SIMBAD references

2018ApJ...860..130B - Astrophys. J., 860, 130-130 (2018/June-3)

Quantitative spectroscopy of supergiants in the Local Group dwarf galaxy IC 1613: metallicity and distance.

BERGER T.A., KUDRITZKI R.-P., URBANEJA M.A., BRESOLIN F., GIEREN W., PIETRZYNSKI G. and PRZYBILLA N.

Abstract (from CDS):

We present a spectral analysis of 21 blue supergiant stars of spectral types late B to early A within the Local Group dwarf galaxy IC 1613, based on VLT Focal Reducer and Low Dispersion Spectrograph 2 low-resolution spectra. Combining our results with studies of early B-type blue supergiants, we report a wide bimodal distribution of metallicities with two peaks around [Z] ∼ -0.50 dex and [Z] ∼ -0.85 dex. The bimodal distribution correlates with spatial location, when compared with column densities of neutral hydrogen in IC 1613. While the low [Z] objects appear in regions of relatively high ISM H I column densities or close to them, the high [Z] supergiants are found in the central H I hole that is almost devoid of hydrogen. This suggests there are varied chemical evolution histories for the young stellar populations in IC 1613. Utilizing the flux-weighted gravity-luminosity relation, we determine IC 1613's distance modulus as m - M = 24.39 ± 0.11 mag. This value is in agreement within previous distance measurements using the near-infrared period-luminosity relationship of Cepheids and the tip of the red giant branch.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: distances and redshifts - galaxies: evolution - galaxies: individual: IC 1613 - stars: fundamental parameters - supergiants

Simbad objects: 32

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2019.10.17-18:44:02

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