Asteroseismology of Procyon A with SARG at TNG

Free access article

Issue		A&A Volume 429, Number 1, January I 2005


Page(s)		L17 - L20
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200400106

A&A 429, L17-L20 (2005)
DOI: 10.1051/0004-6361:200400106

Letter

Asteroseismology of Procyon A with SARG at TNG

R. U. Claudi¹, A. Bonanno², S. Leccia³, R. Ventura², S. Desidera¹, R. Gratton¹, R. Cosentino², L. Paternò³ and M. Endl⁴

¹ INAF - Oss. Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy
    e-mail: [claudi;desidera;gratton]@pd.astro.it
² INAF - Oss. Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
    e-mail: [abo;rve;rco]@ct.astro.it
³ Dipartimento di Fisica ed Astronomia, Università di Catania, via S. Sofia 78, 95123 Catania, Italy
    e-mail: leccia@na.astro.it;lpaterno@ct.astro.it
⁴ McDonald Observatory, The university of Texas at Austin, Austin, TX 78712, USA
    e-mail: mike@astro.as.texas.edu

(Received 1 October 2004 / Accepted 17 November 2004 )

Abstract
We present high precision radial velocity measurements on the F5 IV star $\alpha$ CMi obtained by the SARG spectrograph at TNG (Telescopio Nazionale Galileo) exploiting the iodine cell technique. The time series of about 950 spectra of Procyon A taken during 6 observation nights are affected by an individual error of $1.3\,\rm m\,s^{-1}$ . Thanks to the iodine cell technique, the spectrograph contribution to the Doppler shift measurement error is quite negligible and our error is dominated by the photon statistics (Brown et al. 1994). An excess of power between 0.5 and 1.5 mHz, detected also by Martic et al. (2004) has been found. We determined a large separation frequency $\Delta\nu_0 = 56\pm 2\,\mu\rm {Hz}$ , consistent with both theoretical estimates Chaboyer et al. 1999) and previous observations (Martic et al. 2004).

Key words: asteroseismology -- solar-like oscillations -- Procyon A -- techniques: radial velocities

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