Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-20
Mon.Not.Roy.Astron.Soc. 348 (2004) 1164
Astronomy and Astrophysics
Astrophysics
accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2004.07438.x
Since pulsating subdwarf B (sdBV or EC14026) stars were first discovered (Kilkenny et al, 1997), observational efforts have tried to realize their potential for constraining the interior physics of extreme horizontal branch (EHB) stars. Difficulties encountered along the way include uncertain mode identifications and a lack of stable pulsation mode properties. Here we report on Feige 48, an sdBV star for which follow-up observations have been obtained spanning more than four years, which shows some stable pulsation modes. We resolve the temporal spectrum into five stable pulsation periods in the range 340 to 380 seconds with amplitudes less than 1%, and two additional periods that appear in one dataset each. The three largest amplitude periodicities are nearly equally spaced, and we explore the consequences of identifying them as a rotationally split l=1 triplet by consulting with a representative stellar model. The general stability of the pulsation amplitudes and phases allows us to use the pulsation phases to constrain the timescale of evolution for this sdBV star. Additionally, we are able to place interesting limits on any stellar or planetary companion to Feige 48.
Kawaler Stephen D.
Reed Michael D.
No associations
LandOfFree
Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions 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 Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-405872