Kavli Affiliate: Huawei Zhang
| First 5 Authors: Shunxuan He, Yang Huang, XinYi Li, Huawei Zhang, Gaochao Liu
| Summary:
Utilizing Zwicky Transient Facility (ZTF) data and existing RR Lyrae stars
(RRLs) catalogs, this study achieves the first calibration of the $P –
phi_{31} – R_{21} – text{[Fe/H]}$ and $P-phi_{31}-A_{2}-A_{1}-text{[Fe/H]}$
relations in the ZTF photometric system for RRab and RRc stars. We also
re-calibrate the period-absolute magnitude-metallicity (PMZ) and
period-Wesenheit-metallicity (PWZ) relations in the ZTF $gri$-bands for RRab
and RRc stars. Based on nearly 4100 stars with precise measurements of $P$,
$phi_{31}$, $A_{2}$, and $A_{1}$, and available spectroscopic-metallicity
estimates, the photometric-metallicity relations exhibit strong internal
consistency across different bands, supporting the use of a weighted averaging
method for the final estimates. The photometric-metallicity estimates of
globular clusters based on RR Lyrae members also show excellent agreement with
high-resolution spectroscopic measurements, with typical scatter of 0.15 dex
for RRab stars and 0.14 dex for RRc stars, respectively. Using hundreds of
local RRLs with newly derived photometric metallicities and precise Gaia Data
Release 3 parallaxes, we establish the PMZ and PWZ relations in multiple bands.
Validation with globular cluster RR Lyrae members reveals typical distance
errors of 3.1% and 3.0% for the PMZ relations, and 3.1% and 2.6% for the PWZ
relations for RRab and RRc stars, respectively. Compared to PMZ relations, the
PWZ relations are tighter and almost unbiased, making them the recommended
choice for distance calculations. We present a catalog of 73,795 RRLs with
precise photometric metallicities; over 95% of them have accurate distance
measurements. Compared to Gaia DR3, approximately 25,000 RRLs have precise
photometric metallicities and distances derived for the first time.
| Search Query: ArXiv Query: search_query=au:”Huawei Zhang”&id_list=&start=0&max_results=3