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Absolute Properties Of The Eclipsing Binary Star Im Persei

Sandberg Lacy, Claud H.; Torres, Guillermo; Fekel, Francis C.; Muterspaugh, Matthew W.; Southworth, John

Absolute Properties Of The Eclipsing Binary Star Im Persei Thumbnail


Claud H. Sandberg Lacy

Guillermo Torres

Francis C. Fekel

Matthew W. Muterspaugh


IM Per is a detached A7 eccentric eclipsing binary star. We have obtained extensive measurements of the light curve (28,225 differential magnitude observations) and radial velocity curve (81 spectroscopic observations) which allow us to fit orbits and determine the absolute properties of the components very accurately: masses of 1.7831 ± 0.0094 and 1.7741 ± 0.0097 solar masses, and radii of 2.409 ± 0.018 and 2.366 ± 0.017 solar radii. The orbital period is 2.25422694(15) days and the eccentricity is 0.0473(26). A faint third component was detected in the analysis of the light curves, and also directly observed in the spectra. The observed rate of apsidal motion is consistent with theory (U = 151.4 ± 8.4 year). We determine a distance to the system of 566 ± 46 pc.

Journal Article Type Article
Acceptance Date Oct 28, 2014
Online Publication Date Jan 5, 2015
Publication Date Jan 5, 2015
Journal Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 149
Issue 1
Article Number 34
Keywords binaries: eclipsing, binaries: spectroscopic, stars: fundamental parameters, stars: individual (IM Per)
Publisher URL


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