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Title: Absolute properties of the eclipsing binary star IM Persei

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.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4]
  1. Physics Department, University of Arkansas, Fayetteville, AR 72701 (United States)
  2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  3. Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209 (United States)
  4. Astrophysics Group, Keele University, Staffordshire, ST5 5BG (United Kingdom)
Publication Date:
OSTI Identifier:
22342151
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 149; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; DISTANCE; ECLIPSE; MASS; ORBITS; RADIAL VELOCITY; SPECTRA; VISIBLE RADIATION