Four Year Modulation of Periodic Radio Outbursts from LSI +61 degrees 303
Abstract
New 6 cm observations of the binary radio, X-ray, and gamma-ray star LSI + 61 deg 303 obtained in August 1984 and September 1986 are presented. The data accumulated to date provide evidence for a strong modulation in the amplitude of the 26.496 day periodic radio outbursts. The modulation occurs on a time scale of 4 yr. Two possible explanations are considered: (1) variable beaming from a precessing relativistic jet and (2) variable accretion due to quasi-cyclic Be star envelope variations.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1989
- DOI:
- 10.1086/167359
- Bibcode:
- 1989ApJ...339.1054G
- Keywords:
-
- B Stars;
- Ephemeris Time;
- Radio Stars;
- Stellar Activity;
- Variable Stars;
- X Ray Binaries;
- Airglow;
- Least Squares Method;
- Signal To Noise Ratios;
- Astrophysics;
- RADIO SOURCES: VARIABLE;
- STARS: INDIVIDUAL ALPHANUMERIC: LSI;
- 61 DEGREES 303;
- X-RAYS: BINARIES