2012A&A...544A.152C


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.25CET16:17:59

2012A&A...544A.152C - Astronomy and Astrophysics, volume 544A, 152-152 (2012/8-1)

A new visual - near-infrared diagnostic to estimate the metallicity of cluster and field dwarf stars.

CALAMIDA A., MONELLI M., MILONE A.P., BONO G., PIETRINFERNI A. and LAGIOIA E.P.

Abstract (from CDS):

We present a theoretical calibration of a new metallicity diagnostic based on the Stroemgren index m1 and on visual - near-infrared (NIR) colors to estimate the global metal abundance of cluster and field dwarf stars. To perform the metallicity calibration we adopt α-enhanced evolutionary models transformed into the observational plane by using atmosphere models computed adopting the same chemical mixture. We apply the new visual-NIR metallicity-index-color (MIC) relations to two different samples of field dwarfs and we find that the difference between photometric estimates and spectroscopic measurements is on average smaller than 0.1 dex, with a dispersion smaller than σ=0.3dex. We apply the same MIC relations to a metal-poor (M 92) and a metal-rich (47 Tuc) globular cluster. We find a peak of -2.01±0.08 (σ=0.30dex) and -0.47±0.01 (σ=0.42dex), respectively.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - stars: Population II - stars: low-mass

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3489 0
2 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2605 0
3 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1880 0
4 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2482 0
5 NAME Galactic Bulge reg ~ ~           ~ 3283 0

    Equat.    Gal    SGal    Ecl

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2020.01.25-16:17:59

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