2008A&A...488..705A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET03:32:52

2008A&A...488..705A - Astronomy and Astrophysics, volume 488, 705-714 (2008/9-3)

CoRoT sounds the stars: p-mode parameters of Sun-like oscillations on HD 49933.

APPOURCHAUX T., MICHEL E., AUVERGNE M., BAGLIN A., TOUTAIN T., BAUDIN F., BENOMAR O., CHAPLIN W.J., DEHEUVELS S., SAMADI R., VERNER G.A., BOUMIER P., GARCIA R.A., MOSSER B., HULOT J.-C., BALLOT J., BARBAN C., ELSWORTH Y., JIMENEZ-REYES S.J., KJELDSEN H., REGULO C. and ROXBURGH I.W.

Abstract (from CDS):

The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT on the F5V star HD 49933. The data reveal a rich spectrum of overtones of low-degree p modes. Our aim was to extract robust estimates of the key parameters of the p modes observed in the power spectrum of the lightcurve. Estimation of the mode parameters was performed using maximum likelihood estimation of the power spectrum. A global fitting strategy was adopted whereby 15 mode orders of the mode spectrum (45 modes) were fitted simultaneously. The parameter estimates that we list include mode frequencies, peak linewidths, mode amplitudes, and a mean rotational frequency splitting. We find that the average large frequency (overtone) spacing derived from the fitted mode frequencies is 85.9±0.15µHz. The frequency of maximum amplitude of the radial modes is at 1760 µHz, where the observed rms mode amplitude is 3.75±0.23ppm. The mean rotational splitting of the non-radial modes appears to be in the range ≃2.7µHz to ≃3.4µHz. The angle of inclination offered by the star, as determined by fits to the amplitude ratios of the modes, appears to be in the range ≃50degrees to ≃62degrees.

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Journal keyword(s): methods: statistical - methods: observational - stars: oscillations

Simbad objects: 4

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Number of rows : 4

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 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 336 2
2 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1778 0
3 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2088 0
4 * gam Pav PM* 21 26 26.6048372 -65 21 58.314484 4.57 4.70 4.22 3.75 3.45 F9VFe-1.4CH-0.7 381 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-03:32:52

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