有哪些信誉好的足球投注网站Discovery of A New Class of Pulsating Stars Gravity-mode Pulsators among Subdwarf B Stars.pdf
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Discovery of A New Class of Pulsating Stars Gravity-mode Pulsators among Subdwarf B Stars
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Discovery of A New Class of Pulsating Stars:
Gravity-mode Pulsators among Subdwarf B Stars
E. M. Green1, G. Fontaine2, M. D. Reed3, K. Callerame1, I. R. Seitenzahl1, B. A. White1,
E. A. Hyde1, R. ?stensen4, O. Cordes5, P. Brassard2, S. Falter6, E. J. Jeffery7, S. Dreizler8,
S. L. Schuh8, M. Giovanni1, H. Edelmann6, J. Rigby1, and A. Bronowska4
egreen@
ABSTRACT
During the course of an ongoing CCD monitoring program to investigate
low-level light variations in subdwarf B (sdB) stars, we have serendipitously dis-
covered 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 ten longer than
those of previously known multimode sdB pulsators (EC14026 stars), implying
that they are due to gravity modes rather than pressure modes. The longer pe-
riod pulsators are found only among cooler sdB stars, where they are surprisingly
common. The iron opacity instability that drives the short period EC14026 stars
is effective only in hot sdB’s, leaving the driving mechanism for the deeper grav-
ity modes in cool sdB’s currently unknown. We present the first observational
results for our newly identified sdB variables, and discuss possible implications.
1Steward Observatory, University of Arizona, Tucson, AZ 85721; egreen@; caller-
ame@; irs@; bwhite@; elainahyde@; jrigby@
2De?partement de Physique, Universite? de Montre?al, CP6128, Station Centreville, Montre?al, QC H3C 3J7,
Canada; fontaine@astro.umontreal.ca; brassard@astro.umontreal.ca
3Physics, Astronomy, Material Science, SW Missouri State University, Springfield, MO 65804;
mreed@
4Isaac Newton Group of Telescopes, 37800 Santa Cruz de La Palma, Canary Islands, Spain; roy@ing.iac.es;
bronka@.pl
5Sternwarte of the University Bonn, Auf dem Huegel 71, D-53123 Bonn, Germany; ocordes@astro.uni-
bonn.de
6Dr.-Remeis-Sternwarte University Erlangen-Nu?rnberg, Sternwartstr. 7, D-96049 Bamber
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