Query : 2006A&A...459..589M

2006A&A...459..589M - Astronomy and Astrophysics, volume 459, 589-596 (2006/11-4)

An asteroseismic study of the β Cephei star β Canis Majoris.


Abstract (from CDS):

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. We determined pulsation frequencies in the SiIII 4553Å line with Fourier methods. We identified the m-value of the modes by taking the photometric identifications of the degrees l into account. To this end we used the moment method together with the amplitude and phase variations across the line profile. The frequencies of the identified modes were used for a seismic interpretation of the structure of the star. We confirm the presence of the three pulsation frequencies already detected in previous photometric datasets: f1=3.9793c/d (46.057µHz), f2=3.9995c/d (46.291µHz), and f3=4.1832c/d (48.417 µHz). For the two modes with the highest amplitudes, we unambiguously identify (l1,m1)=(2,2) and (l2,m2)=(0,0). We cannot conclude anything for the third mode identification, except that m3>0. We also deduce an equatorial rotational velocity of 31±5km/s for the star. We show that the mode f1 must be close to an avoided crossing. Constraints on the mass (13.5±0.5M), age (12.4±0.7Myr), and core overshoot (0.20±0.05HP) of β CMa are obtained from seismic modelling using f1 and f2.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: individual: β Canis Majoris - techniques: spectroscopic - stars: oscillations

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 386 0
2 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 709 0
3 V* V836 Cen bC* 14 46 25.7601403800 -37 13 20.082887904 7.04 7.88 8.05     B2 111 0

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