The Spectroscopic Orbit of δ Andromedae
Abstract
A total of 32 radial-velocity determinations made over the last 75 years are used to derive the period and orbital elements of delta And, a visual binary that may also be a spectroscopic pair. A period of about 41 years (15,000 days) is derived from a plot of velocity vs time, the phases are computed as a function of Julian day of observation and period, and the velocity curve is plotted. Based on the mass function and reasonable assumptions about the masses of the components, the inclination of the orbital plane is estimated to be 20 deg and the semimajor axis of the relative orbit is estimated as 47 AU. It is concluded that delta And is, in fact, a spectroscopic binary and that the velocity curve is now on its ascending branch and approaching a maximum.
- Publication:
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Journal of the Royal Astronomical Society of Canada
- Pub Date:
- February 1976
- Bibcode:
- 1976JRASC..70...23B
- Keywords:
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- Astronomical Spectroscopy;
- Binary Stars;
- Orbital Elements;
- Radial Velocity;
- Orbit Calculation;
- Stellar Rotation;
- Astronomy