Query : 2005A&A...442.1015K

2005A&A...442.1015K - Astronomy and Astrophysics, volume 442, 1015-1021 (2005/11-2)

Time-resolved FUSE photometric and spectroscopic observations: PG 1219+534, PG 1605+072, and PG 1613+426.


Abstract (from CDS):

We report the detection of pulsations in the far ultraviolet (FUV) light curves of PG1219+534, PG1605+072 and PG1613+426 obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) in time-tagged mode (TTAG). Exposures of the order of a few ksec were sufficient to observe the main frequencies of PG1219+534 and PG1605+072 and confirm the detection of a pulsation mode at the surface of PG1613+426 as reported from ground. For the first time we derive time-resolved spectroscopic FUSE data of a sdB pulsator (PG1605+072) and comment on its line profile variation diagram (lpv diagram). We observe the phase shift between the maximum luminosity and the maximum radius to be consistent with the model of an adiabatic pulsator. We also present evidence that the line broadening previously reported is not caused by rotation but is rather an observational bias due to the rapid Doppler shift of the lines with 17km/s amplitude. Thus our observations do not support the previous claim that PG1605+072 is (or will evolve into) an unusually fast rotating degenerate dwarf. These results demonstrate the asteroseismological potential of the FUSE satellite which should be viewed as another powerful means of investigating stellar pulsations, along with the MOST and COROT missions.

Abstract Copyright:

Journal keyword(s): instumentation: photometers - instumentation: spectrographs - line: profiles - stars: white dwarfs - techniques: radial velocities - stars: oscillations (including pulsations)

CDS comments: Paragraph 1 NGC 67524 is a misprint for NGC 6752

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 82 1
2 PG 1605+072 HS* 16 08 03.6872637792 +07 04 28.748468964   12.53 12.83 13.18   sdB0.2VIHe3 129 0
3 PG 1613+426 HS* 16 14 46.9286241816 +42 27 35.946945648   13.99 14.39 14.76   sdOA 25 0
4 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1944 0

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