2011MNRAS.415.1220R

Query : 2011MNRAS.415.1220R

2011MNRAS.415.1220R - Mon. Not. R. Astron. Soc., 415, 1220-1227 (2011/August-1)

The pulsations of PG 1351+489.

REDAELLI M., KEPLER S.O., COSTA J.E.S., WINGET D.E., HANDLER G., CASTANHEIRA B.G., KANAAN A., FRAGA L., HENRIQUE P., GIOVANNINI O., PROVENCAL J.L., SHIPMAN H.L., DALESSIO J., THOMPSON S.E., MULLALLY F., BREWER M.M., CHILDERS D., OKSALA M.E., ROSEN R., WOOD M.A., REED M.D., WALTER B., STRICKLAND W., CHANDLER D., WATSON T.K., NATHER R.E., MONTGOMERY M.H., BISCHOFF-KIM A., HANSEN C.J., NITTA A., KLEINMAN S.J., CLAVER C.F., BROWN T.M., SULLIVAN D.J., KIM S.-L., CHEN W.-P., YANG M., SHIH C.-Y., ZHANG X., JIANG X., FU J.N., SEETHA S., ASHOKA B.N., MARAR T.M.K., BALIYAN K.S., VATS H.O., CHERNYSHEV A.V., IBBETSON P., LEIBOWITZ E., HEMAR S., SERGEEV A.V., ANDREEV M.V., JANULIS R., MEISTAS E.G., MOSKALIK P., PAJDOSZ G., BARAN A., WINIARSKI M., ZOLA S., OGLOZA W., SIWAK M., BOGNAR Zs., SOLHEIM J.-E., SEFAKO R., BUCKLEY D., O'DONOGHUE D., NAGEL T., SILVOTTI R., BRUNI I., FREMY J.R., VAUCLAIR G., CHEVRETON M., DOLEZ N., PFEIFFER B., BARSTOW M.A., CREEVEY O.L., KAWALER S.D. and CLEMENS J.C.

Abstract (from CDS):

PG 1351+489 is one of the 20 DBVs - pulsating helium-atmosphere white dwarf stars - known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate period determinations for the main peak at 489.334 48 s and two other normal modes using data from the Whole Earth Telescope (WET) observations of 1995 and 2009. In 2009, we detected a new pulsation mode and the main pulsation mode exhibited substantial change in its amplitude compared to all previous observations. We were able to estimate the star's rotation period, of 8.9 h, and discuss a possible determination of the rate of period change of (2.0 ±0.9) {x} 10–13 s s–1, the first such estimate for a DBV.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: evolution - stars: individual: PG 1351+489 - stars: oscillations - 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 - 2026 		#notes
1 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 505 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 PSR J1915+1606 Psr 19 15 27.99999 +16 06 27.4034     22.5     ~ 1032 1

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