2001A&A...373..164B


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.23CEST03:02:07

2001A&A...373..164B - Astronomy and Astrophysics, volume 373, 164-172 (2001/7-1)

Cepheid mass-luminosity relations from the Magellanic Clouds.

BEAULIEU J.P., BUCHLER J.R. and KOLLATH Z.

Abstract (from CDS):

The OGLE data base is used in conjunction with Kurucz atmosphere models to generate sets of period, effective temperature and luminosity for fundamental and overtone Magellanic Cloud Cepheids. The Florida pulsation code (with linear turbulent convection) is then used to compute masses for these stars, assuming an average composition of (X=0.716, Z=0.010) for the LMC and of (X=0.726, Z=0.004) for the SMC. The average M-L relation for the fundamental Cepheids matches closely that for the first overtone Cepheids for each Magellanic Cloud. Neither the SMC nor the LMC average Log M-Log L relations are straight, but have a noticeable curvature. In view of the uncertainties in distance and reddening we have adopted three different choices for these quantities. The results based on the ``long'' distance scale to the clouds give a better agreement between theory and and observations than the ``short'' one. All the current evolutionary tracks predict systematically larger masses for given luminosities than our observationally derived ones, especially at the high end. Moreover, our study confirms that the evolutionary tracks of the low mass stars in SMC are not in agreement with the observations as they do not extend sufficiently blueward and do not penetrate deep enough into the instability strip, or not at all. The inference of masses directly from the observational database yields a novel and strong constraint on evolutionary calculations.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: Cepheids - stars: evolution, Magellanic Clouds, distance moduli

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9558 1
2 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 369 0
3 NGC 416 Cl* 01 07 59.0 -72 21 20 12.73 12.55 11.76   10.71 ~ 129 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5761 1
5 SV* HV 2274 EB* 05 02 40.7806907576 -68 24 21.497024742 13.298 13.984 14.127 14.192 14.390 ~ 75 0
6 NGC 1835 Cl* 05 05 09.210 -69 24 20.96   11.314 10.596     ~ 155 0
7 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 234 1
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14990 1

    Equat.    Gal    SGal    Ecl

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2020.10.23-03:02:07

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