Follow-up observations of pulsating subdwarf B stars: Multisite campaigns on PG 1618+563B and PG 0048+091
| Autor: | S. L. Harms, Seung Lee Kim, Michael D. Reed, Wen Ping Chen, Deokkeun An, Hannah L. Worters, G. A. Gelven, Michal Siwak, Ömür Çakırlı, J. R. Eggen, H. C. Lin, Donald M. Terndrup, C. Akan, Stanisław Zoła, A.-Y. Zhou, G. W. Wolf, David Kilkenny, C. W. Chen, Simon J. O'Toole |
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| Přispěvatelé: | Ege Üniversitesi |
| Rok vydání: | 2007 |
| Předmět: |
Physics
close [binaries] Astrophysics::High Energy Astrophysical Phenomena general [stars] Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics Subdwarf Asteroseismology Spectral line stars : general Stars Amplitude binaries : close Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics |
| DOI: | 10.48550/arxiv.0704.1496 |
| Popis: | WOS: 000248002400046 We present follow-up observations of pulsating subdwarf B (sdB) stars as part of our efforts to resolve the pulsation spectra for use in asteroseismological analyses. This paper reports on multisite campaigns of the pulsating sdB stars PG 1618+563B and PG 0048+091. Data were obtained from observatories placed around the globe for coverage from all longitudes. For PG 1618+563B, our five-site campaign uncovered a dichotomy of pulsation states. Early during the campaign the amplitudes and phases (and perhaps frequencies) were quite variable, while data obtained late in the campaign were able to fully resolve five stable pulsation frequencies. For PG 0048+091, our five-site campaign uncovered a plethora of frequencies with short pulsation lifetimes. We find them to have observed properties consistent with stochastically excited oscillations, an unexpected result for subdwarf B stars. We discuss our findings and their impact on subdwarf B asteroseismology. |
| Databáze: | OpenAIRE |
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