The Carnegie RR Lyrae Program: mid-infrared period-luminosity relations of RR Lyrae stars in Reticulum

被引：19

作者：

Muraveva, Tatiana ^{[1
]}

Garofalo, Alessia ^{[1
,2
]}

Scowcroft, Victoria ^{[3
,4
]}

Clementini, Gisella ^{[1
]}

Freedman, Wendy L. ^{[5
]}

Madore, Barry F. ^{[4
,5
]}

Monson, Andrew J. ^{[6
]}

机构：

[1] Osservatorio Astrofis & Sci Spazio Bologna, INAF, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[2] Univ Bologna, Dipartimento Fis & Astron, Via Piero Gobetti 93-2, I-40129 Bologna, Italy

[3] Univ Bath, Dept Phys, Claverton Down, Bath BA2 7AY, Avon, England

[4] Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA

[5] Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA

[6] Penn State Univ, Dept Astron & Astrophys, Davey Lab 403, University Pk, PA 16802 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 480卷 / 03期

关键词：

stars: distances; stars: variables: RR Lyrae; globular clusters: individual: Reticulum; Magellanic Clouds; LARGE-MAGELLANIC-CLOUD; ABSOLUTE MAGNITUDES; OMEGA-CENTAURI; LIGHT CURVES; METALLICITY; PHOTOMETRY; CLUSTERS; DISTANCE; SYSTEM; EMISSION;

D O I：

10.1093/mnras/sty1959

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We analysed 30 RR Lyrae stars (RRL5) located in the Large Magellanic Cloud (LMC) globular cluster Reticulum that were observed in the 3.6 and 4.5 mu m passbands with the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope. We derived new mid-infrared (MIR) period-luminosity (PL) relations. The zero points of the PL relations were estimated using the trigonometric parallaxes of five bright Milky Way RRLs measured with the Hubble Space Telescope (HST) and, as an alternative, we used the trigonometric parallaxes published in the first Gaia data release (DR1), which were obtained as part of the Tycho-Gaia Astrometric Solution (TGAS) and the parallaxes of the same stars released with the second Gala data release (DR2). We determined the distance to Reticulum, using our new MIR PL relations, and found that distances calibrated on the TGAS and DR2 parallaxes arc in a good agreement and, generally, smaller than distances based on the HST parallaxes, although they are still consistent within the respective errors. We conclude that Reticulum is located similar to 3 kpc closer to us than the barycentre of the LMC.

引用

页码：4138 / 4153

页数：16

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