Radioastronomical observation of UV CETI stars
Abstract
The UV Ceti-type stars V371 Ori, YZ CMi, AD Leo, Wolf 424, BD + 16 deg 2708, Ross 867, G25-16, EQ Peg, and G3-33 were monitored in the time period October 20, 1973 to August 5, 1974. The decimetric wavelength observations may be categorized as radiometry, polarimetry, simultaneous optical-radio observations, and a search for long time scale variations. More than 70 flare events were observed during the project. There appear to be two classes of events based on flare duration: (1) impulsive events with half power durations ranging from a few seconds to 1 or 2 min, and (2) longer duration flares with half power durations of 10 min or longer. Observed amplitudes for both classes of events at 430 MHz ranged from the detection limit of a few hundredths of a flux unit to 0.6 flux units. Rates of occurrence of impulsive events are comparable to optical detection rates. Spectral indices derived from simultaneous observations at 318 and 196 MHz tend to be strongly nonthermal with a range of -1.3 to -7.2.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1975
- Bibcode:
- 1975PhDT.........7S
- Keywords:
-
- Astronomical Observatories;
- Constellations;
- Stars;
- Ultraviolet Radiation;
- Radio Observation;
- Radio Sources (Astronomy);
- Radiometers;
- Astronomy