Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cha%26a...6...24j&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 6, Issue 1, p. 24-27.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Six times of maxima of the ultrashort-period cepheid variable EH Librae were measured in 1980 May to June and in 1981 January, with a three-channel photocounting high-speed photoelectric photometer. These, together with all the photoelectric times of maxima over the past 30 years, are used to re-examine the nature of the change of the period. We found that we can fix the times of maxima by the following formula Tmax = T0+P0E+1/2βE2+Asin2π(EP0/E0) where T0 = HJD 2433438.6088 and P0 = 0.0884132445 d represent the initial maximum epoch and the pulsation period, β = -2.8 × 10-8/yr A = 0.0015 d, P0 = 6251 d = 17.1 yr are the semi-amplitude and the period of the sine curve, and E is the number of periods elapsed since T0, and (E0 = 70700).
If we interpret this 17.1 year periodicity as a modulation of the phase of maximum by binary motion, then the semi-amplitude of the orbital radial velocity variation is K = 2πasini/E0 = 0.45 km/s and the mass function is f(m)=m32sin3i/(m1m2)2=(asini)3/E20=6 x 10-5Msolar
Jiang Shi-Yang
Yang Zheng-Zhong
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