Astrophysics and Space Science

, Volume 291, Issue 3, pp 379–386

Progress on the Front of Pulsating Subdwarf B Stars

  • Gilles Fontaine
  • Elizabeth M. Green
  • Pierre Brassard
  • Stéphane Charpinet
  • Pierre Chayer
  • Malvina Billères
  • Suzanna K. Randall
  • Ben Dorman
Article

DOI: 10.1023/B:ASTR.0000044348.61224.de

Cite this article as:
Fontaine, G., Green, E.M., Brassard, P. et al. Astrophys Space Sci (2004) 291: 379. doi:10.1023/B:ASTR.0000044348.61224.de

Abstract

We briefly review the recent advances that have been made on the front of pulsating subdwarf B (sdB) stars. The first family of sdB pulsators, the EC 14026 stars, was discovered a few years ago and consists of short-period (∼100−200 s) p-mode variables. The second type of pulsating sdB’s consists of the PG 1716+426 stars, a group of variables showing long-period (∼1 h) g-mode pulsations. The existence of the latter was first reported less than a year ago. While the two types of sdB pulsators differ markedly in their observational characteristics, we recently found a unifying property in the sense that the observed modes in these objects are excited through the same driving process, a classic kappa mechanism associated with the radiative levitation of iron in the stellar envelope.

hot B subdwarfs stellar oscillations 

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Gilles Fontaine
    • 1
  • Elizabeth M. Green
    • 2
  • Pierre Brassard
    • 1
  • Stéphane Charpinet
    • 3
  • Pierre Chayer
    • 4
  • Malvina Billères
    • 5
  • Suzanna K. Randall
    • 1
  • Ben Dorman
    • 6
  1. 1.Département de PhysiqueUniversité de MontréalCanada
  2. 2.Steward ObservatoryUniversity of ArizonaTucsonUSA
  3. 3.Laboratoire d’astrophysique (UMR 5572)Observatoire Midi-PyrénéesToulouseFrance
  4. 4.Bloomberg Center for Physics and AstronomyJohns Hopkins UniversityBaltimoreUSA
  5. 5.European Southern ObservatorySantiego HeadquartersSantiagoChili
  6. 6.Goddard Space Flight CenterNASAGreenbeltUSA

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