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

Bibcode
2012A&A...544A.152C
DOI
10.1051/0004-6361/201219712
Calamida, A.; Monelli, M.; Milone, A. P.; Bono, G.; Pietrinferni, A.; Lagioia, E. P.
Bibliographical reference

Astronomy and Astrophysics, Volume 544, id.A152

Advertised on:
8
2012
Journal
Astronomy and Astrophysics
Number of authors
6
IAC number of authors
2
Citations
5
Refereed citations
4
Description
We present a theoretical calibration of a new metallicity diagnostic based on the Strömgren 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 = 0.3 dex. 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 = 0.30 dex) and -0.47 ± 0.01 (σ = 0.42 dex), respectively.
Related projects
NGC 2808 Globular Cluster
Milky Way and Nearby Galaxies

The general aim of the project is to research the structure, evolutionary history and formation of galaxies through the study of their resolved stellar populations, both from photometry and spectroscopy. The group research concentrates in the most nearby objects, namely the Local Group galaxies including the Milky Way and M33 under the hypothesis

Martín
López Corredoira
Closed
Type
Refereed
The Milky Way and the Local Group (MWLG)

It may interest you

  • Refereed
    The discovery space of ELT-ANDES. Stars and stellar populations

    The ArmazoNes high Dispersion Echelle Spectrograph (ANDES) is the optical and near-infrared high-resolution echelle spectrograph envisioned for the Extremely Large Telescope (ELT). We present a selection of science cases, supported by new calculations and simulations, where ANDES could enable major advances in the fields of stars and stellar

    Roederer, Ian U. et al.

    Advertised on:

    4
    2024
    Bibcode
    2024ExA....57...17R
    Citations
    0
  • Refereed
    Euclid preparation. XXXVI. Modelling the weak lensing angular power spectrum

    This work considers which higher order modeling effects on the cosmic shear angular power spectra must be taken into account for Euclid. We identified the relevant terms and quantified their individual and cumulative impact on the cosmological parameter inferences from Euclid. We computed the values of these higher order effects using analytic

    Euclid Collaboration et al.

    Advertised on:

    4
    2024
    Bibcode
    2024A&A...684A.138E
    Citations
    4
  • Refereed
    The compact multi-planet system GJ 9827 revisited with ESPRESSO★

    GJ 9827 is a bright, nearby K7V star orbited by two super-Earths and one mini-Neptune on close-in orbits. The system was first discovered using K2 data and then further characterized by other spectroscopic and photometric instruments. Previous literature studies provide several mass measurements for the three planets, however, with large variations

    Passegger, V. M. et al.

    Advertised on:

    4
    2024
    Bibcode
    2024A&A...684A..22P
    Citations
    1