A survey of hot subdwarf pulsators in ω Cen

S. K. Randal, A. Calamida, G. Fontaine, E. M. Green, M. Monelli, M. L. Alonso, M. Catelan, G. Bono, V. S. Dhillon, T. R. Marsh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

We recently discovered an apparently new class of pulsating Extreme Horizontal Branch (EHB) star in ω Cen. Tightly clustered around ∼50,000 K, these H-rich sdO stars exhibit rapid, multi-periodic oscillations on a timescale of 100 s. While four such objects have been detected in ω Cen, no counterparts have yet been found among the field population. Conversely, the rapid sdB pulsators around 31,000 K that are well-studied in the Galactic field have yet to be found in a globular cluster. We discuss the implications of this and also report the discovery of a fifth EHB pulsator in ω Cen.

Original languageEnglish (US)
Title of host publication40th Liege International Astrophysical Colloquium. Ageing Low Mass Stars
Subtitle of host publicationFrom Red Giants to White Dwarfs, LIAC 2012
DOIs
StatePublished - 2013
Externally publishedYes
Event40th Liege International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs, LIAC 2012 - Liege, Belgium
Duration: Jul 9 2012Jul 13 2012

Publication series

NameEPJ Web of Conferences
Volume43
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Conference

Conference40th Liege International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs, LIAC 2012
Country/TerritoryBelgium
CityLiege
Period7/9/127/13/12

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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