Multiperiodic pulsations in the Be stars NW Serpentis and V1446 Aquilae
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Multiperiodic pulsations in the Be stars NW Serpentis and V1446 Aquilae

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Multiperiodic pulsations in the Be stars NW Serpentis and V1446 Aquilae

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dc.contributor.author Gutiérrez Soto, Juan
dc.contributor.author Fabregat Llueca, Juan
dc.contributor.author Suso, J.
dc.contributor.author Suárez, J. C.
dc.contributor.author Moya, A.
dc.contributor.author Garrido, R.
dc.contributor.author Hubert, A.M.
dc.contributor.author Floquet, M.
dc.contributor.author Neiner, C.
dc.contributor.author Frémat, Y.
dc.date.accessioned 2010-07-13T08:08:50Z
dc.date.available 2010-07-13T08:08:50Z
dc.date.issued 2007
dc.identifier.uri http://hdl.handle.net/10550/15993
dc.description.abstract Aims.We present accurate photometric time series of two Be stars: NW Ser and V1446 Aql . Both stars were observed at the Observatorio de Sierra Nevada (Granada) in July 2003 with an automatic four-channel Strömgren photometer. We also present a preliminary theoretical study showing that the periodic variations exhibited by these stars can be due to pulsation. Methods.An exhaustive Fourier analysis together with a least-square fitting has been carried out on the time series for all four Strömgren bands. Several independent frequencies and non-periodic trends explain most of the variance. A theoretical non-adiabatic code applied to stellar models for these stars shows that g-modes are unstable. Results.Both stars show rapid variations in amplitude, probably due to a beating phenomenon. Four significant frequencies have been detected for each star. Comparison of the observed amplitude ratios for each pulsational frequency with those calculated from theoretical pulsation codes allows us to estimate the pulsation modes associated with the different detected frequencies. NW Ser seems also to show unstable p-modes and thus could be one of the newly discovered Cephei and SPB hybrid stars. Further spectroscopic observations are planned to study the stability of the detected frequencies. en
dc.language.iso en en
dc.relation http://www.aanda.org/articles/aa/pdf/2007/35/aa7414-07.pdf en
dc.source GUTIERREZ SOTO, Juan ; Fabregat Llueca, Juan ; Suso, J. ; Suárez, J.C. ; Moya, A. ; Garrido, R. ; Hubert, A.-M. ; Floquet, M. ; Neiner, C. ; Frémat, Y., 2007, Multiperiodic pulsations in the Be stars NW Serpentis and V1446 Aquilae, Astronomy and astrophysics, vol. 472, no. 2, p. 565-570 en
dc.subject Stars ; Oscillations ; Emission-line ; Be ; Individual ; NW Serpentis ; V1446 Aquilae en
dc.title Multiperiodic pulsations in the Be stars NW Serpentis and V1446 Aquilae en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia en
dc.identifier.doi 10.1051/0004-6361:20077414 en
dc.description.private Gutierrez Soto, Juan, juanguso@alumni.uv.es ; Fabregat Llueca, Juan, Juan.Fabregat@uv.es en
dc.identifier.idgrec 026691 en

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