Discovery of A New Class of Pulsating Stars: Gravity-Mode Pulsators among Subdwarf B Stars
By E. Green, K. Callerame, I. Seitenzahl, B. White, E. Hyde, M. Giovanni, M. Reed, G. Fontaine, R. Østensen. 2002
203 citations recorded by the source corpus.
During the course of an ongoing CCD monitoring program to investigate low-level light variations in subdwarf B (sdB) stars, we have serendipitously discovered a new class of low-amplitude, multimode sdB pulsators with periods of the order of an hour. These periods are more than a factor of 10 longer than those of previously known multimode sdB pulsators (EC 14026 stars), implying that they are due to gravity modes rather than pressure modes. The longer period pulsators are found only among cooler sdB stars, where they are surprisingly common. The iron opacity instability that drives the short-period EC 14026 stars is effective only in hot sdB stars, leaving the driving mechanism for the deeper gravity modes in cool sdB stars currently unknown. We present the first observational results for our newly identified sdB variables and discuss possible implications.
Subfields: Astronomy and Astrophysics, Geophysics
View Paper: https://www.semanticscholar.org/paper/be664c76c5e121d627bc9388c3b5352a4d167640
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In Astronomy and Astrophysics
- P. Brassard
- G. Fontaine
- A. Stankov
- G. Handler
- Pierre Bergeron
- P.-E. Tremblay
- A. Gianninas
- B. Gänsicke
Citations in the corpus
- A Driving Mechanism for the Newly Discovered Long-Period Pulsating Subdwarf B Stars (2003, methodology): “…iron opacity instability, which was so successful at explaining the properties of the EC 14026 stars, was unable to drive g-modes in sdB stars, rendering the driving mechanism in the long-period pulsators unknown (Green et al. 2003b; Fontaine, Brassard, & Charpinet 2003a; Fontaine et al. 2003b).”
- The Pulsating White Dwarf Stars (2008, background): “In the same general area of the log g- logT eff diagram, but distinctly cooler and less compact, one finds the second family of pulsating sdB stars, the longperiod variables (or V1093 Her stars) discovered even more recently by Betsy Green and her collaborators (Green et al. 2003).”
- Catalog of Galactic β Cephei Stars (2005, background): “Two rather recently discovered classes of pulsating B stars are the short-period subdwarf B variables (sdBVs), also known as EC 14026 stars (Kilkenny et al. 1997), and the long-period sdBV stars (Green et al. 2003).”