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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

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.citation	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.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.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	journal article	es_ES
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.identifier.idgrec	026691	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/articles/aa/pdf/2007/35/aa7414-07.pdf	en