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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Follow-up observations of pulsating subdwarf B stars: Multisite campaigns on PG 1618+563B and PG 0048+091
Astrophysical Journal, Volume 664, No. 1 I, Year 2007
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Description
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 PG1618+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. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Reed, Michael D.
United States, Springfield
Missouri State University
O'Toole, Simon J.
Australia, Eastwood
Anglo Australian Observatory
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Terndrup, Donald M.
United States, Columbus
The Ohio State University
Eggen, Joesph R.
United States, Springfield
Missouri State University
Zhou, Aiying
United States, Springfield
Missouri State University
An, Deokkeun
United States, Columbus
The Ohio State University
Chen, Chinwei
Taiwan, Taoyuan
National Central University
Chen, Wenping
Taiwan, Taoyuan
National Central University
Lin, Hungchin
Taiwan, Taoyuan
National Central University
Akan, C.
Turkey, Izmir
Ege Üniversitesi
Çakırlı, Ömür
Turkey, Izmir
Ege Üniversitesi
Worters, Hannah L.
South Africa, Cape Town
South African Astronomical Observatory
United Kingdom, Preston
University of Central Lancashire
Kilkenny, D.
South Africa, Cape Town
South African Astronomical Observatory
Siwak, Michał
Poland, Krakow
Uniwersytet Jagielloński
Zoła, Stanisław
Poland, Krakow
Uniwersytet Jagielloński
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Kim, Seung-lee
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Gelven, G. A.
United States, Springfield
Missouri State University
Harms, S. L.
United States, Springfield
Missouri State University
Wolf, George W.
United States, Springfield
Missouri State University
Statistics
Citations: 19
Authors: 19
Affiliations: 11
Identifiers
Doi:
10.1086/518878
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Health System And Policy
Study Design
Cohort Study