Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..647b&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, July 1986, p. 647-650.
Astronomy and Astrophysics
Astronomy
9
Binary Stars, Stellar Orbits, Variable Stars, Cassegrain Antennas, Giant Stars, Precision, Semiregular Variable Stars, Stellar Spectra
Scientific paper
Based on 26 observations obtained between 1977 and 1985 with the Cassegrain and coude spectrographs, revised orbital elements for the semiregular variable RR U Mi are presented, including a period of 748.9 days, T = JD2444419, e = 0.13, V(0) = 6.2 km/s, and alpha sin i = 8.4 x 10 to the 7th km/s. The reduction in the mean errors of single observations and the uncertainties in individual elements are not as great as expected, and a limit to precision may be set by radial motions within the atmosphere of the M star which are related to the variability of the star. No feature is noted in the spectrum that can be ascribed to a secondary spectrum.
Batten Alan H.
Fletcher Murray J.
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