摘要
We present time-series observations of Population II Cepheids in the Large Magellanic Cloud at near-infrared (JHK s) 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 K s-band data in the Galactic bulge from VISTA Variables in Via Láctea 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 K s-band P-L relation, resulting in a distance modulus to the LMC of 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 ) with estimates based on the relation for horizontal branch stars.
原文 | ???core.languages.en_GB??? |
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文章編號 | 154 |
期刊 | Astronomical Journal |
卷 | 153 |
發行號 | 4 |
DOIs | |
出版狀態 | 已出版 - 4月 2017 |
指紋
深入研究「Large Magellanic Cloud Near-infrared Synoptic Survey. IV. Leavitt Laws for Type II Cepheid Variables」主題。共同形成了獨特的指紋。資料集
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LMC NIR survey. IV. Type II Cepheid variables
Bhardwaj, A. (???dataset.roles.dataset.creator???), Macri, L. M. (???dataset.roles.dataset.creator???), Rejkuba, M. (???dataset.roles.dataset.creator???), Kanbur, S. M. (???dataset.roles.dataset.creator???), Ngeow, C.-C. (???dataset.roles.dataset.creator???) & Singh, H. P. (???dataset.roles.dataset.creator???), Strasbourg Astronomical Data Center, 2018
DOI: 10.26093/cds/vizier.51530154, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/154
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