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Quantitative Spectroscopic J-Band Study of Red Supergiants in Perseus Ob-1

Gazak, JZ, Davies, B, Kudritzki, R, Bergemann, M and Plez, B (2014) Quantitative Spectroscopic J-Band Study of Red Supergiants in Perseus Ob-1. Astrophysical Journal, 788 (1). ISSN 0004-637X

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Abstract

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 χ 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 non-LTE (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 λ/δλ 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 10 times farther by observing the integrated light of unresolved super star clusters.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 20 May 2019 10:29
Last Modified: 20 May 2019 10:30
DOI or Identification number: 10.1088/0004-637X/788/1/58
URI: http://researchonline.ljmu.ac.uk/id/eprint/10730

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