Query : 2007A&A...470.1009C

2007A&A...470.1009C - Astronomy and Astrophysics, volume 470, 1009-1012 (2007/8-2)

A search for solar-like oscillations in the Am star HD 209625.


Abstract (from CDS):

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 treatement 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 us to collect 1243 radial velocity (RV) 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 allow excitation of solar-like oscillations, or the amplitudes of the oscillations remain below 20-30cm/s (depending on their frequency range).

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: individual: HD 209625 - stars: interiors - stars: oscillations - stars: binaries: spectroscopic - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/470/1009): table.dat>

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1822 0
2 * 32 Aqr SB* 22 04 47.4224193480 -00 54 22.839762708   5.519 5.271     A5IV 175 0

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