 14.160753960   14.46 14.32 14.6 14.91 DA4.1 176 0
6 Ross 808 WD* 16 01 23.1868739817 +36 48 34.288643534   14.53   14.7   DA4.4 117 0
7 V* DN Dra WD* 16 48 25.6318375106 +59 03 22.658985521   12.34 12.17 12.44   DA4.0 228 0
8 PG 2303+243 WD* 23 06 17.6909597616 +24 32 07.677555468   15.4   15.2   DA4.3 60 0

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