Detection of beat cepheids in M33 and their use as a probe of the M33 metallicity distribution

J. P. Beaulieu; J. Robert Buchler; J. B. Marquette; J. D. Hartman; A. Schwarzenberg-Czerny

doi:10.1086/510453

Detection of beat cepheids in M33 and their use as a probe of the M33 metallicity distribution

J. P. Beaulieu, J. Robert Buchler, J. B. Marquette, J. D. Hartman, A. Schwarzenberg-Czerny

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

Abstract

Our analysis of the deep CFHT M33 variability survey database has uncovered five beat Cepheids that are pulsating in the fundamental and first-overtone modes. With only the help of stellar pulsation theory and of massluminosity relations, derived from evolutionary tracks, we can accurately determine the metallicities Z of these stars. The [O/H] metallicity gradient of -0.16 dex kpc^-1 that is inferred from the M33 galactocentric distances of these Cepheids and from their "pulsation" metallicities is in excellent agreement with the standard spectroscopic metallicity gradients that are determined from H II regions, early-B supergiant stars, and planetary nebulae. Beat Cepheids can thus provide an additional, independent probe of galactic metallicity distributions.

Original language	American English
Pages (from-to)	L101-L104
Journal	Astrophysical Journal
Volume	653
Issue number	2 II
DOIs	https://doi.org/10.1086/510453
State	Published - Dec 20 2006
Externally published	Yes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Cepheids
Galaxies: Abundances
Galaxies: Evolution
Galaxies: Individual (M33)
Stars: Oscillations (including pulsations)

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10.1086/510453

Cite this

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title = "Detection of beat cepheids in M33 and their use as a probe of the M33 metallicity distribution",

abstract = "Our analysis of the deep CFHT M33 variability survey database has uncovered five beat Cepheids that are pulsating in the fundamental and first-overtone modes. With only the help of stellar pulsation theory and of massluminosity relations, derived from evolutionary tracks, we can accurately determine the metallicities Z of these stars. The [O/H] metallicity gradient of -0.16 dex kpc-1 that is inferred from the M33 galactocentric distances of these Cepheids and from their {"}pulsation{"} metallicities is in excellent agreement with the standard spectroscopic metallicity gradients that are determined from H II regions, early-B supergiant stars, and planetary nebulae. Beat Cepheids can thus provide an additional, independent probe of galactic metallicity distributions.",

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author = "Beaulieu, {J. P.} and Buchler, {J. Robert} and Marquette, {J. B.} and Hartman, {J. D.} and A. Schwarzenberg-Czerny",

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TY - JOUR

T1 - Detection of beat cepheids in M33 and their use as a probe of the M33 metallicity distribution

AU - Beaulieu, J. P.

AU - Buchler, J. Robert

AU - Marquette, J. B.

AU - Hartman, J. D.

AU - Schwarzenberg-Czerny, A.

PY - 2006/12/20

Y1 - 2006/12/20

N2 - Our analysis of the deep CFHT M33 variability survey database has uncovered five beat Cepheids that are pulsating in the fundamental and first-overtone modes. With only the help of stellar pulsation theory and of massluminosity relations, derived from evolutionary tracks, we can accurately determine the metallicities Z of these stars. The [O/H] metallicity gradient of -0.16 dex kpc-1 that is inferred from the M33 galactocentric distances of these Cepheids and from their "pulsation" metallicities is in excellent agreement with the standard spectroscopic metallicity gradients that are determined from H II regions, early-B supergiant stars, and planetary nebulae. Beat Cepheids can thus provide an additional, independent probe of galactic metallicity distributions.

AB - Our analysis of the deep CFHT M33 variability survey database has uncovered five beat Cepheids that are pulsating in the fundamental and first-overtone modes. With only the help of stellar pulsation theory and of massluminosity relations, derived from evolutionary tracks, we can accurately determine the metallicities Z of these stars. The [O/H] metallicity gradient of -0.16 dex kpc-1 that is inferred from the M33 galactocentric distances of these Cepheids and from their "pulsation" metallicities is in excellent agreement with the standard spectroscopic metallicity gradients that are determined from H II regions, early-B supergiant stars, and planetary nebulae. Beat Cepheids can thus provide an additional, independent probe of galactic metallicity distributions.

KW - Cepheids

KW - Galaxies: Abundances

KW - Galaxies: Evolution

KW - Galaxies: Individual (M33)

KW - Stars: Oscillations (including pulsations)

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U2 - 10.1086/510453

DO - 10.1086/510453

M3 - Article

SN - 0004-637X

VL - 653

SP - L101-L104

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

Detection of beat cepheids in M33 and their use as a probe of the M33 metallicity distribution

Abstract

ASJC Scopus subject areas

Keywords

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