64 ORI (= HR 2130L), a B-type tripple system

Details 64 ORI (= HR 2130L), a B-type tripple system 64 ORI (= HR 2130L), a B-type tripple system

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92.1162f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Nov. 1986, p. 1162-1167. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

6

B Stars, Binary Stars, Star Clusters, Stellar Spectra, High Dispersion Spectrographs, Line Spectra, Phase Deviation, Radial Velocity, Stellar Magnitude

Scientific paper

64 Ori is a close triple system consisting of three B stars which has recently been resolved by speckle interferometry. High-dispersion spectroscopic observations show that the probable visual primary is a double-lined spectroscopic binary with a period of 14.57221 days, which orbits a broad-lined (v sin i = 163 km s-1) third star with a period of 13.03 yr. From a consideration of magnitude differences and line-strength ratios the authors classify the components as B7 III, B8 III, and B5 V for the short-period primary, Aa, short-period secondary, Ab, and visual secondary, B, respectively. Components Aa and Ab both have v sin i ≤ 5 km s-1. Since it is shown that both are intrinsically slow rotators with no Hg-Mn abundance peculiarities, any mechanism which attempts to explain the presence of such peculiarities in late B stars must also explain their absence in these two stars.

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