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dc.creatorZwintz, K.en_US
dc.creatorLenz, P.en_US
dc.creatorBreger, M.en_US
dc.creatorPamyatnykh, A. A.en_US
dc.creatorZdravkov, T.en_US
dc.creatorKuschnig, R.en_US
dc.creatorMatthews, J. M.en_US
dc.creatorGuenther, D. B.en_US
dc.creatorMoffat, A. F. J.en_US
dc.creatorRowe, J. F.en_US
dc.creatorRucinski, S. M.en_US
dc.creatorSasselov, D.en_US
dc.creatorWeiss, W. W.en_US
dc.date.accessioned2016-04-22T19:48:35Z
dc.date.available2016-04-22T19:48:35Z
dc.date.issued2011-09en
dc.identifierdoi:10.15781/T2QJ7R
dc.identifier.citationZwintz, K., P. Lenz, M. Breger, A. A. Pamyatnykh, T. Zdravkov, R. Kuschnig, J. M. Matthews et al. >Regular frequency patterns in the classical δ Scuti star HD 144277 observed by the MOST satellite.> Astronomy & Astrophysics, Vol. 533 (Sep., 2011): A133.en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/2152/34550
dc.description.abstractContext. We present high-precision time-series photometry of the classical delta Scuti star HD 144277 obtained with the MOST (Microvariability and Oscillations of STars) satellite in two consecutive years. The observed regular frequency patterns are investigated asteroseismologically. Aims. HD 144277 is a hot A-type star that is located on the blue border of the classical instability strip. While we mostly observe low radial order modes in classical delta Scuti stars, HD 144277 presents a different case. Its high observed frequencies, i.e., between 59.9 d(-1) (693.9 mu Hz) and 71.1 d(-1) (822.8 mu Hz), suggest higher radial orders. We examine the progression of the regular frequency spacings from the low radial order to the asymptotic frequency region. Methods. Frequency analysis was performed using Period04 and SigSpec. The results from the MOST observing runs in 2009 and 2010 were compared to each other. The resulting frequencies were submitted to asteroseismic analysis. Results. HD 144277 was discovered to be a delta Scuti star using the time-series photometry observed by the MOST satellite. Twelve independent pulsation frequencies lying in four distinct groups were identified. Two additional frequencies were found to be combination frequencies. The typical spacing of 3.6 d(-1) corresponds to the spacing between subsequent radial and dipole modes, therefore the spacing between radial modes is twice this value, 7.2 d(-1). Based on the assumption of slow rotation, we find evidence that the two radial modes are the sixth and seventh overtones, and the frequency with the highest amplitude can be identified as a dipole mode. Conclusions. The models required to fit the observed instability range need slightly less metallicity and a moderate enhancement of the helium abundance compared to the standard chemical composition. Our asteroseismic models suggest that HD 144277 is a delta Scuti star close to the ZAMS with a mass of 1.66 M(circle dot).en_US
dc.description.sponsorshipPolish MNiSW N N203 379 636en_US
dc.description.sponsorshipAustrian Fonds zur Forderung der wissenschaftlichen Forschung P21830-N16, P22691-N16en_US
dc.description.sponsorshipAustrian Academy of Sciences at the Institute of Astronomy of the University of Viennaen_US
dc.language.isoEnglishen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectstars: oscillationsen_US
dc.subjecttechniques: photometricen_US
dc.subjectasteroseismologyen_US
dc.subjectstars:en_US
dc.subjectvariables: delta scutien_US
dc.subjectstars: individual: hd 144277en_US
dc.subjectrapidly rotating starsen_US
dc.subjectspaceen_US
dc.subjectopacitiesen_US
dc.subjectphotometryen_US
dc.subjectpulsationen_US
dc.subjectvariablesen_US
dc.subjectspectraen_US
dc.subjectclusteren_US
dc.subjectmodesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleRegular Frequency Patterns In The Classical Delta Scuti Star HD 144277 Observed By The MOST Satelliteen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.doi10.1051/0004-6361/201117272en_US
dc.contributor.utaustinauthorBreger, M.en_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US


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