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The Carnegie RR Lyrae Program: Mid-infrared Period-Luminosity relations of RR Lyrae stars in Reticulum

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Title: The Carnegie RR Lyrae Program: Mid-infrared Period-Luminosity relations of RR Lyrae stars in Reticulum
Authors: Muraveva, Tatiana, Garofalo, Alessia, Scowcroft, Victoria, Clementini, Gisella, Freedman, Wendy L., Madore, Barry F., Monson, Andrew J.
Publication Year: 2018
Collection: Astrophysics
Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies
More Details: We analysed 30 RR Lyrae stars (RRLs) 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 of 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 (MW) 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 Gaia 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 are 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 ~3 kpc closer to us than the barycentre of the LMC.
Comment: 17 pages, 10 figures. Accepted for publication in MNRAS
Document Type: Working Paper
DOI: 10.1093/mnras/sty1959
Access URL: http://arxiv.org/abs/1807.07493
Accession Number: edsarx.1807.07493
Database: arXiv
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  Data: The Carnegie RR Lyrae Program: Mid-infrared Period-Luminosity relations of RR Lyrae stars in Reticulum
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  Data: <searchLink fieldCode="AR" term="%22Muraveva%2C+Tatiana%22">Muraveva, Tatiana</searchLink><br /><searchLink fieldCode="AR" term="%22Garofalo%2C+Alessia%22">Garofalo, Alessia</searchLink><br /><searchLink fieldCode="AR" term="%22Scowcroft%2C+Victoria%22">Scowcroft, Victoria</searchLink><br /><searchLink fieldCode="AR" term="%22Clementini%2C+Gisella%22">Clementini, Gisella</searchLink><br /><searchLink fieldCode="AR" term="%22Freedman%2C+Wendy+L%2E%22">Freedman, Wendy L.</searchLink><br /><searchLink fieldCode="AR" term="%22Madore%2C+Barry+F%2E%22">Madore, Barry F.</searchLink><br /><searchLink fieldCode="AR" term="%22Monson%2C+Andrew+J%2E%22">Monson, Andrew J.</searchLink>
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  Data: 2018
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  Data: We analysed 30 RR Lyrae stars (RRLs) 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 of 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 (MW) 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 Gaia 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 are 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 ~3 kpc closer to us than the barycentre of the LMC.<br />Comment: 17 pages, 10 figures. Accepted for publication in MNRAS
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