Unpublished conference/Abstract (Scientific congresses and symposiums)
The asteroseismic analysis of the pulsating sdB Feige 48 revisited
Van Grootel, Valérie; Charpinet, Stéphane; Fontaine, Gilles et al.
2007Third meeting on hot B subdwarfs and related objects
 

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Abstract :
[en] We present a new detailed analysis of the short period pulsating sdB star Feige 48, based on the same observations than in our previous work (Charpinet et al., 2005, A&A 443, 251) but with our new codes including the rotation of the star. Feige 48 is supposed to be a relatively fast rotator, showing a fine structure in its pulsation spectrum about 28 µHz on three groups in the 9 frequencies. On the other side, Feige 48 belongs to a close binary system (likely with a white dwarf) where the orbital period is 9.02 +/- 0.03h (S. O'Toole 2004). With our new codes including the rotation (for a given rotation law, we calculate associated multiplets for each frequency with the perturbative approach on the first order), avoiding us to make assumptions about the m=0 modes, we were able to fit all the 9 periods together, leading to sligthly different estimations for the structural parameters of Feige 48 than in our previous work. Moreover, the rotation of the star is found to be solid with a period of 32,540s <=> 9.038h, very close to the orbital period of the system determined by spectroscopy, confirming the reasonable assumption that the system is tidally locked. In this context, it was possible to exclude that Feige 48 has a fast rotating core in term of much poorer merit functions.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Van Grootel, Valérie  ;  Université de Toulouse/Université de Montréal (UdeM)
Charpinet, Stéphane
Fontaine, Gilles
Brassard, Pierre
Green, Elizabeth M
Chayer, Pierre
Language :
English
Title :
The asteroseismic analysis of the pulsating sdB Feige 48 revisited
Publication date :
July 2007
Event name :
Third meeting on hot B subdwarfs and related objects
Event organizer :
Dr. Karl Remeis-Sternwarte, Bamberg
Event place :
Bamberg, Germany
Event date :
du 23 au 27 juillet 2007
Audience :
International
Available on ORBi :
since 23 January 2012

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