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

^*Corresponding author for this work

Kapteyn Astronomical Institute

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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
Pages (from-to)	L21-L24
Number of pages	4
Journal	Astrophysical Journal Letters
Volume	678
Issue number	1
DOIs	https://doi.org/10.1086/588285
Publication status	Published - 1-May-2008

Keywords

galaxies : dwarf
galaxies : individual (Tucana)
Local Group
stars : horizontal-branch
stars : variables : other
GALACTIC GLOBULAR-CLUSTERS
PERIOD-AMPLITUDE RELATION
COLOR-MAGNITUDE DIAGRAM
2ND-PARAMETER PROBLEM
METALLICITY RELATION
VARIABLE-STARS
PHOTOMETRY
COMPONENTS
IV

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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 Letters, 678(1), L21-L24. https://doi.org/10.1086/588285

@article{7958b50ab36a4a748c7e10c50b00cd0a,

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.",

keywords = "galaxies : dwarf, galaxies : individual (Tucana), Local Group, stars : horizontal-branch, stars : variables : other, GALACTIC GLOBULAR-CLUSTERS, PERIOD-AMPLITUDE RELATION, COLOR-MAGNITUDE DIAGRAM, 2ND-PARAMETER PROBLEM, METALLICITY RELATION, VARIABLE-STARS, PHOTOMETRY, COMPONENTS, IV",

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",

month = may,

day = "1",

doi = "10.1086/588285",

language = "English",

volume = "678",

pages = "L21--L24",

journal = "Astrophysical Journal Letters",

issn = "2041-8213",

publisher = "IOP PUBLISHING LTD",

number = "1",

}

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 Letters, vol. 678, no. 1, pp. L21-L24. https://doi.org/10.1086/588285

TY - JOUR

T1 - The ACS LCID project

T2 - RR Lyrae stars as tracers of old population gradients in the isolated dwarf spheroidal galaxy tucana

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

PY - 2008/5/1

Y1 - 2008/5/1

N2 - 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.

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.

KW - galaxies : dwarf

KW - galaxies : individual (Tucana)

KW - Local Group

KW - stars : horizontal-branch

KW - stars : variables : other

KW - GALACTIC GLOBULAR-CLUSTERS

KW - PERIOD-AMPLITUDE RELATION

KW - COLOR-MAGNITUDE DIAGRAM

KW - 2ND-PARAMETER PROBLEM

KW - METALLICITY RELATION

KW - VARIABLE-STARS

KW - PHOTOMETRY

KW - COMPONENTS

KW - IV

U2 - 10.1086/588285

DO - 10.1086/588285

M3 - Article

SN - 2041-8213

VL - 678

SP - L21-L24

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

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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Keywords

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