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A multi-site campaign on the long period variable subdwarf b star PG 1627+017 |
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| Authors: | Suzanna Randall Gilles Fontaine Elizabeth Green Dave Kilkenny Lisa Crause Oliver Cordes Simon O’Toole Lázló Kiss Bi-Qing For Pierre-Olivier Quirion |
| Institution: | 1. Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, Canada, H3C 3J7 2. Steward Observatory, University of Arizona, Tucson, AZ, 85721, USA 3. South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa 4. Sternwarte der Universit?t Bonn, Auf dem Hügel 71, 53121, Bonn, Germany 5. Dr. Remeis Sternwarte, Astronomisches Institut der Universit?t Erlangen-Nürnberg, Sternwartstr. 7, 96049, Bamberg, Germany 6. School of Physics, University of Sydney, Sydney, 2006, Australia |
| Abstract: | We report on the outcome of the first major multi-site campaign on a long-period variable subdwarf B star. The target PG 1627+017 was observed for a total of 334 h during April/May/June 2003 from the lynchpin observatory at Mt. Bigelow, Arizona, with important contributions coming from co-observations at SAAO, Calar Alto and Siding Spring. Preliminary analysis indicates the presence of 8–10 probable periods in the range ～4500 to ～8900 s with relative amplitudes between 0.1 and 0.5%;. The range over which the periods are found is in qualitative agreement with theoretical predictions and the number of periods found shows potential for an in-depth asteroseismological analysis. Multi-colour observations show that the relative amplitudes of pulsation are larger in the U-band than in the R, which again is in agreement with theory. However, more multi-colour observations are needed to be able to make statements at the quantitative level. |
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