The spectroscopic and eclipsing binary AD Herculis

Details The spectroscopic and eclipsing binary AD Herculis The spectroscopic and eclipsing binary AD Herculis

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..312b&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, June-July 1978, p. 312-317.

Astronomy and Astrophysics

Astronomy

9

Eclipsing Binary Stars, Stellar Motions, Stellar Spectrophotometry, Orbital Elements, Roche Limit

Scientific paper

Twenty-six spectrograms of the eclipsing binary AD Her obtained at dispersions of 15 and 30 A/mm are analyzed. All available determinations of times of minima are collected, corrections to previous values of the period and epoch are determined, and a revised period and epoch are given along with their mean errors. The orbital elements of Ad Her are derived from 24 of the 26 observations, and the velocity curve is shown to be well-defined. An apparently genuine orbital eccentricity is obtained from the velocity curve. The observed mass function of 0.057 solar mass is found to be consistent with the earlier conclusion that the secondary star nearly fills its Roche lobe, and it is suggested that the secondary may fill or even exceed its Roche lobe near periastron but may be detached from the lobe near apastron. Radii of 3 and 9 solar radii are estimated for the primary and secondary, respectively.

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