2011A&A...530A..97B


Query : 2011A&A...530A..97B

2011A&A...530A..97B - Astronomy and Astrophysics, volume 530A, 97-97 (2011/6-1)

Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265.

BALLOT J., GIZON L., SAMADI R., VAUCLAIR G., BENOMAR O., BRUNTT H., MOSSER B., STAHN T., VERNER G.A., CAMPANTE T.L., GARCIA R.A., MATHUR S., SALABERT D., GAULME P., REGULO C., ROXBURGH I.W., APPOURCHAUX T., BAUDIN F., CATALA C., CHAPLIN W.J., DEHEUVELS S., MICHEL E., BAZOT M., CREEVEY O., DOLEZ N., ELSWORTH Y., SATO K.H., VAUCLAIR S., AUVERGNE M. and BAGLIN A.

Abstract (from CDS):

The star HD 52265 is a G0V metal-rich exoplanet-host star observed in the seismology field of the CoRoT space telescope from November 2008 to March 2009. The satellite collected 117 days of high-precision photometric data on this star, showing that it presents solar-like oscillations. HD 52265 was also observed in spectroscopy with the Narval spectrograph at the same epoch. We characterise HD 52265 using both spectroscopic and seismic data. The fundamental stellar parameters of HD 52265 were derived with the semi-automatic software VWA, and the projected rotational velocity was estimated by fitting synthetic profiles to isolated lines in the observed spectrum. The parameters of the observed p modes were determined with a maximum-likelihood estimation. We performed a global fit of the oscillation spectrum, over about ten radial orders, for degrees l=0 to 2. We also derived the properties of the granulation, and analysed a signature of the rotation induced by the photospheric magnetic activity. Precise determinations of fundamental parameters have been obtained: Teff=6100±60K, logg=4.35±0.09, [M/H]=0.19±0.05, as well as vsini=3.6+0.3–1.0km/s. We have measured a mean rotation period Prot=12.3±0.15days, and find a signature of differential rotation. The frequencies of 31 modes are reported in the range 1500-2550µHz. The large separation exhibits a clear modulation around the mean value <Δν≥98.3±0.1µHz. Mode widths vary with frequency along an S-shape with a clear local maximum around 1800µHz. We deduce lifetimes ranging between 0.5 and 3 days for these modes. Finally, we find a maximal bolometric amplitude of about 3.96±0.24ppm for radial modes.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 52265 - asteroseismology - stars: fundamental parameters - stars: rotation - stars: solar-type

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * iot Hor PM* 02 42 33.4666679022 -50 48 01.055138166   5.97 5.40     F8V 392 1
2 HD 46375 PM* 06 33 12.6224391648 +05 27 46.528531452   8.70 7.84     G9V 234 2
3 HD 49385A PM* 06 48 11.5030769640 +00 18 17.894873196   7.952 7.399 8.28   G0V 87 1
4 HD 49933 PM* 06 50 49.8309774552 -00 32 27.167495244   6.147 5.771 7.04   F3V 379 2
5 HD 52265 PM* 07 00 18.0357115416 -05 22 01.780929120   6.845 6.282     G0V 328 1
6 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 529 2
7 Kepler-1b Pl 19 07 14.0375836512 +49 18 59.091482160           ~ 330 2
8 BD+47 2846 Er* 19 28 59.3538826128 +47 58 10.217007804   10.97 10.48     F6V 306 2
9 BD+47 2936 EB* 19 50 50.2472976936 +48 04 51.101390496       8.8   K4V 299 2

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