2004A&A...428..969K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:44:02

2004A&A...428..969K - Astronomy and Astrophysics, volume 428, 969-981 (2004/12-4)

Whole Earth Telescope observations of the pulsating hot white dwarf PG 1707+427.

KAWALER S.D., POTTER E.M., VUCKOVIC M., DIND Z.E., O'TOOLE S., CLEMENS J.C., O'BRIEN M.S., GRAUER A.D., NATHER R.E., MOSKALIK P.A., CLAVER C.F., FONTAINE G., WESEMAEL F., BERGERON P., VAUCLAIR G., DOLEZ N., CHEVRETON M., KLEINMAN S.J., WATSON T.K., BARSTOW M.A., SANSOM A.E., WINGET D.E., KEPLER S.O., KANAAN A., BRADLEY P.A., DIXSON J., PROVENCAL J. and BEDDING T.R.

Abstract (from CDS):

We report on the analysis of multisite time-series photometry of the pulsating pre-white dwarf (GW Vir star) PG 1707+427, obtained by the Whole Earth Telescope collaboration. This is the last of the known GW Vir stars without surrounding nebulae to be resolved by multisite data. Successful resolution of the pulsation spectrum resulted from the combination of high signal-to-noise observations with a large telescope and wide coverage in longitude with smaller telescopes. We find a series of 8 pulsation frequencies (along with two nonlinear combination frequencies), and identify 7 of them as part of a sequence of l=1 modes, with a common period spacing of 23.0s. This spacing implies that the mass of PG 1707+427 is 0.57M. Preliminary model fits suggest that the mass determined via asteroseismology is consistent with the mass determined from spectroscopy combined with evolutionary tracks.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: white dwarfs - stars: oscillations - stars: individual: PG 1707+427

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 - 2020
#notes
1 PG 0122+200 WD* 01 25 22.5118179721 +20 17 56.963251283   16.2   16.9   DOZ.7 102 0
2 NGC 1501 PN 04 06 59.3919688584 +60 55 14.277444117   15.17 13.0     [WO4] 280 1
3 V* GW Vir WD* 12 01 45.9728868858 -03 45 40.627851273   14.87 15.04     DOQZ1 464 0
4 Ton 1559 WD* 13 09 57.6765586750 +35 09 47.189084620   15.51   15.2   DA4.4 122 0
5 PG 1707+427 WD* 17 08 47.6869967260 +42 41 00.558830272   16.18       PG1159 109 0
6 MWP 1 PN 21 17 08.2817539788 +34 12 27.415871206     12.33     PG1159 173 0
7 V* IR Peg WD* 21 34 08.2124719240 +06 50 57.662044329   16.15       PG1159 112 0
8 V* V409 And WD* 23 27 15.9352164958 +40 01 23.428438900   14.1 15.41     DO 69 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-15:44:02

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