The radio light curve of FK Comae at 3. 6 cm

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Astronomical Journal; (United States)

DOI:https://doi.org/10.1086/115842· OSTI ID:5588422

Rucinski, S M ^[1]

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1. Institute for Space and Terrestrial Science York University, Toronto (Canada)

The VLA radio telescope was used to obtain 29 X-band (3.6 cm) observations of the very active, rapidly rotating giant FK Comae over three weeks in October 1989. A brightening from the usual 1-2 mJy to about 12 mJy which lasted about 5 days was observed at the beginning of the run. The brightening seemed to be modulated by the 2.4 day rotation of the star with the maximum of the radio flux at the predicted optical light maximum. The circularly polarized flux (Stokes parameter V) did not exactly follow changes of the flux f (Stokes parameter I), suggesting that separate flares but at the same active longitude were observed. Determinations of the degree of circular polarization V/I had low accuracy except during phases of the brightenings when V/I is not greater than + 0.1 was observed. 20 refs.

• OSTI ID: 5588422
• Journal Information: Astronomical Journal; (United States), Journal Name: Astronomical Journal; (United States) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTENNAS
BRIGHTNESS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
GIANT STARS
LUMINOSITY
MOTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POLARIZATION
RADIATIONS
RADIO EQUIPMENT
RADIO TELESCOPES
RADIOWAVE RADIATION
ROTATION
STARS
STELLAR ACTIVITY
TELESCOPES