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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A multisite photometric study of two unusual β Cep stars: The magnetic V2052 Oph and the massive rapid rotator V986 Oph
Monthly Notices of the Royal Astronomical Society, Volume 424, No. 3, Year 2012
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Description
We report a multisite photometric campaign for the β Cep stars V2052 Oph and V986 Oph. 670h of high-quality differential photoelectric Strömgren, Johnson and Geneva time-series photometry was obtained with eight telescopes on five continents during 182 nights. Frequency analyses of the V2052 Oph data enabled the detection of three pulsation frequencies, the first harmonic of the strongest signal, and the rotation frequency with its first harmonic. Pulsational mode identification from analysing the colour amplitude ratios confirms the dominant mode as being radial, whereas the other two oscillations are most likely l = 4. Combining seismic constraints on the inclination of the rotation axis with published magnetic field analyses we conclude that the radial mode must be the fundamental mode. The rotational light modulation is in phase with published spectroscopic variability, and consistent with an oblique rotator for which both magnetic poles pass through the line of sight. The inclination of the rotation axis is 54° < i < 58° and the magnetic obliquity 58° < β < 66°. The possibility that V2052 Oph has a magnetically confined wind is discussed. The photometric amplitudes of the single oscillation of V986 Oph are most consistent with an l = 3 mode, but this identification is uncertain. Additional intrinsic, apparently temporally incoherent light variations of V986 Oph are reported. Different interpretations thereof cannot be distinguished at this point, but this kind of variability appears to be present in many OB stars. The prospects of obtaining asteroseismic information for more rapidly rotating β Cep stars, which appear to prefer modes of higher l, are briefly discussed. © 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS.
Authors & Co-Authors
Handler, Gerald
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Shobbrook, Robert R.
Australia, Canberra
The Australian National University
Uytterhoeven, Katrienu
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Briquet, Maryline
Belgium, Liege
Université de Liège
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Neiner, Coralie
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Tshenye, T.
South Africa, Potchefstroom
North-west University
Ngwato, B.
South Africa, Potchefstroom
North-west University
van Winckel, Hans
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Guggenberger, Elisabeth
Austria, Vienna
Universität Wien
Raskin, Gert
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Rodríguez, E.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Mazumdar, Anwesh
India, Mumbai
Tata Institute of Fundamental Research, Mumbai
Barban, Caroline
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Lorenz, D.
Austria, Vienna
Universität Wien
Vandenbussche, Bart K.
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Şahin, Timur
Turkey, Antalya
Akdeniz Üniversitesi
Turkey, Kavaklidere
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Medupe, Thebe Rodney
South Africa, Potchefstroom
North-west University
Aerts, Conny
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Statistics
Citations: 21
Authors: 18
Affiliations: 13
Identifiers
Doi:
10.1111/j.1365-2966.2012.21414.x
ISSN:
00358711
e-ISSN:
13652966