The decreasing period of EM Cygni

Details The decreasing period of EM Cygni The decreasing period of EM Cygni

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..748m&link_type=abstract

Astronomical Journal, vol. 85, June 1980, p. 748-750.

Astronomy and Astrophysics

Astronomy

9

Eclipsing Binary Stars, Periodic Variations, Stellar Rotation, Variable Stars, Light Curve, Mass Transfer, Stellar Mass Accretion

Scientific paper

Recent observed timings of the moments of minima of the double-lined, eclipsing, cataclysmic variable EM Cygni are discussed which confirm that the orbital period is currently decreasing. The timescale for the period change is calculated to be 5.5 million years, and on the assumption that all the mass is accreted onto the blue star, the rate of mass transfer is determined to be on the order of 2 x 10 to the -7th solar mass per year.

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