The classification of frequencies in the gamma Doradus/delta Scuti hybrid star HD 49434

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dc.contributor.authorBrunsden, E.
dc.contributor.authorPollard, K.R.
dc.contributor.authorCottrell, P.L.
dc.contributor.authorWright, D.J.
dc.contributor.authorDe Cat, P.
dc.contributor.authorUytterhoeven, K.
dc.date.accessioned2015-09-28T22:54:43Z
dc.date.available2015-09-28T22:54:43Z
dc.date.issued2015en
dc.description.abstractHybrid stars of the γ Doradus and δ Scuti pulsation types have great potential for asteroseismic analysis to explore their interior structure. To achieve this, mode identifications of pulsational frequencies observed in the stars must be made, a task which is far from simple. In this work we begin the analysis by scrutinizing the frequencies found in the CoRoT photometric satellite measurements and ground-based high-resolution spectroscopy of the hybrid star HD 49434. The results showalmost no consistency between the frequencies found using the two techniques and no characteristic period spacings or couplings were identified in either data set. The spectroscopic data additionally show no evidence for any long-term (5 yr) variation in the dominant frequency. The 31 spectroscopic frequencies identified have standard deviation profiles suggesting multiple modes sharing (l, m) in the δ Scuti frequency region and several skewed modes sharing the same (l, m) in the γ Doradus frequency region. In addition, there is a clear frequency in the γ Doradus frequency region that appears to be unrelated to the others. We conclude HD 49434 remains a δ Scuti/γ Doradus candidate hybrid star but more sophisticated models dealingwith rotation are sought to obtain a clear picture of the pulsational behaviour of this star.en
dc.identifier.citationBrunsden, E., Pollard, K.R., Cottrell, P.L, Uytterhoeven, K., Wright, D.J., De Cat, P. (2015) The classification of frequencies in the gamma Doradus/delta Scuti hybrid star HD 49434. Monthly Notices of the Royal Astronomical Society,, 447, pp. 2970-2980.en
dc.identifier.doihttps://doi.org/10.1093/mnras/stu2615
dc.identifier.urihttp://hdl.handle.net/10092/10997
dc.language.isoen
dc.publisherUniversity of Canterbury. Physics and Astronomyen
dc.rights.urihttps://hdl.handle.net/10092/17651en
dc.subjectline: profilesen
dc.subjecttechniques: spectroscopicen
dc.subjectstars: individual: HD 49434en
dc.subjectstars: oscillationsen
dc.subjectstars: variables: generalen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsen
dc.titleThe classification of frequencies in the gamma Doradus/delta Scuti hybrid star HD 49434en
dc.typeJournal Article
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