An unseen companion to 36 Ursae Majoris A from analysis of plates taken with the Sproul 61-cm refractor.
Abstract
Astrometric analysis of plates taken on 36 UMa A with the Sproul 61-cm refractor indicate variable proper motion which can be explained by Kepler motion for a photocentric orbit with a period of 18 years. An unseen red-dwarf companion is indicated with a mass of about 0.07 solar mass. This additional companion makes the 36 UMa system at least quadruple. The Sproul relative parallax of the system is + 0.0738 arscec + or - 0.0028 arcsec as determined by the A component.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1983
- DOI:
- 10.1086/131252
- Bibcode:
- 1983PASP...95..775L
- Keywords:
-
- Astrometry;
- Eclipsing Binary Stars;
- Red Dwarf Stars;
- Stellar Spectrophotometry;
- Kepler Laws;
- Photographic Plates;
- Stellar Mass;
- Stellar Parallax;
- Astronomy