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The field high-amplitude SX Phoenicis variable BL Camelopardalis: results from a multisite photometric campaign

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dc.contributorVirginia Techen
dc.contributor.authorRodriguez, E.en
dc.contributor.authorFauvaud, S.en
dc.contributor.authorFarrell, J. A.en
dc.contributor.authorZhou, A. Y.en
dc.contributor.authorSareyan, J. P.en
dc.contributor.authorLopez-Gonzalez, M. J.en
dc.contributor.authorDupret, M. A.en
dc.contributor.authorGrigahcene, A.en
dc.contributor.authorde Ridder, J.en
dc.contributor.authorKlingenberg, G.en
dc.contributor.authorWolf, M.en
dc.contributor.authorVan Cauteren, P.en
dc.contributor.authorLampens, P.en
dc.contributor.authorMartinez, D.en
dc.contributor.authorCasanova, V. M.en
dc.contributor.authorAceituno, F. J.en
dc.contributor.authorHelvaci, M.en
dc.contributor.authorHintz, E. G.en
dc.contributor.authorKral, L.en
dc.contributor.authorFumagalli, F.en
dc.contributor.authorSimonetti, John H.en
dc.contributor.authorGranslo, B. H.en
dc.contributor.authorKotkova, L.en
dc.contributor.authorSantacana, G.en
dc.contributor.authorMichelet, J.en
dc.contributor.authorFauvaud, M.en
dc.contributor.authorVugnon, J. M.en
dc.contributor.authorSadsaoud, H.en
dc.contributor.authorAliouane, A.en
dc.contributor.authorGrigahcene, Z. C.en
dc.contributor.authorMartin-Ruiz, S.en
dc.contributor.authorAmado, P. J.en
dc.contributor.authorSuarez, J. C.en
dc.contributor.authorMoya, A.en
dc.contributor.authorKucakova, H.en
dc.contributor.authorKocian, R.en
dc.contributor.authorTruparova, B.en
dc.contributor.authorAvdibegtovic, A.en
dc.contributor.authorBlazek, M.en
dc.contributor.authorKliner, J.en
dc.contributor.authorZasche, P.en
dc.contributor.authorVilasek, M.en
dc.contributor.authorBartosikova, S.en
dc.contributor.authorYasarsoy, B.en
dc.contributor.authorUlusoy, C.en
dc.contributor.authorGraham, K. A.en
dc.contributor.authorNicholson, M. P.en
dc.contributor.authorTrondal, O.en
dc.contributor.authorYesilyaprak, C.en
dc.contributor.authorCoker, D.en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-05-08en
dc.date.accessioned2014-05-14T17:03:33Zen
dc.date.available2014-05-14T17:03:33Zen
dc.date.issued2007-08en
dc.description.abstractContext. 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 f(0) = 25.5765 cd(-1) (Delta V = 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 f(1) = 25.2523 cd(-1) is identified as a nonradial mixed mode g(4) 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 f(6) = 32.6464 cd(-1) could correspond to the first radial overtone.en
dc.description.sponsorshipJunta de Andalucía, the Spanish Dirección General de Investigación (DGI) under projects AYA2006-06375 and ESP2004-03855-C03-01en
dc.description.sponsorshipGrant Agency of the Czech Republic, grant No.205/06/0217en
dc.description.sponsorshipEuropean Social Funden
dc.description.sponsorshipBelgian National Lotteryen
dc.description.sponsorshipTurkish National Observatoryen
dc.description.sponsorshipGrant Agency of the Czech Republic, grant No.205/06/0217en
dc.description.sponsorshipEuropean Social Funden
dc.description.sponsorshipBelgian National Lotteryen
dc.description.sponsorshipTurkish National Observatoryen
dc.identifier.citationRodriguez, E. et al., "The field high-amplitude SX Phoenicis variable BL Camelopardalis: results from a multisite photometric campaign," A&A 471, 255-264 (2007). DOI: 10.1051/0004-6361:20077514en
dc.identifier.doihttps://doi.org/10.1051/0004-6361:20077514en
dc.identifier.issn0004-6361en
dc.identifier.urihttp://hdl.handle.net/10919/48018en
dc.identifier.urlhttp://www.aanda.org/articles/aa/abs/2007/31/aa7514-07/aa7514-07.htmlen
dc.language.isoen_USen
dc.publisherEDP SCIENCESen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectstars : variables : delta scten
dc.subjectstars : individual : bl camelopardalisen
dc.subjectstars : oscillationsen
dc.subjecttechniques : photometricen
dc.subjectdelta-scuti starsen
dc.subjectsct starsen
dc.subjectpulsationen
dc.subjectasteroseismologyen
dc.subjectfrequenciesen
dc.subjectastronomy & astrophysicsen
dc.titleThe field high-amplitude SX Phoenicis variable BL Camelopardalis: results from a multisite photometric campaignen
dc.title.serialAstronomy & Astrophysicsen
dc.typeArticle - Refereeden

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