SIMBAD references

2013ApJ...779L..20K - Astrophys. J., 779, L20 (2013/December-3)

A direct stellar metallicity determination in the disk of the maser galaxy NGC 4258.

KUDRITZKI R.-P., URBANEJA M.A., GAZAK Z., MACRI L., HOSEK M.W.Jr, BRESOLIN F. and PRZYBILLA N.

Abstract (from CDS):

We present the first direct determination of a stellar metallicity in the spiral galaxy NGC 4258 (D = 7.6 Mpc) based on the quantitative analysis of a low-resolution (∼5 Å) Keck Low Resolution Imaging Spectrograph spectrum of a blue supergiant star located in its disk. A determination of stellar metallicity in this galaxy is important for the absolute calibration of the Cepheid period-luminosity relation as an anchor for the extragalactic distance scale and for a better characterization of its dependence as a function of abundance. We find a value 0.2 dex lower than solar metallicity at a galactocentric distance of 8.7 kpc, in agreement with recent H II region studies using the weak forbidden auroral oxygen line at 4363 Å. We determine the effective stellar temperature, gravity, luminosity, and line-of-sight extinction of the blue supergiant being studied. We show that it fits well on the flux-weighted gravity-luminosity relation, strengthening the potential of this method as a new extragalactic distance indicator.

Abstract Copyright:

Journal keyword(s): galaxies: distances and redshifts - galaxies: individual: NGC 4258 - stars: abundances - stars: early-type - supergiants

Simbad objects: 10

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2013ApJ...779L..20K and select 'bookmark this link' or equivalent in the popup menu


2019.10.18-02:16:56

© Université de Strasbourg/CNRS

    • Contact