J/A+A/470/1009 Radial velocities of HD 209625 (Carrier+, 2007)
A search for solar-like oscillations in the Am star HD 209625.
Carrier F., Eggenberger P., Leyder J.C., Debernardi Y., Royer F.
<Astron. Astrophys. 470, 1009 (2007)>
=2007A&A...470.1009C 2007A&A...470.1009C
ADC_Keywords: Stars, Am ; Binaries, spectroscopic ; Radial velocities
Keywords: stars: chemically peculiar - stars: individual: HD 209625 -
stars: interiors - stars: oscillations -
stars: binaries: spectroscopic - techniques: radial velocities
Abstract:
The goal is to test the structure of hot metallic stars, and in
particular the structure of a near-surface convection zone using
asteroseismic measurements. Indeed, stellar models including a
detailed treatment of the radiative diffusion predict the existence
of a near-surface convection zone in order to correctly reproduce the
anomalies in surface abundances that are observed in Am stars. The Am
star HD 209625 was observed with the Harps spectrograph mounted on the
3.6-m telescope at the ESO La Silla Observatory (Chile) during 9
nights in August 2005. This observing run allowed to collect 1243
radial velocity measurements, with a standard deviation of 1.35m/s.
The power spectrum associated with these RV measurements does not
present any excess. Therefore, either the structure of the external
layers of this star does not enable to excite solar-like oscillations,
or the amplitudes of the oscillations remains below 20-30cm/s
(depending of their frequency range).
Description:
Radial velocity time series of HD 209625, obtained with the
spectrograph HARPS (ESO, La Silla).
Objects:
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RA (2000) DE Designation(s)
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22 04 47.4 -00 54 23 HD 209625 = * 32 Aqr
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 37 1243 Radial velocity measurements of HD 209625
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date
19- 26 F8.5 km/s HRV Heliocentric radial velocity
31- 37 F7.5 km/s e_HRV Photon noise
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Acknowledgements:
Fabien Carrier, fabien(at)ster.kuleuven.be
(End) Patricia Vannier [CDS] 28-Apr-2007