%0 Journal Article
%T Quantitative Spectroscopic J-band Study of Red Supergiants in Perseus OB-1
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%A Gazak, J. Zachary
%A Davies, Ben
%A Kudritzki, Rolf
%A Bergemann, Maria
%A Plez, Bertrand
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 788
%N 1
%P 58
%8 2014-06-10
%D 2014
%Z 1404.5713
%R 10.1088/0004-637X/788/1/58
%Z Physics [physics]/Astrophysics [astro-ph]Journal articles
%X We demonstrate how the metallicities of red supergiant (RSG) stars can be measured from quantitative spectroscopy down to resolutions of ~3000 in the J-band. We have obtained high resolution spectra on a sample of the RSG population of h and chi Persei, a double cluster in the solar neighborhood. We show that careful application of the MARCS model atmospheres returns measurements of Z consistent with solar metallicity. Using two grids of synthetic spectra--one in pure LTE and one with NLTE calculations for the most important diagnostic lines--we measure Z = +0.04 +/- 0.10 (LTE) and Z = -0.04 +/- 0.08 (NLTE) for the sample of eleven RSGs in the cluster. We degrade the spectral resolution of our observations and find that those values remain consistent down to resolutions of less than R of 3000. Using measurements of effective temperatures we compare our results with stellar evolution theory and find good agreement. We construct a synthetic cluster spectrum and find that analyzing this composite spectrum with single-star RSG models returns an accurate metallicity. We conclude that the RSGs make ideal targets in the near infrared for measuring the metallicities of star forming galaxies out to 7-10 Mpc and up to ten times farther by observing the integrated light of unresolved super star clusters.
%G English
%L hal-01972087
%U https://hal.science/hal-01972087
%~ IN2P3
%~ CNRS
%~ UNIV-MONTP2
%~ LUPM
%~ MIPS
%~ UNIV-MONTPELLIER
%~ LUPM_AS
%~ UM1-UM2