2008A&A...490.1109M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:02:55

2008A&A...490.1109M - Astronomy and Astrophysics, volume 490, 1109-1120 (2008/11-2)

The detection of the rich p-mode spectrum and asteroseismology of Przybylski's star.

MKRTICHIAN D.E., HATZES A.P., SAIO H. and SHOBBROOK R.R.

Abstract (from CDS):

We investigate the oscillation spectrum of the most chemically-peculiar star in the sky, the rapidly-oscillating magnetic (roAp) star HD 101065. High-precision radial velocity (RV) measurements, spanning four consecutive nights on 3-6 March, 2004, were obtained with the HARPS echelle-spectrometer at the ESO 3.6-m telescope, and photometric data were acquired during 6 nights of observations at the 24-inch telescope of Siding Spring Observatory. The RVs were measured using all spectral lines in the wavelength range 4400-5100Å. We detected a rich spectrum of oscillation modes with semi-amplitudes ranging between 217m/s and 1.6m/s. These belong to the complete spectrum of high-order, low l=0-2 modes, having a large spacing of <Δν≥64.07±0.9µHz. We calculated the nonadiabatic frequencies of axisymmetric high-order p-modes for main-sequence models with dipole magnetic fields of two chemical compositions (X,Z)=(0.7,0.02) and (X,Z)=(0.695,0.025). The former composition provided the best fit model and yielded stellar parameters of mass, M=1.525±0.025M, age=(1.5±0.1)x109yr, effective temperature log Te=3.821±0.006, luminosity logL/L=0.797±0.026, surface gravity logg=4.06±0.04, and polar magnetic field strength, Bp=8.7±0.3kG. We are able to identify the modes of all detected oscillation frequencies. The photometric U and B light curves have maxima that precede the RV maximum by 0.16-0.19 in phase.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: oscillations - stars: individual: HD 101065

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* DO Eri a2* 03 55 16.1314636284 -12 05 56.729555672 6.35 6.32 6.00     A9VpSrEuCr 382 0
2 HD 101066 PM* 11 37 31.7295728300 -47 18 16.977969233   8.12 7.81     F2IV/V 14 0
3 V* V816 Cen dS* 11 37 37.0411005456 -46 42 34.875395453 8.99 8.79 8.03     F8/G0p 298 0
4 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 661 0
5 * del Nor * 16 06 29.4634642900 -45 10 23.665968742   4.951 4.713     kA3hA7mF0III: 72 0
6 * gam Equ a2* 21 10 20.5001160337 +10 07 53.682085548 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 522 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:02:55

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