Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104.1177r&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 682, p. 1177-1186.
Astronomy and Astrophysics
Astronomy
16
Binary Stars, Light Curve, Radio Stars, Very Large Array (Vla), Stellar Flares, Stellar Systems
Scientific paper
The close (P = 0.7 day) synchronized binary system ER Vulpeculae was observed 4 times for 11.5 h with the VLA system: twice in 1990, mostly at 6 cm with some data at 20 cm, and twice in 1991, most at 3.6 cm. The C- and X-band radio light curves revealed complex variability, a mixture of the slow (geometrical and/or slow magnetic structure evolution) and of the random (flaring) components. The expected rigid anchoring of the emitting structures to the binary system geometry was not observed. The 6-cm data showed a semiperiodicity of about 0.8 day whereas the 3.6-cm data seemed to indicate more short time-scale (flaring) variability which was modulated by the half-day visibility window at daily intervals. The flux levels were very similar at 3.6 and 6 cm in 1991 but were lower at 20 cm than at 6 cm in the 1990 data. There was an appreciable decrease in the 6-cm flux level between 1990 and 1991. No appreciable circular polarization was observed at any time.
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