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2017AJ....153..154B - Astron. J., 153, 154-154 (2017/April-0)

Large Magellanic Cloud near-infrared synoptic survey. IV. Leavitt laws for Type II Cepheid variables.


Abstract (from CDS):

We present time-series observations of Population II Cepheids in the Large Magellanic Cloud at near-infrared (JHKs) wavelengths. Our sample consists of 81 variables with accurate periods and optical (VI) magnitudes from the OGLE survey, covering various subtypes of pulsators (BL Herculis, W Virginis, and RV Tauri). We generate light-curve templates using high-quality I-band data in the LMC from OGLE and Ks-band data in the Galactic bulge from VISTA Variables in Via Lactea survey and use them to obtain robust mean magnitudes. We derive period-luminosity (P-L) relations in the near-infrared and Period-Wesenheit (P-W) relations by combining optical and near-infrared data. Our P-L and P-W relations are consistent with published work when excluding long-period RV Tauris. We find that Pop II Cepheids and RR Lyraes follow the same P-L relations in the LMC. Therefore, we use trigonometric parallax from the Gaia DR1 for VY Pyx and the Hubble Space Telescope parallaxes for k Pav and 5 RR Lyrae variables to obtain an absolute calibration of the Galactic Ks-band P-L relation, resulting in a distance modulus to the LMC of µLMC=18.54±0.08 mag. We update the mean magnitudes of Pop II Cepheids in Galactic globular clusters using our light-curve templates and obtain distance estimates to those systems, anchored to a precise late-type eclipsing binary distance to the LMC. We find that the distances to these globular clusters based on Pop II Cepheids are consistent (within 2σ) with estimates based on the MV-[Fe/H] relation for horizontal branch stars.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): distance scale - Magellanic Clouds - stars: variables: Cepheids - stars: variables: Cepheids

VizieR on-line data: <Available at CDS (J/AJ/153/154): table4.dat table1.dat table11.dat table10.dat>

Simbad objects: 121

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