One milliarcsecond precision studies in the regions of Delta Equulei and Chi1 Orionis

Details One milliarcsecond precision studies in the regions of Delta Equulei and Chi1 Orionis One milliarcsecond precision studies in the regions of Delta Equulei and Chi1 Orionis

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..138g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 106, no. 696, p. 138-144

Astronomy and Astrophysics

Astronomy

5

Astrometry, Binary Stars, Stellar Orbits, Stellar Parallax, Astronomical Interferometry, Photographic Measurement, Stellar Spectrophotometry

Scientific paper

Trigonometric parallaxes for stars in the regions of the binary stars Delta Equulei (HR 8123) and Chil Orionis (HR 2047) are derived from data collected with the Multichannel Astrometric Photometer (MAP) and the Thaw Refractor of the University of Pittsburgh's Allegheny Observatory. The weighted mean parallax of all trigonometric studies of delta Equ is now +5.42 +/- 0.93 mas, corresponding to absolute magnitudes of 3.87 +/- 0.04 and 3.95 +/- 0.04 mag, respectively, for the primary and secondary. Using the Popper and Dworetsky orbit we find a photocentric semimajor axis of 2.9 +/- 0.8 mas and individual masses of 1.21 +/- 0.090 and 1.19 +/- 0.088 solar masses, respectively, for the primary and secondary components. The weighted mean trigonometric parallax of all studies of the binary star Chil Ori is +111.0 +/- 0.92 mas, implying an absolute visual magnitude for the dominant GO V primary of 4.63 +/- 0.018 mag. The photocentric semimajor axis, derived from a fraction of the orbit, is 96.9 +/- 5.4 mas.

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