The Araucaria Project: The Distance to the Carina Dwarf Galaxy From Infrared Photometry of Rr Lyrae Stars

Karczmarek, P.; Pietrzyński, G.; Gieren, W.; Suchomska, K.; Konorski, P.; Górski, Marek; Pilecki, B.; Graczyk, D.; Wielgórski, Piotr

doi:10.1088/0004-6256/150/3/90

Cited by 23 publications

(13 citation statements)

References 43 publications

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“…We assumed a distance modulus for Carina of m − M = 20.1 and a line-of-sight E(B − V ) = 0.03 mag, as estimated by, e.g. Dall'Ora et al (2003) and Karczmarek et al (2015) 2 . The considered age-range of the isochrones has been set to be between 1 Gyr and 13.7 Gyr.…”

Section: Age Determination Of the Red Giant Branch Starsmentioning

confidence: 99%

Chemodynamic subpopulations of the Carina dwarf galaxy

Kordopatis

Amorisco

Evans

et al. 2016

Mon. Not. R. Astron. Soc.

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We study the chemodynamical properties of the Carina dwarf spheroidal by combining an intermediate spectroscopic resolution dataset of more than 900 red giant and red clump stars, with high-precision photometry to derive the atmospheric parameters, metallicities and age estimates for our targets. Within the red giant branch population, we find evidence for the presence of three distinct stellar sub-populations with different metallicities, spatial distributions, kinematics and ages. As in the Fornax and Sculptor dwarf spheroidals, the subpopulation with the lowest average metallicity is more extended and kinematically hotter than all other populations. However, we identify an inversion in the parallel ordering of metallicity, kinematics and characteristic length scale in the two most metal rich subpopulations, which therefore do not contribute to a global negative chemical gradient. Contrary to common trends in the chemical properties with radius, the metal richest population is more extended and mildly kinematically hotter than the main component of intermediate metallicity. More investigations are required to ascertain the nature of this inversion, but we comment on the mechanisms that might have caused it.

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Section: Age Determination Of the Red Giant Branch Starsmentioning

confidence: 99%

Chemodynamic subpopulations of the Carina dwarf galaxy

Kordopatis

Amorisco

Evans

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Coppola et al 2011;Sollima et al 2006;Braga et al 2015), and in nearby galaxies (e.g. Moretti et al 2014;Karczmarek et al 2015;Muraveva et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period–Wesenheit–metallicity relation

Neeley

Marengo

Freedman

et al. 2019

Monthly Notices of the Royal Astronomical Society

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RR Lyrae stars have long been popular standard candles, but significant advances in methodology and technology have been made in recent years to increase their precision as distance indicators. We present multi-wavelength (optical UBV R c I c and Gaia G, BP, RP; near-infrared JHK s ; mid-infrared [3.6], [4.5]) period-luminosity-metallicity (PLZ), period-Wesenheit-metallicity (PWZ) relations, calibrated using photometry obtained from The Carnegie RR Lyrae Program and parallaxes from the Gaia second data release for 55 Galactic field RR Lyrae stars. The metallicity slope, which has long been predicted by theoretical relations, can now be measured in all passbands. The scatter in the PLZ relations is on the order of 0.2 mag, and is still dominated by uncertainties in the parallaxes. As a consistency check of our PLZ relations, we also measure the distance modulus to the globular cluster M4, the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC), and our results are in excellent agreement with estimates from previous studies. † Hubble Fellow distances cannot be measured with the traditional distance scale.

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“…Carina is a Local Group dwarf spheroidal (dSph) galaxy located at about 104 kpc from the Sun (Karczmarek et al 2015), with a half-light radius of  250 39 pc (Irwin & Hatzidimitriou 1995), a dynamical mass within the halflight radius of < = Ḿ r 3.4 1.4 10 dyn half 6 ( ) M  (Walker et al 2009), and an absolute magnitude of = -M 9.3 V (Mateo 1998). This galaxy is especially important as a constraint on Galactic evolution since it is one of the few Local Group galaxies showing an episodic star-formation history (SFH) (e.g., Weisz et al 2014b).…”

Section: Introductionmentioning

confidence: 99%

A Megacam Survey of Outer Halo Satellites. Vi. The Spatially Resolved Star-Formation History of the Carina Dwarf Spheroidal Galaxy*

Santana¹,

Muñoz²,

Boer³

et al. 2016

ApJ

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We present the spatially resolved star-formation history (SFH) of the Carina dwarf spheroidal galaxy, obtained from deep, wide-field g andr imaging and a metallicity distribution from the literature. Our photometry covers ∼2 deg 2 , reaching up to ∼10 times the half-light radius of Carina with a completeness higher than 50% at g∼24.5, more than one magnitude fainter than the oldest turnoff. This is the first time a combination of depth and coverage of this quality has been used to derive the SFH of Carina, enabling us to trace its different populations with unprecedented accuracy. We find that Carina's SFH consists of two episodes well separated by a star-formation temporal gap. These episodes occurred at old (>10 Gyr) and intermediate (2-8 Gyr) ages. Our measurements show that the old episode comprises the majority of the population, accounting for 54±5% of the stellar mass within 1.3 times the King tidal radius, while the total stellar mass derived for Carina is ´ M 1.60 0.09 10 6, and the stellar mass-to-light ratio is 1.8±0.2. The SFH derived is consistent with no recent star formation, which hints that the observed blue plume is due to blue stragglers. We conclude that the SFH of Carina evolved independently of the tidal field of the Milky Way, since the frequency and duration of its star-formation events do not correlate with its orbital parameters. This result is supported by the age-metallicity relation observed in Carinaand the gradients calculated indicating that outer regions are older and more metal-poor.

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The Araucaria Project: The Distance to the Carina Dwarf Galaxy From Infrared Photometry of Rr Lyrae Stars

Cited by 23 publications

References 43 publications

Chemodynamic subpopulations of the Carina dwarf galaxy

Chemodynamic subpopulations of the Carina dwarf galaxy

Standard Galactic field RR Lyrae II: a Gaia DR2 calibration of the period–Wesenheit–metallicity relation

A Megacam Survey of Outer Halo Satellites. Vi. The Spatially Resolved Star-Formation History of the Carina Dwarf Spheroidal Galaxy*

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