Astrometric and infrared speckle analysis of the visually unresolved binary BD +41 328.
Abstract
BD +41°328 (PCC 372), a solar-type 5th magnitude star at a distance of 14 parsecs was discovered to have an unseen companion from proper-motion analysis of astrometric plates taken with the Sproul 61-cm refractor, thus excluding it as a candidate for a solar planetary-type system. The combination of an improved photocentric orbit from recent astrometry and measurement of the companion's separation and brightness by infrared speckle interferometry at 2.2 microns indicates that the companion is a red dwarf with a mass of 0.38 ± 0.07Msun. It revolves around the primary with a period of 19.5 years and a semimajor axis of 8.9 ± 0.5 AU.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- April 1983
- DOI:
- 10.1086/131156
- Bibcode:
- 1983PASP...95..271L
- Keywords:
-
- Astrometry;
- Binary Stars;
- Infrared Astronomy;
- Interferometry;
- Speckle Patterns;
- Stellar Mass;
- Companion Stars;
- Dwarf Stars;
- Infrared Interferometers;
- Stellar Parallax;
- Astronomy