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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The field high-amplitude SX Phoenicis variable BL camelopardalis: Results from a multisite photometric campaign I. Pulsation
Astronomy and Astrophysics, Volume 471, No. 1, Year 2007
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Description
Context. BL Cam is an extreme metal-deficient field high-amplitude SX Phe-type variable where a very complex frequency spectrum is detected, with a number of independent nonradial modes excited, unusual among the high-amplitude pulsators in the Lower Classical Instability Strip. Aims. An extensive and detailed study has been carried out to investigate the pulsational content and properties of this object. Methods. The analysis is based on 283 h of CCD observations obtained in the Johnson V filter, during a long multisite photometric campaign carried out along the Northern autumn-winter of 2005-2006. Additionally, multicolour BI photometry was also collected to study the phase shifts and amplitude ratios, between light curves obtained in different filters, for modal discrimination of the main excited modes. Results. The detailed frequency analysis revealed a very rich and dense pulsational content consisting of 25 significant peaks, 22 of them corresponding to independent modes: one is the already known main periodicity f0 = 25.5765 cd-1 (ΔV = 153 mmag) and the other 21 are excited modes showing very small amplitudes. Some additional periodicities are probably still remaining in the residuals. This represents the most complex spectrum ever detected in a high-amplitude pulsator of this type. The majority of the secondary modes suspected from earlier works are confirmed here and, additionally, a large number of new peaks are detected. The amplitude of the main periodicity f 0 seems to be stable during decades, but the majority of the secondary modes show strong amplitude changes from one epoch to another. The suspected fundamental radial nature of the main periodicity of BL Cam is confirmed, while the secondary peak f1 = 25.2523 cd-1 is identified as a nonradial mixed mode g4, with ℓ = 1. The radial double-mode nature, claimed by some authors for the main two frequencies of BL Cam, is not confirmed. Nevertheless, the frequency fd = 32.6464 cd-1 could correspond to the first radial overtone. © ESO 2007.
Authors & Co-Authors
Rodríguez, E.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Fauvaud, S.
France, Saint-véran
Association Astroqueyras
France
Geos Groupe Européen D'observations Stellaires
Farrell, J. A.
United States
Sulphur Flats Observatory
Zhou, Aiying
China, Beijing
National Astronomical Observatories Chinese Academy of Sciences
Sareyan, Jean Pierre
France, Nice
Observatoire de la Côte D'azur
López-González, María José
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Dupret, M. A.
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Grigahcène, Ahmed
Algeria, Algiers
Centre de Recherche en Astronomie Astrophysique et Géophysique
de Ridder, Joris
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Klingenberg, G.
Norway, Oslo
Norwegian Astronomical Society
Wolf, M.
Czech Republic, Prague
Charles University
van Cauteren, Paul
Belgium, Beersel
Beersel Hills Observatory
Lampens, Patricia
Belgium, Brussels
Royal Observatory of Belgium
Martínez, D.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Casanova, Víctor M.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Aceituno, Francisco J.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Helvaci, M.
Turkey, Ankara
Ankara Üniversitesi
Hintz, Eric G.
United States, Provo
Brigham Young University
Král, L.
Czech Republic, Ostrava
Vsb – Technical University of Ostrava
Fumagalli, F.
France
Geos Groupe Européen D'observations Stellaires
Simonetti, J. H.
United States, Blacksburg
Virginia Polytechnic Institute and State University
Granslo, B. H.
Norway, Oslo
Norwegian Astronomical Society
Kotková, L.
Czech Republic, Ondrejov
Astronomical Institute, Academy of Sciences of the Czech Republic V.v.i.
Santacana, G.
France, Saint-véran
Association Astroqueyras
Michelet, J.
France, Lyon
Club D'astronomie Lyon Ampère
Fauvaud, M.
France, Saint-véran
Association Astroqueyras
Vugnon, J. M.
France, Paris
Club Eclipse
Sadsaoud, H.
Algeria, Algiers
Centre de Recherche en Astronomie Astrophysique et Géophysique
Aliouane, S.
Algeria, Algiers
Centre de Recherche en Astronomie Astrophysique et Géophysique
Grigahcéne, Z. C.
Algeria, Algiers
Centre de Recherche en Astronomie Astrophysique et Géophysique
Martín-Ruiz, Susana
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Amado, Pedro J.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Suárez, J. C.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Moya, A.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Kuc̀áková, Hana
Czech Republic, Ostrava
Vsb – Technical University of Ostrava
Kocián, R.
Czech Republic, Ostrava
Vsb – Technical University of Ostrava
Truparová, K.
Czech Republic, Ostrava
Vsb – Technical University of Ostrava
Avdibegovic̀, A.
Czech Republic, Prague
Charles University
Blazek, Martin
Czech Republic, Prague
Charles University
Kliner, J.
Czech Republic, Prague
Charles University
Zasche, Petr
Czech Republic, Prague
Charles University
Vilásek, M.
Czech Republic, Ostrava
Vsb – Technical University of Ostrava
Bartošíková, S.
Czech Republic, Ostrava
Vsb – Technical University of Ostrava
Yaşarsoy, B.
Turkey, Izmir
Ege Üniversitesi
Ulusoy, Ceren
Turkey, Izmir
Ege Üniversitesi
Graham, Keith A.
United States, Cambridge
American Association of Variable Star Observers
Nicholson, M. P.
United States, Cambridge
American Association of Variable Star Observers
Trondal, O.
Norway, Oslo
Norwegian Astronomical Society
Yesilyaprak, C.
Turkey, Antalya
Akdeniz Üniversitesi
Coker, D.
Turkey, Ankara
Ankara Üniversitesi
Statistics
Citations: 50
Authors: 50
Affiliations: 23
Identifiers
Doi:
10.1051/0004-6361:20077514
ISSN:
00046361
e-ISSN:
14320746