2003MNRAS.340.1031H

Query : 2003MNRAS.340.1031H

2003MNRAS.340.1031H - Mon. Not. R. Astron. Soc., 340, 1031-1038 (2003/April-2)

Amplitude and frequency variability of the pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 observed with the Whole Earth Telescope.

HANDLER G., O'DONOGHUE D., MULLER M., SOLHEIM J.-E., GONZALEZ-PEREZ J.M., JOHANNESSEN F., PAPARO M., SZEIDL B., VIRAGHALMY G., SILVOTTI R., VAUCLAIR G., DOLEZ N., PALLIER E., CHEVRETON M., KURTZ D.W., BROMAGE G.E., CUNHA M.S., OSTENSEN R., FRAGA L., KANAAN A., AMORIM A., GIOVANNINI O., KEPLER S.O., DA COSTA A.F.M., ANDERSON R.F., WOOD M.A., SILVESTRI N., KLUMPE E.W., CARLTON R.F., MILLER R.H., McFARLAND J.P., GRAUER A.D., KAWALER S.D., RIDDLE R.L., REED M.D., NATHER R.E., WINGET D.E., HILL J.A., METCALFE T.S., MUKADAM A.S., KILIC M., WATSON T.K., KLEINMAN S.J., NITTA A., GUZIK J.A., BRADLEY P.A., SEKIGUCHI K., SULLIVAN D.J., SULLIVAN T., SHOBBROOK R.R., JIANG X., BIRCH P.V., ASHOKA B.N., SEETHA S., GIRISH V., JOSHI S., DOROKHOVA T.N., DOROKHOV N.I., AKAN M.C., MEISTAS E.G., JANULIS R., KALYTIS R., ALISAUSKAS D., ANGUMA S.K., KALEBWE P.C., MOSKALIK P., OGLOZA W., STACHOWSKI G., PAJDOSZ G. and ZOLA S.

Abstract (from CDS):

We have acquired new time series photometry of the two pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 with the Whole Earth Telescope. Additional single-site photometry is also presented. We use all these data plus all available archival measurements to study the temporal behaviour of the pulsational amplitudes and frequencies of these stars for the first time.

We demonstrate that both KUV 05134+2605 and PG 1654+160 pulsate in many modes, the amplitudes of which are variable in time; some frequency variability of PG 1654+160 is also indicated. Beating of multiple pulsation modes cannot explain our observations; the amplitude variability must therefore be intrinsic. We cannot find stable modes to be used for determinations of the evolutionary period changes of the stars. Some of the modes of PG 1654+160 appear at the same periods whenever detected. The mean spacing of these periods (~40 s) suggests that they are probably caused by non-radial gravity-mode pulsations of spherical degree ℓ= 1. If so, PG 1654+160 has a mass around 0.6 M☉.

The time-scales of the amplitude variability of both stars (down to two weeks) are consistent with theoretical predictions of resonant mode coupling, a conclusion which might however be affected by the temporal distribution of our data.


Abstract Copyright: 2003 RAS

Journal keyword(s): stars: individual: KUV 05134+2605 - stars: individual: PG 1654+160 - stars: oscillations - stars: variables: other.

Simbad objects: 7

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Number of rows : 7
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 NGC 1501 PN 04 06 59.3920909320 +60 55 14.278542024   15.17 13.0     [WO4] 314 1
2 KUV 05134+2605 WD* 05 16 27.7878681552 +26 08 37.543234056   16.5 16.70 16.6   DB 40 0
3 V* SW LMi WD* 09 57 49.4086247376 +33 59 23.691674976   17       DB 61 0
4 V* CW Boo WD* 14 58 32.6381816376 +10 08 18.108688128   15.89       DBA 59 0
5 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 364 0
6 PG 1654+160 WD* 16 56 57.4672879608 +15 56 27.791267532           DB2 55 0
7 MWP 1 PN 21 17 08.2817782392 +34 12 27.415995372   12.731 13.082 13.379   PG1159 199 0

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