SIMBAD references

2014ApJ...788...58G - Astrophys. J., 788, 58 (2014/June-2)

Quantitative spectroscopic j-band study of red supergiants in Perseus OB-1.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - infrared: stars - open clusters and associations: individual: Perseus OB-1 - stars: abundances - stars: massive - supergiants - techniques: spectroscopic

Simbad objects: 21

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