Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l.107c&link_type=abstract
Astrophysical Journal, vol. 206, June 1, 1976, pt. 2, p. L107-L111.
Astronomy and Astrophysics
Astronomy
29
Binary Stars, Radio Interferometers, Radio Sources (Astronomy), Variable Stars, Algol, Brightness Temperature, Size (Dimensions)
Scientific paper
For 8 hours during a strong radio flare on Jan. 15, 16, 1975, the close binary system Beta Persei (Algol) was observed with a three-station VLBI array operating at 7850 MHz. The size of the radio source was estimated to have been about 1.7 milliarcsec (0.05 AU), based on a model of a uniformly bright disk. The corresponding brightness temperature was nearly 10 billion K, indicating that the emission was probably nonthermal. There was no evidence for expansion of the source; the upper limit on the rate of any expansion was 100 km/s. The position of the Algol radio source with respect to an extragalactic reference frame was also determined from these observations with an uncertainty of about 0.1 arcsec in each coordinate.
Clark Thomas A.
Hinteregger Hans F.
Hutton L. K.
Knight Charles A.
Ma Caiwen
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