Asteroseismology of the ß Cephei star ? Eridani - III. Extended frequency analysis and mode identification

Autor(en)

Joris De Ridder, John H. Telting, Luis A. Balona, Gerald Handler, Maryline Briquet, J Daszynska-Daszkiewicz, K Lefever, Andreas J. Korn, Ulrike Heiter, Conny Aerts

Abstrakt

Using the large photometric and spectroscopic data sets of the ? Eridani multisite campaign given in our two recent papers (Aerts et al. and Handler et al.), we present an extended frequency analysis and a photometric mode identification. For the extended frequency analysis, we used an improved radial velocity time series, the second-moment time series and the line profiles themselves. In the radial velocity time series, we can now detect an additional pulsation frequency that was previously only found in photometric time series. We also report several new candidate pulsation frequencies. For seven frequencies, the photometric mode identification indicates that they belong to a radial mode and six dipole modes, and for three frequencies the degree l could not be unambiguously determined. We also placed ? Eri in the Hertzsprung-Russell diagram by determining Teff using Geneva plus Strošmgren photometric calibrations, spectral energy distribution fitting, by non-local thermodynamic equilibrium hydrogen, helium and silicon line profile fitting, and by determining log(L/L?) using the Hipparcos parallax and an Hß calibration.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Katholieke Universiteit Leuven, Nordic Optical Telescope, South African Astronomical Observatory (SAAO), Uniwersytet Wrocławski, Uppsala University

Journal

Monthly Notices of the Royal Astronomical Society

Band

351

Seiten

324-332

Anzahl der Seiten

9

ISSN

0035-8711

Publikationsdatum

2004

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/7b635f74-5127-45b5-b600-44afbb43c057