A revised spectroscopic orbit for RR Ursae Minoris

Details A revised spectroscopic orbit for RR Ursae Minoris A revised spectroscopic orbit for RR Ursae Minoris

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.

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