Cepheid Metallicity in the Leavitt Law (C-MetaLL) Survey. V. New multiband (grizJHKs) Cepheid light curves and period-luminosity relations
arxiv(2024)
摘要
We present homogeneous multiband (grizJHKs) time-series observations of 78
Cepheids including 49 fundamental mode variables and 29 first-overtone mode
variables. These observations were collected simultaneously using the ROS2 and
REMIR instruments at the Rapid Eye Mount telescope. The Cepheid sample covers a
large range of distances (0.5 - 19.7 kpc) with varying precision of parallaxes,
and thus astrometry-based luminosity fits were used to derive PL and PW
relations in optical Sloan (griz) and near-infrared (JHKs) filters. These
empirically calibrated relations exhibit large scatter primarily due to larger
uncertainties in parallaxes of distant Cepheids, but their slopes agree well
with those previously determined in the literature. Using homogeneous
high-resolution spectroscopic metallicities of 61 Cepheids covering -1.1 <
[Fe/H] < 0.6 dex, we quantified the metallicity dependence of PL and PW
relations which varies between -0.30±0.11 (in Ks) and -0.55±0.12 (in z)
mag/dex in grizJHKs bands. However, the metallicity dependence in the residuals
of the PL and PW relations is predominantly seen for metal-poor stars ([Fe/H] <
-0.3 dex), which also have larger parallax uncertainties. The modest sample
size precludes us from separating the contribution to the residuals due to
parallax uncertainties, metallicity effects, and reddening errors. While this
Cepheid sample is not optimal for calibrating the Leavitt law, upcoming
photometric and spectroscopic datasets of the C-MetaLL survey will allow the
accurate derivation of PL and PW relations in the Sloan and near-infrared
bandpasses, which will be useful for the distance measurements in the era of
the Vera C. Rubin Observatory's Legacy Survey of Space and Time and upcoming
extremely large telescopes.
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