An asteroseismic study of the β Cephei star β Canis Majoris

  title={An asteroseismic study of the $\beta$ Cephei star $\beta$ Canis Majoris},
  author={Anwesh Mazumdar and Maryline Briquet and Maarten Desmet and Conny Aerts},
  journal={Astronomy and Astrophysics},
Aims. We present the results of a detailed analysis of 452 ground-based, high-resolution high S/N spectroscopic measurements spread over 4.5 years for β Canis Majoris with the aim of determining the pulsational characteristics of this star, and then using them to derive seismic constraints on the stellar parameters. Methods. We determined pulsation frequencies in the Si III 4553 A line with Fourier methods. We identified the m-value of the modes by taking the photometric identifications of the… 

Figures and Tables from this paper

An asteroseismic study of the β Cephei star 12 Lacertae: multisite spectroscopic observations, mode identification and seismic modelling

We present the results of a spectroscopic multisite campaign for the β Cephei star 12 (DD) Lacertae. Our study is based on more than thousand high-resolution high S/N spectra gathered with eight

An asteroseismic study of the β Cephei star θ Ophiuchi: constraints on global stellar parameters and core overshooting

We present a seismic study of the β Cephei star θ Ophiuchi. Our analysis is based on the observation of one radial mode, one rotationally split � = 1 triplet and three components of a rotationally

Multisite spectroscopic seismic study of the β Cep star V2052 Ophiuchi: inhibition of mixing by its magnetic field

We used extensive ground-based multisite and archival spectroscopy to derive observational constraints for a seismic modelling of the magnetic β Cep star V2052 Ophiuchi. The line-profile variability

CoRoT high-precision photometry of the B0.5 IV star HD 51756

Context. OB stars are important constituents for the ecology of the Universe, and there are only a few studies on their pulsational properties detailed enough to provide important feedback on current

Variability of OB stars from TESS southern Sectors 1–13 and high-resolution IACOB and OWN spectroscopy

Context. The lack of high-precision long-term continuous photometric data for large samples of stars has impeded the large-scale exploration of pulsational variability in the OB star regime. As a

Ground-based observations of the β Cephei CoRoT main target HD 180 642: abundance analysis and mode identification

The known β Cephei star HD 180 642 was observed by the CoRoT satellite in 2007. From the very high-precision light curve, its pulsation frequency spectrum could be derived for the first time

Spectroscopic determination of the fundamental parameters of 66 B-type stars in the field-of-view of the CoRoT satellite

Aims. We determine the fundamental parameters of a sample of B stars with apparent visual magnitudes brighter than 8 in the fieldof-view of the CoRoT space mission, from high-resolution spectroscopy.

New Beta Cephei Stars from the KELT Project

We present the results of a search for Galactic β Cephei stars, which are massive pulsating stars with both pressure modes and mixed modes. Thus, these stars can serve as benchmarks for seismological

Asteroseismology and interferometry

Current limitations to asteroseismic studies are discussed, including difficulties in mode identification and in the accurate determination of global parameters of pulsating stars, and how interferometric observations may contribute to overcome these limitations are discussed.

Rotation and convective core overshoot in θ Ophiuchi

Context. Recent work on several β Cephei stars has succeeded in constraining both their interior rotation profile and their convec- tive core overshoot. In particular, a recent study focusing on θ



Asteroseismology of the β Cephei star ν Eridani: interpretation and applications of the oscillation spectrum

The oscillation spectrum of v Eri is the richest known for any variable of the β Cephei type. We interpret the spectrum in terms of normal mode excitation and construct seismic models of the star.

Asteroseismology of the β Cephei star ν Eridani: massive exploration of standard and non-standard stellar models to fit the oscillation data

We present the results of a detailed seismic modelling of the Cephei star Eridani with the Li‘ ege evolution and pulsation codes. We selected four clearly detected, well-identified and independent

δ Ceti Is Not Monoperiodic: Seismic Modeling of a β Cephei Star from MOST Space-based Photometry

The β Cephei star δ Ceti was considered one of the few monoperiodic variables in its class. Despite (or perhaps because of) its apparently simple oscillation spectrum, it has been challenging and

Spectroscopic mode identification for the beta Cephei star EN(16) Lacertae

We perform for the first time spectroscopic mode identification in the eclipsing binary β Cephei star EN (16) Lac. This mode identification is based upon a time series of 942 line profiles of the He

Line-profile variability in the beta Cephei star epsilon Centauri

We present an analysis of 530 high-resolution spectra of the p Cephei star e Cen, showing complex variations in the rotationally broadened absorption line-profiles of the SiIII triplet (λ 4552, 4567,

Asteroseismology of the $\beta$ Cep star HD 129929 - II. Seismic constraints on core overshooting, internal rotation and stellar parameters

We perform a detailed seismic study of the β Cep star HD 129929. Our analysis is based on the recent derivation of six pulsation frequencies. These frequencies are unambiguously identified from the

Photometric studies of three multiperiodic β Cephei stars: β CMa, 15 CMa and KZ Mus

We have carried out single and multisite photometry of the three β Cephei stars β and 15 CMa as well as KZ Mus. For the two stars in CMa, we obtained 270 h of measurement in the Stromgren uvy and

Asteroseismology of HD 129929: Core Overshooting and Nonrigid Rotation

High-quality multicolor Geneva photometric data taken over 21 years of the B3Vstar HD 129929 detect six frequencies, among which appear the effects of rotational splitting with a spacing of ∼0.0121 cycles per day, which implies that the star rotates very slowly.

The Radial Velocity of Canis Majoris

In 1908 Albrecht, at the Lick Observatory, discovered that the radial velocity of ß Canis Majoris was variable in a period of approximately 0.25 day. In 1917-1918 Henroteau, at the Lick Observatory,

Statistics of the Instability Strip of β Cephei Stars

We present a study of the beta Cephei instability strip based on a sample of 49 stars of this type. After deriving their effective temperatures and luminosities from their observed (B - V), (U - B)