A New Look into Putative Duplicity and Pulsations of the Be Star beta CMi

0511175 - ASÚ 2020 RIV US eng J - Článek v odborném periodiku
Harmanec, P. - Švanda, Michal - Korčáková, D. - Chini, R. - Nasseri, A. - Yang, S. - Božić, H. - Šlechta, Miroslav - Vanzi, L.
A New Look into Putative Duplicity and Pulsations of the Be Star beta CMi.
Astrophysical Journal. Roč. 875, č. 1 (2019), č. článku 13. ISSN 0004-637X. E-ISSN 1538-4357
Institucionální podpora: RVO:67985815
Klíčová slova: spectroscopic * individual stars * oscillations
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.746, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/ab0828

We measured the radial velocity of the outer wings of the double Ha emission in all spectra at our disposal, and were not able to confirm significant radial-velocity changes. We also discuss the problems related to the detection of very small radial-velocity changes and conclude that while it is still possible that the star is a spectroscopic binary, there is currently no convincing proof of it from the radial-velocity measurements. Wavelet analysis of the MOST photometry shows that there is only one persistent (and perhaps slightly variable) periodicity of 0(d)617 of the light variations, with a double-wave light curve. All other short periods having only transient character. Our suggestion that this dominant period is the star's rotational period agrees with the estimated stellar radius, projected rotational velocity, and with the orbital inclination derived by two teams of investigators. New spectral observations obtained in the whole-night series would be needed to find out whether some possibly real, very small radial-velocity changes cannot, in fact, be due to rapid line-profile changes.
Trvalý link: http://hdl.handle.net/11104/0301511