Issue |
A&A
Volume 371, Number 2, May IV 2001
|
|
---|---|---|
Page(s) | 592 - 599 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20010360 | |
Published online | 15 May 2001 |
Period -magnitude relationships in BVIJHK-bands for fundamental mode and first overtone Cepheids
1
C.R.A.L (UMR 5574 CNRS), École Normale Supérieure, 69364 Lyon Cedex 07, France
2
Max-Planck-Institut für Astrophysik, Karl-Schwarzschildstr.1, 85748 Garching, Germany e-mail: yalibert@ens-lyon.fr
Corresponding author: I. Baraffe, ibaraffe@ens-lyon.fr
Received:
9
November
2000
Accepted:
8
March
2001
We present theoretical period -magnitude relationships for Cepheids
in different filters for fundamental and first overtone
pulsators, completing the work by Alibert et al. ([CITE]).
The results are provided for different metallicities
characteristic of the Magellanic Clouds
and the Milky Way. In contrast
to the fundamental mode, we find a small metallicity effect
on the period -luminosity relationship for the first overtone,
due to the sensitivity of the period ratio P1/P0
with metallicity.
Comparison is made with observations from OGLE and EROS
in the Small and Large Magellanic Clouds. We emphasize the
constraint on theoretical predictions
provided by the combination of both fundamental
and first overtone observed sequences.
We obtain
excellent agreement between models and data in a -WI
(Wesenheit index)
diagram for a distance modulus for the LMC
= 18.60 -18.70.
We analyse the uncertainties of the fundamental
period -magnitude relationships and the consequences
on distance determination. We show that an arbitrary shift
of the instability strip by 350 K in Teff yields up
to 0.45 mag effect on MV at a given period, whereas
the effect is less than 0.1 mag in the K-band. Using
recent near-IR observations in the Large Magellanic Cloud
and our P -MK relationship,
we derive a distance modulus for the LMC in agreement with the value
based on WI data.
Key words: stars: evolution / stars: distances / Magellanic clouds / distance and redshift
© ESO, 2001
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