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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 |
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| 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: | 04 Sep 2021 09:23 |
| DOI or ID number: | 10.1088/0004-637X/788/1/58 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/10730 |
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