2022A&A...659A.167R


Query : 2022A&A...659A.167R

2022A&A...659A.167R - Astronomy and Astrophysics, volume 659A, 167-167 (2022/3-1)

Classical Cepheid period-Wesenheit-metallicity relation in the Gaia bands.

RIPEPI V., CATANZARO G., CLEMENTINI G., DE SOMMA G., DRIMMEL R., LECCIA S., MARCONI M., MOLINARO R., MUSELLA I. and POGGIO E.

Abstract (from CDS):

Context. Classical Cepheids (DCEPs) represent a fundamental tool to calibrate the extragalactic distance scale. However, they are also powerful stellar population tracers in the context of Galactic studies. The forthcoming Data Release 3 of the Gaia mission will allow us to study, with unprecedented detail, the structure, the dynamics, and the chemical properties of the Galactic disc, and in particular of the spiral arms, where most Galactic DCEPs reside. Aims. In this paper we aim to quantify the metallicity dependence of the Galactic DCEPs' period-Wesenheit (PWZ) relation in the Gaia bands. Methods. We adopted a sample of 499 DCEPs with metal abundances from high-resolution spectroscopy, in conjunction with Gaia Early Data Release 3 parallaxes and photometry to calibrate a PWZ relation in the Gaia bands. Results. We find a significant metallicity term, of the order of -0.5 mag dex–1, which is larger than the values measured in the near-infrared (NIR) bands by different authors. Our best PWZ relation is W = (-5.988 ± 0.018)-(3.176 ± 0.044)(log P - 1.0)-(0.520 ± 0.090)[Fe/H]. We validated our PWZ relations by using the distance to the Large Magellanic Cloud as a benchmark, finding very good agreement with the geometric distance provided by eclipsing binaries. As an additional test, we evaluated the metallicity gradient of the young Galactic disc, finding -0.0527 ± 0.0022 dex kpc–1, which is in very good agreement with previous results.

Abstract Copyright: © ESO 2022

Journal keyword(s): stars: variables: Cepheids - stars: distances - Galaxy: disk - Galaxy: abundances

VizieR on-line data: <Available at CDS (J/A+A/659/A167): table1.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* AC Cam cC* 03 23 47.8834711752 +59 21 20.417530464   14.14       ~ 33 0
2 V* AD Cam cC* 03 29 25.9697779560 +60 26 47.271788232   14.16       ~ 50 0
3 V* AB Cam cC* 03 46 08.2526949624 +58 47 03.203692080   13.08       F3Ibp 50 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16387 1
5 V* AA Gem cC* 06 06 34.9460908656 +26 19 45.202120572   11.0 9.91   8.540 K0 117 0
6 V* AD Gem cC* 06 43 07.5117403056 +20 56 20.799066228   10.42 9.80   9.044 F5 102 0
7 V* AA Mon cC* 06 57 23.7697706784 -03 50 36.027965220   14.07 12.740   11.081 ~ 49 0
8 V* AC Mon cC* 07 00 59.8200543168 -08 42 32.370161148   11.37 10.29     F5 80 0
9 V* AD Pup cC* 07 48 03.8512427256 -25 34 40.024315488   10.81 9.99     F8 104 0
10 V* AD Cru cC* 12 12 59.6675887128 -62 05 48.572123064   12.19 11.07     ~ 66 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13304 0
12 V* AA Ser cC* 18 41 21.7622577768 -01 06 40.402383372   14.54 12.09   9.572 K5 55 0

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2022.11.27-15:50:34

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