2003A&A...401..639K


Query : 2003A&A...401..639K

2003A&A...401..639K - Astronomy and Astrophysics, volume 401, 639-654 (2003/4-2)

The everchanging pulsating white dwarf GD 358.

KEPLER S.O., NATHER R.E., WINGET D.E., NITTA A., KLEINMAN S.J., METCALFE T., SEKIGUCHI K., JIANG X., SULLIVAN D., SULLIVAN T., JANULIS R., MEISTAS E., KALYTIS R., KRZESINSKI J., OGLOZA W., ZOLA S., O'DONOGHUE D., ROMERO-COLMENERO E., MARTINEZ P., DREIZLER S., DEETJEN J., NAGEL T., SCHUH S.L., VAUCLAIR G., FU J.N., CHEVRETON M., SOLHEIM J.-E., GONZALEZ PEREZ J.M., JOHANNESSEN F., KANAAN A., COSTA J.E., COSTA A.F.M., WOOD M.A., SILVESTRI N., AHRENS T.J., JONES A.K., COLLINS A.E., BOYER M., SHAW J.S., MUKADAM A., KLUMPE E.W., LARRISON J., KAWALER S., RIDDLE R., ULLA A. and BRADLEY P.

Abstract (from CDS):

We report 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23rd to June 8th, 2000. We acquired more than 232000 independent measurements. We also report on 48 hours of time-series photometric observations in Aug 1996. We detected the non-radial g-modes consistent with degree l=1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude l=2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order. At one point during the 1996 observations, most of the pulsation energy was transferred into the radial order k=8 mode, which displayed a sinusoidal pulse shape in spite of the large amplitude. The multiplet structure of the individual modes changes from year to year, and during the 2000 observations only the k=9 mode displays clear normal triplet structure. Even though the pulsation amplitudes change on timescales of days and years, the eigenfrequencies remain essentially the same, showing the stellar structure is not changing on any dynamical timescale.

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - stars: variables: general - stars: oscillations - stars: individual: GD 358 - stars: evolution

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 EGGR 409 WD* 01 14 37.6538960064 +10 41 04.757053956   15.27 15.41 15.69   DB2.5 65 0
2 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 334 0
3 V* ZZ Psc WD* 23 28 47.6365087803 +05 14 54.235051503   13.17   13.0   DA4.1 462 0

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2022.08.17-18:22:39

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