2006ApJ...653L.101B

Query : 2006ApJ...653L.101B

2006ApJ...653L.101B - Astrophys. J., 653, L101-L104 (2006/December-3)

Detection of beat cepheids in M 33 and their use as a probe of the M 33 metallicity distribution.

BEAULIEU J.-P., BUCHLER J.R., MARQUETTE J.-B., HARTMAN J.D. and SCHWARZENBERG-CZERNY A.

Abstract (from CDS):

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 mass-luminosity 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 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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Journal keyword(s): Stars: Variables: Cepheids - Galaxies: Abundances - Galaxies: Evolution - Galaxies: Individual: Messier Number: M33 - stars: oscillations (including pulsations)

Nomenclature: Table 1: [BBM2006b] A (Nos A-E).

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 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 [BBM2006b] B Ce* 01 32 56.82 +30 41 33.8           ~ 2 0
3 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
4 [BBM2006b] D Ce* 01 33 54.63 +30 35 19.8           ~ 2 0
5 D33 J013403.9+303808.4 Ce* 01 34 03.97 +30 38 08.4   21.16 20.67     ~ 3 0
6 [BBM2006b] C Ce* 01 34 33.43 +30 51 15.6           ~ 2 0
7 [BBM2006b] A Ce* 01 34 59.72 +30 52 25.2           ~ 2 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0

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