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The distance scale of Type II Cepheids from near-infrared observations in the Magellanic Clouds

Published online by Cambridge University Press:  06 February 2024

T. Sicignano Open the ORCID record for T. Sicignano [Opens in a new window] ,
V. Ripepi ,
R. Molinaro ,
A. Bhardwaj Open the ORCID record for A. Bhardwaj [Opens in a new window] ,
M. Marconi Open the ORCID record for M. Marconi [Opens in a new window]  and
M.-R. L. Cioni Open the ORCID record for M.-R. L. Cioni [Opens in a new window]
T. Sicignano*
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
V. Ripepi
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
R. Molinaro
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
A. Bhardwaj
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
M. Marconi
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
M.-R. L. Cioni
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
*
email: teresa.sicignano@inaf.it
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Abstract

We employed data from the VISTA near-infrared YJKS survey of the Magellanic System to analyse the light curves of Type II Cepheids (T2Cs) in the Large and Small Magellanic Clouds (LMC and SMC, respectively). Using the T2Cs identified by the OGLE IV survey and Gaia mission, we built up a sample of about 330 pulsators belonging to both galaxies. For all these objects we obtained accurate intensity-averaged magnitudes in the YJKS bands by means of a template-fitting technique. We complemented our near-infrared data with optical photometry from the literature to calculate period-luminosity and period-Wesenheit relations for a variety of different bands and colour combinations and separately for the different T2C subclasses (BL Herculis, W Virginis, peculiar W Virginis, RV Tauri). These relations, calibrated with the LMC distance modulus, were tested using T2Cs belonging to Galactic globular clusters. We thus calculated the distances of 22 clusters and compared them with the literature values, mainly based on RR Lyrae stars, finding good agreement within 1 σ and dispersion of the order of 0.3 – 0.5 kpc, depending on the adopted period-luminosity/period-Wesenheit relation.

Keywords

Variable starsType II CepheidsPulsationsMagellanic CloudsDistance Scale
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 205 - 213
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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