Issue |
A&A
Volume 413, Number 1, January I 2004
|
|
---|---|---|
Page(s) | 251 - 256 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20031527 | |
Published online | 17 December 2003 |
The diameter and evolutionary state of Procyon A
Multi-technique modeling using asteroseismic and interferometric constraints
1
European Southern Observatory, Casilla 19001, Vitacura, Santiago 19, Chile
2
Département Cassini, UMR CNRS 6529, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
3
LESIA, Observatoire de Paris-Meudon, 5, place Jules Janssen, 92195 Meudon Cedex, France
Corresponding author: P. Kervella, Pierre.Kervella@eso.org
Received:
19
May
2003
Accepted:
20
August
2003
We report the angular diameter measurement obtained with the VINCI/VLTI
instrument on the nearby star Procyon A (α CMi A, F5IV–V),
at a relative precision of ±0.9%. We obtain a uniform disk angular
diameter in the K band of mas and a limb
darkened
value of
mas.
Together with the hipparcos parallax, this gives a linear
diameter of
. We use this result in combination
with spectroscopic, photometric and asteroseismic constraints to model
this star with the CESAM code.
One set of modeling parameters that
reproduces the observations within their error bars are
an age of 2314 Myr, an initial helium mass fraction
and an initial mass ratio of heavy elements to
hydrogen
.
We also computed the adiabatic oscillation spectrum of our model of
Procyon A, giving a mean large frequency separation of
Hz. This value is in
agreement with the seismic observations by Martić et al. ([CITE],
[CITE]).
The interferometric diameter and the asteroseismic large frequency spacing
together suggest a mass closer to 1.4
than to 1.5
.
We conclude that Procyon is currently ending its life on the main sequence,
as its luminosity class indicates.
Key words: stars: individual: α CMi / stars: fundamental parameters / stars: evolution / techniques: interferometric
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.