Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426

Details Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426 Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426

2005-06-27

arxiv.org/abs/astro-ph/0506646v1

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures, in Referee format. Accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20052940

We report on the detection of pulsations in the far ultraviolet (hereafter 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 Ksecs 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 its line profile variation diagram (hereafter 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 17 km.s-1 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 investigation of stellar pulsations along with the MOST and COROT missions.

Affiliated with

Also associated with

No associations

Rating

Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time-resolved FUSE Photometric and Spectroscopic Observations: PG1219+534, PG1605+072, and PG1613+426 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-646995