Multiple wavelength microwave observations of the RS Canum Venaticorum stars UX Arietis, HR 1099, HR 5110, and II Pegasi

Journal Article · Thu Jan 01 00:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/164870· OSTI ID:6581574

Willson, R F; Lang, K R

The variabilities, core size and magnetic field of the RS CVn star UX Arietis was measured with the VLA at pairs of frequencies near 1415 MHz and 4835 MHz on June 10, 1985. Data were also gathered on HR 1099, HR 5110 and II Peg. UX Arietis exhibited variability on time scales ranging from 30 sec to 1 hr at 4835 MHz, but no detectable variations at 1415 MHz. An upper limit of 900 billion cm was placed on the size of the core emitting region, which is estimated to have a magnetic field strength of 15 G. The 30 sec variations are attributed to absorption by thermal plasma between the G5 and K1 companions of the UX Arietis system. 37 references.

• Research Organization: Tufts Univ., Medford, MA
• OSTI ID: 6581574
• Journal Information: Astrophys. J.; (United States), Vol. 312
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
VARIABLE STARS
MICROWAVE SPECTRA
BINARY STARS
COSMIC RADIO SOURCES
MAGNETIC FIELDS
POLARIZATION
STAR MODELS
SYNCHROTRON RADIATION
VARIATIONS
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
MATHEMATICAL MODELS
RADIATIONS
SPECTRA
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources