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Spectral population synthesis including massive binaries

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Eldridge, John J. and Stanway, Elizabeth R.. (2009) Spectral population synthesis including massive binaries. Monthly Notices of the Royal Astronomical Society, Vol.400 (No.2). pp. 1019-1028. ISSN 0035-8711

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Abstract

We have constructed a new code to produce synthetic spectra of stellar populations that includes massive binaries. We have tested this code against the broad-band colours of unresolved young massive stellar clusters in nearby galaxies, the equivalent widths of the Red and Blue Wolf–Rayet bumps in star-forming Sloan Digital Sky Survey galaxies and the ultraviolet and optical spectra of the star-forming regions Tol-A and B in NGC 5398. In each case, we find a good agreement between our models and observations. We find that in general binary populations are bluer and have fewer red supergiants, and thus significantly less flux in the I band and at longer wavelengths, than single star populations. Also we find that Wolf–Rayet stars occur over a wider range of ages up to 107 yr in a stellar population including binaries, increasing the ultraviolet flux and Wolf–Rayet spectral features at later times. In addition, we find that nebula emission contributes significantly to these observed properties and must be considered when comparing stellar models with observations of unresolved stellar populations. We conclude that incorporation of massive stellar binaries can improve the agreement between observations and synthetic spectral synthesis codes, particularly for systems with young stellar populations.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Double stars, Galaxies -- Spectra, Stars -- Evolution, Starbursts, Stars -- Clusters
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 2009
Volume: Vol.400
Number: No.2
Page Range: pp. 1019-1028
Identification Number: 10.1111/j.1365-2966.2009.15514.x
Status: Peer Reviewed
Publication Status: Published
Funder: Science and Technology Facilities Council (Great Britain) (STFC)
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URI: http://wrap.warwick.ac.uk/id/eprint/40081

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