Large magellanic cloud bump cepheids: Probing the stellar mass-luminosity relation

S. C. Keller; P. R. Wood

doi:10.1086/342315

Large magellanic cloud bump cepheids: Probing the stellar mass-luminosity relation

S. C. Keller^*, P. R. Wood

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

We present the results of nonlinear pulsation modeling of 20 bump Cepheids in the LMC. By obtaining an optimal fit to the observed V, R MACHO light curves, we have placed tight constraints on stellar parameters of M, L, and T _eff as well as quantities of distance modulus and reddening. We describe the mass-luminosity relation for core He burning for intermediate-mass stars. The mass-luminosity relation depends critically on the level of mixing within the stellar interior over the course of the main-sequence lifetime. Our sample is significantly more luminous than predicted by classical stellar evolutionary models that do not incorporate extension to the convective core. Under the paradigm of convective core overshoot, our data imply A_c of 0.65 = 0.031/H_p. We derive a LMC distance modulus of 18.55 ± 0.02.

Original language	English
Pages (from-to)	144-150
Number of pages	7
Journal	Astrophysical Journal
Volume	578
Issue number	1 I
DOIs	https://doi.org/10.1086/342315
Publication status	Published - 10 Oct 2002

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title = "Large magellanic cloud bump cepheids: Probing the stellar mass-luminosity relation",

abstract = "We present the results of nonlinear pulsation modeling of 20 bump Cepheids in the LMC. By obtaining an optimal fit to the observed V, R MACHO light curves, we have placed tight constraints on stellar parameters of M, L, and T eff as well as quantities of distance modulus and reddening. We describe the mass-luminosity relation for core He burning for intermediate-mass stars. The mass-luminosity relation depends critically on the level of mixing within the stellar interior over the course of the main-sequence lifetime. Our sample is significantly more luminous than predicted by classical stellar evolutionary models that do not incorporate extension to the convective core. Under the paradigm of convective core overshoot, our data imply Ac of 0.65 = 0.031/Hp. We derive a LMC distance modulus of 18.55 ± 0.02.",

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T2 - Probing the stellar mass-luminosity relation

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AU - Wood, P. R.

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AB - We present the results of nonlinear pulsation modeling of 20 bump Cepheids in the LMC. By obtaining an optimal fit to the observed V, R MACHO light curves, we have placed tight constraints on stellar parameters of M, L, and T eff as well as quantities of distance modulus and reddening. We describe the mass-luminosity relation for core He burning for intermediate-mass stars. The mass-luminosity relation depends critically on the level of mixing within the stellar interior over the course of the main-sequence lifetime. Our sample is significantly more luminous than predicted by classical stellar evolutionary models that do not incorporate extension to the convective core. Under the paradigm of convective core overshoot, our data imply Ac of 0.65 = 0.031/Hp. We derive a LMC distance modulus of 18.55 ± 0.02.

KW - Cepheids

KW - Distance scale

KW - Magellanic Clouds

KW - Stars: evolution

KW - Stars: oscillations

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JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

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Large magellanic cloud bump cepheids: Probing the stellar mass-luminosity relation

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