The acs lcid project: Rr lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana

Edouard J. Bernard; Carme Gallart; Matteo Monelli; Antonio Aparicio; Santi Cassisi; Evan D. Skillman; Peter B. Stetson; Andrew A. Cole; Igor Drozdovsky; Sebastian L. Hidalgo; Mario Mateo; Eline Tolstoy

doi:10.1086/588285

The acs lcid project: Rr lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana

Edouard J. Bernard, Carme Gallart, Matteo Monelli, Antonio Aparicio, Santi Cassisi, Evan D. Skillman, Peter B. Stetson, Andrew A. Cole, Igor Drozdovsky, Sebastian L. Hidalgo, Mario Mateo, Eline Tolstoy

Physics and Astronomy (Twin Cities)

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Abstract

We present a study of the radial distribution of RR Lyrae variables, which present a range of photometric and pulsational properties, in the dwarf spheroidal galaxy Tucana. We find that the fainter RR Lyrae stars, having a shorter period, are more centrally concentrated than the more luminous, longer period RR Lyrae variables. Through comparison with the predictions of theoretical models of stellar evolution and stellar pulsation, we interpret the fainter RR Lyrae stars as a more metal-rich subsample. In addition, we show that they must be older than about 10 Gyr. Therefore, the metallicity gradient must have appeared very early on in the history of this galaxy.

Original language	English (US)
Pages (from-to)	L21-L24
Journal	Astrophysical Journal
Volume	678
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/588285
State	Published - 2008

Keywords

Dwarf
Galaxies
Horizontal-branch
Individual (Tucana)
Local Group
Other
Stars
Variables

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Bernard, E. J., Gallart, C., Monelli, M., Aparicio, A., Cassisi, S., Skillman, E. D., Stetson, P. B., Cole, A. A., Drozdovsky, I., Hidalgo, S. L., Mateo, M., & Tolstoy, E. (2008). The acs lcid project: Rr lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana. Astrophysical Journal, 678(1 PART 2), L21-L24. https://doi.org/10.1086/588285

Bernard, EJ, Gallart, C, Monelli, M, Aparicio, A, Cassisi, S, Skillman, ED, Stetson, PB, Cole, AA, Drozdovsky, I, Hidalgo, SL, Mateo, M & Tolstoy, E 2008, 'The acs lcid project: Rr lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana', Astrophysical Journal, vol. 678, no. 1 PART 2, pp. L21-L24. https://doi.org/10.1086/588285

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title = "The acs lcid project: Rr lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana",

abstract = "We present a study of the radial distribution of RR Lyrae variables, which present a range of photometric and pulsational properties, in the dwarf spheroidal galaxy Tucana. We find that the fainter RR Lyrae stars, having a shorter period, are more centrally concentrated than the more luminous, longer period RR Lyrae variables. Through comparison with the predictions of theoretical models of stellar evolution and stellar pulsation, we interpret the fainter RR Lyrae stars as a more metal-rich subsample. In addition, we show that they must be older than about 10 Gyr. Therefore, the metallicity gradient must have appeared very early on in the history of this galaxy.",

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author = "Bernard, {Edouard J.} and Carme Gallart and Matteo Monelli and Antonio Aparicio and Santi Cassisi and Skillman, {Evan D.} and Stetson, {Peter B.} and Cole, {Andrew A.} and Igor Drozdovsky and Hidalgo, {Sebastian L.} and Mario Mateo and Eline Tolstoy",

year = "2008",

doi = "10.1086/588285",

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AU - Bernard, Edouard J.

AU - Gallart, Carme

AU - Monelli, Matteo

AU - Aparicio, Antonio

AU - Cassisi, Santi

AU - Skillman, Evan D.

AU - Stetson, Peter B.

AU - Cole, Andrew A.

AU - Drozdovsky, Igor

AU - Hidalgo, Sebastian L.

AU - Mateo, Mario

AU - Tolstoy, Eline

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AB - We present a study of the radial distribution of RR Lyrae variables, which present a range of photometric and pulsational properties, in the dwarf spheroidal galaxy Tucana. We find that the fainter RR Lyrae stars, having a shorter period, are more centrally concentrated than the more luminous, longer period RR Lyrae variables. Through comparison with the predictions of theoretical models of stellar evolution and stellar pulsation, we interpret the fainter RR Lyrae stars as a more metal-rich subsample. In addition, we show that they must be older than about 10 Gyr. Therefore, the metallicity gradient must have appeared very early on in the history of this galaxy.

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KW - Galaxies

KW - Horizontal-branch

KW - Individual (Tucana)

KW - Local Group

KW - Other

KW - Stars

KW - Variables

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ER -

The acs lcid project: Rr lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana

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