000007667 001__ 7667
000007667 005__ 20251227093156.0
000007667 037__ $$aSCART-2025-0158
000007667 100__ $$aSicignano, T. 
000007667 245__ $$aThe VMC Survey -- LII. Anomalous Cepheids in the Magellanic Clouds Period-Luminosity relations in the near-infrared bands 
000007667 260__ $$c2025
000007667 520__ $$aContext. Anomalous Cepheids (ACs) are pulsating variable stars, and are less studied compared to the well-known Classical Cepheids (CCs) and RR Lyrae stars. The ACs are metal poor ([Fe/H] < 1.5) and follow distinct period-luminosity (PL) and period-Wesenheit (PW) relations that can be used for distance measurements, and they can pulsate in the fundamental (F) and first overtone (1O) modes. Aims. Our goal is to evaluate the precision and accuracy of distances obtained via PL and PW relations of ACs and thus to assess if they could be used to establish a cosmic distance scale independent from CCs. To this aim, we derived new, precise PL and PW relations for the F mode, the 1O mode, and, for the first time, the combined F+1O mode ACs in the Magellanic Clouds. We investigated the wavelength dependence of these relations and applied them to calculate the distances of various stellar systems in the Local Group hosting ACs, as well as to confirm the classification of these variable stars. Methods. We analyzed near-infrared (NIR) time series photometry in the Y, J, and Ks bands for about 200 ACs in the Magellanic Clouds acquired during 2009–2018 in the context of the VISTA survey of the Magellanic Clouds system (VMC), a European Southern Observatory public survey. The VMC NIR photometry was complemented with optical data from Gaia DR3 and the Optical Gravitational Lensing Experiment IV survey, which also provided the identification, periods, and pulsation mode for the investigated ACs. Custom templates generated from our best light curves were used to derive precise intensity-averaged mean magnitudes for 118 and 75 ACs in the Large (LMC) and Small Magellanic Clouds (SMC), respectively. Results. Optical and NIR mean magnitudes were used to derive multiband PL and PW relations, which were calibrated with the geometric distance modulus to the LMC based on eclipsing binaries. We investigated the dependence of PL relations on wavelength, finding that slopes increase and dispersion decreases when going from optical to NIR bands. We calculated the LMC distance modulus through calibrated AC PW relations in the Milky Way using Gaia parallaxes, the LMC-SMC relative distance modulus, and we confirmed the AC nature of a few new pulsators in Galactic globular clusters. We derived a distance modulus for the Draco dwarf spheroidal galaxy of 19.425 ± 0.048 mag, which is in agreement with recent literature determinations, but a discrepancy of 0.1 mag with RR Lyrae-based distance hints at possible metallicity effects on the AC PL and PW relations. Future spectroscopic surveys and Gaia DR4 will refine the AC distance scale and assess metallicity effects on PLRs and PWRs.
000007667 594__ $$aNO
000007667 6531_ $$astars: variables
000007667 6531_ $$aCepheids
000007667 6531_ $$adistance scale
000007667 700__ $$aRipepi, V. 
000007667 700__ $$aRejkuba, M. 
000007667 700__ $$aRomaniello, M. 
000007667 700__ $$aMarconi, M.
000007667 700__ $$aMolinaro, R. 
000007667 700__ $$aBhardwaj, A. 
000007667 700__ $$aDe Somma, G. 
000007667 700__ $$aCioni, M.-R.L.
000007667 700__ $$aCusano, F.   
000007667 700__ $$aClementini, G. 
000007667 700__ $$ade Grijs, R. 
000007667 700__ $$aIvanov, V.D. 
000007667 700__ $$aStorm, J.
000007667 700__ $$aGroenewegen, M.A.T.
000007667 773__ $$cA370$$pA&A$$v699$$y2025
000007667 8560_ $$fmartin.groenewegen@ksb-orb.be
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000007667 905__ $$apublished in
000007667 980__ $$aREFERD