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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A search for pulsations in the HgMn star HD 45975 with CoRoT photometry and ground-based spectroscopy
Astronomy and Astrophysics, Volume 561, Article A35, Year 2014
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Description
The existence of pulsations in HgMn stars is still being debated. To provide the first unambiguous observational detection of pulsations in this class of chemically peculiar objects, the bright star HD 45975 was monitored for nearly two months by the CoRoT satellite. Independent analyses of the light curve provide evidence of monoperiodic variations with a frequency of 0.7572 d-1 and a peak-to-peak amplitude of ~2800 ppm. Multisite, ground-based spectroscopic observations overlapping the CoRoT observations show the star to be a long-period, single-lined binary. Furthermore, with the notable exception of mercury, they reveal the same periodicity as in photometry in the line moments of chemical species exhibiting strong overabundances (e.g., Mn and Y). In contrast, lines of other elements do not show significant variations. As found in otherHgMn stars, the pattern of variability consists in an absorption bump moving redwards across the line profiles. We argue that the photometric and spectroscopic changes are more consistent with an interpretation in terms of rotational modulation of spots at the stellar surface. In this framework, the existence of pulsations producing photometric variations above the ~50 ppm level is unlikely in HD 45975. This provides strong constraints on the excitation/damping of pulsation modes in this HgMn star. © 2013 ESO.
Authors & Co-Authors
Morel, Thierry
Belgium, Liege
Université de Liège
Briquet, Maryline
Belgium, Liege
Université de Liège
Auvergne, Michel
France, Paris
Cnrs Centre National de la Recherche Scientifique
Alecian, Georges
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Ghazaryan, S.
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Armenia, Byurakan
Byurakan Astrophysical Observatory
Niemczura, Ewa
Poland, Wroclaw
University of Wroclaw
Fossati, Luca
Germany, Bonn
Universität Bonn
Lehmann, Holger
Germany, Camburg
Thüringer Landessternwarte Tautenburg
Hubrig, Swetlana
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Ulusoy, Ceren
South Africa, Pretoria
University of South Africa
Damerdji, Yassine
Algeria, Algiers
Centre de Recherche en Astronomie Astrophysique et Géophysique
Rainer, Monica
Italy, Merate
Osservatorio Astronomico Di Brera
Poretti, Ennio
Italy, Merate
Osservatorio Astronomico Di Brera
Borsa, Franscesco
Italy, Merate
Osservatorio Astronomico Di Brera
Italy, Varese
Università Degli Studi Dell'insubria
Scardia, Marco
Italy, Merate
Osservatorio Astronomico Di Brera
Schmid, V. S.
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
van Winckel, Hans
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
de Smedt, Kenneth
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Pápics, Péter I.
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Gameiro, Jorge Filipe S.
Portugal, Porto
Universidade do Porto
Waelkens, Christoffel
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Fagas, Monika
Poland, Poznan
Uniwersytet Im. Adama Mickiewicza w Poznaniu
Kamínski, K. Z.
Poland, Poznan
Uniwersytet Im. Adama Mickiewicza w Poznaniu
Dimitrov, Wojciech
Poland, Poznan
Uniwersytet Im. Adama Mickiewicza w Poznaniu
Baglin, Annie
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Michel, Éric
France, Meudon
Luth - Laboratoire de L'univers et de Ses Theories
Dumortier, L.
Belgium, Brussels
Royal Observatory of Belgium
Frémat, Yves
Belgium, Brussels
Royal Observatory of Belgium
Hensberge, Herman
Belgium, Brussels
Royal Observatory of Belgium
Jorissen, Alain
Belgium, Brussels
Université Libre de Bruxelles
van Eck, Sophie
Belgium, Brussels
Université Libre de Bruxelles
Statistics
Citations: 31
Authors: 31
Affiliations: 17
Identifiers
Doi:
10.1051/0004-6361/201322289
ISSN:
00046361
e-ISSN:
14320746