Carbon stars as standard candles. I. Virtual Observatory Resource

Authors
  1. Ripoche P.
  2. Heyl J.
  3. Parada J.
  4. Richer H.
  5. Published by
    CDS
Abstract

Our goal in this paper is to derive a carbon-star luminosity function that will eventually be used to determine distances to galaxies at 50-60 Mpc and hence yield a value of the Hubble constant. Cool N-type carbon stars exhibit redder near-infrared colours than oxygen-rich stars. Using Two Micron All Sky Survey near-infrared photometry and the Gaia Data Release 2, we identify carbon stars in the Magellanic Clouds (MC) and the Milky Way (MW). Carbon stars in the MC appear as a distinct horizontal feature in the near-infrared ((J-K_s_)_0_, M_J_) colour-magnitude diagram. We build a colour selection (1.4<(J-K_s_)_0_<2) and derive the luminosity function of the colour-selected carbon stars. We find the median absolute magnitude and the dispersion, in the J band, for the Large and the Small Magellanic Clouds (LMC/SMC) to be, respectively, (M_J_=-6.284+/-0.004 and {sigma}=0.352+/-0.005) and (M_J_=-6.160+/-0.015 and {sigma}=0.365+/-0.014). The difference between the MC may be explained by the lower metallicity of the SMC, but in any case it provides limits on the type of galaxy whose distance can be determined with this technique. To account for metallicity effects, we developed a composite magnitude, named C, for which the error-weighted mean C magnitude of the MC are equal. Thanks to the next generation of telescopes (JWST, ELT, and TMT), carbon stars could be detected in MC-type galaxies at distances out to 50-60Mpc. The final goal is to eventually try and improve the measurement of the Hubble constant while exploring the current tensions related to its value.

Keywords
  1. Magellanic Clouds
  2. Carbon stars
  3. Infrared photometry
Bibliographic source Bibcode
2020MNRAS.495.2858R
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/495/2858
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/495/2858

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/495/2858
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/495/2858
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/495/2858
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http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/2858/lmc2mass?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/2858/lmc2mass?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/2858/lmc2mass?
IVOA Cone Search SCS
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http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/2858/smc2mass?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/2858/smc2mass?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/2858/smc2mass?

History

2021-12-10T12:54:49Z
Resource record created
2021-12-10T12:54:49Z
Created
2022-03-21T07:13:17Z
Updated

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