RR Lyrae stars in globular clusters: better distances from infrared measurements?

Longmore, A. J.; Fernley, J.; Jameson, R. F.

doi:10.1093/mnras/220.2.279

Cited by 115 publications

(106 citation statements)

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“…Longmore et al (1986) and Longmore et al (1990) found that RR Lyrae stars in Galactic globular clusters follow a well-defined near-infrared period-luminosity (PL K ) relation, whose slope appears almost independent of the cluster metallicity. Bono et al (2001Bono et al ( , 2003 have shown that such an occurrence is actually in agreement with the predictions of current pulsational theory: making use of suitable analytical approximations of evolutionary and pulsational results, these authors presented theoretical predictions on the PL K in good agreement with observational constraints.…”

Section: The Pl K Relationsmentioning

confidence: 99%

RR Lyrae variables in Galactic globular clusters

Cassisi¹,

Castellani²,

Caputo³

et al. 2004

A&A

135

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Abstract. We present theoretical predictions concerning horizontal branch stars in globular clusters, including RR Lyrae variables, as derived from synthetic procedures collating evolutionary and pulsational constraints. On this basis, we explore the predicted behavior of the pulsators as a function of the horizontal branch morphology and over the metallicity range Z = 0.0001 to 0.006, revealing an encouraging concordance with the observed distribution of fundamentalised periods with metallicity. Theoretical relations connecting periods to K magnitudes and BV or VI Wesenheit functions are presented, both appearing quite independent of the horizontal branch morphology only with Z ≥ 0.001. Predictions concerning the parameter R are also discussed and compared under various assumptions about the horizontal branch reference luminosity level.

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Section: The Pl K Relationsmentioning

confidence: 99%

RR Lyrae variables in Galactic globular clusters

Cassisi¹,

Castellani²,

Caputo³

et al. 2004

A&A

135

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“…RR Lyrae stars in particular, obey a period-luminosity-metallicity (PLZ) relation in the K band which is weakly affected by evolutionary effects, spread in stellar mass within the instability strip, and uncertainties in reddening corrections (see Longmore et al 1986, andSollima et al 2006 for updates). Similarly, the Cepheid PL relation in the K band is much narrower than the corresponding optical relations, and less affected by systematic uncertainties in reddening and metal content (Caputo et al 2000).…”

Section: Rr Lyrae Stars and Cepheidsmentioning

confidence: 99%

The VMC survey

Cioni

Clementini

Girardi

et al. 2011

A&A

311

304

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Context. The new VISual and Infrared Telescope for Astronomy (VISTA) has started operations. Over its first five years it will be collecting data for six public surveys, one of which is the near-infrared Y JK s VISTA survey of the Magellanic Clouds system (VMC). This survey comprises the Large Magellanic Cloud (LMC), the Small Magellanic Cloud, the Magellanic Bridge connecting the two galaxies and two fields in the Magellanic Stream. Aims. This paper provides an overview of the VMC survey strategy and presents first science results. The main goals of the VMC survey are the determination of the spatially-resolved star-formation history and the three-dimensional structure of the Magellanic system. The VMC survey is therefore designed to reach stars as faint as the oldest main sequence turn-off point and to constrain the mean magnitude of pulsating variables such as RR Lyrae stars and Cepheids. This paper focuses on observations of VMC fields in the LMC obtained between November 2009 and March 2010. These observations correspond to a completeness of 7% of the planned LMC fields. Methods. The VMC data are comprised of multi-epoch observations which are executed following specific time constraints. The data were reduced using the VISTA Data Flow System pipeline with source catalogues, including astrometric and photometric corrections, produced and made available via the VISTA Science Archive. The VMC data will be released to the astronomical community following the European Southern Observatory's Public Survey policy. The analysis of the data shows that the sensitivity in each wave band agrees with expectations. Uncertainties and completeness of the data are also derived. Results. The first science results, aimed at assessing the scientific quality of the VMC data, include an overview of the distribution of stars in colour-magnitude and colour-colour diagrams, the detection of planetary nebulae and stellar clusters, and the K s band light-curves of variable stars. Conclusions. The VMC survey represents a tremendous improvement, in spatial resolution and sensitivity, on previous panoramic observations of the Magellanic system in the near-infrared, providing a powerful complement to deep observations at other wavelengths.

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“…RR Lyrae stars make useful distance indicators because of the existence of an absolute magnitude-metallicity relation in the V band: (Sandage 1981a,b) and of a period-luminosity-metallicity relation in the K band: P L K Z (Longmore et al 1986, Bono et al 2003, Catelan et al 2004, Sollima et al 2008, and references therein).…”

Section: V − [Fe/h] and P L K Z Relations Of Rr Lyrae Starsmentioning

confidence: 99%

“…Longmore et al (1986) pioneering work was followed by Liu & Janes (1990), Skillen et al (1993) and Jones et al (1996). A comprehensive analysis of the IR properties of RR Lyrae stars was performed by Nemec et al (1994).…”

Section: V − [Fe/h] and P L K Z Relations Of Rr Lyrae Starsmentioning

confidence: 99%