Query : 2001A&A...371..592B

2001A&A...371..592B - Astronomy and Astrophysics, volume 371, 592-599 (2001/5-4)

Period - magnitude relationships in (BVIJHK)-bands for fundamental mode and first overtone Cepheids.


Abstract (from CDS):

We present theoretical period - magnitude relationships for Cepheids in different filters for fundamental and first overtone pulsators, completing the work by Alibert et al. (1999A&A...344..551A). 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 logP-WI (Wesenheit index) diagram for a distance modulus for the LMC µ0=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 350K in Teff yields up to 0.45mag 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.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: distances - Magellanic clouds - distance and redshift

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 - 2023
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10848 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16987 1

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