Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.222..167h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 222, Sept. 1, 1986, p. 167-187. Research supported by t
Astronomy and Astrophysics
Astronomy
16
Eclipsing Binary Stars, Radial Velocity, Star Distribution, Three Body Problem, Variable Stars, Astronomical Photometry, Power Spectra, Spectrum Analysis, Stellar Color, Ubv Spectra
Scientific paper
Radial velocities derived from 40 medium-dispersion spectrograms acquired between 1970 and 1981, and light curves based on 440 UBV photometric observations, are presented for the truly Algol-type system DM Persei. The spectroscopic data yield a mass ratio of 0.32±0.02 for the binary, and show that it is part of a triple system with an orbital period of ≡100 day and semi-major axis ≡0.9 AU. The third component has a mass (for co-planar orbits) of ≡3.6 M_sun;, and since it is not readily detected in the observed spectrum, could possibly be a binary system itself. An analysis of the three light curves by means of the synthesis code LIGHT is performed and discussed. DM Per joins the small group of short-period early-type semi-detached massive systems, which include V Pup and u Her, whose characteristics differ significantly from the classical Algols.
Aikman Christopher L. G.
Carr D. M.
Hilditch Ron W.
Skillen Ian
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