Coordinated ultraviolet, optical, and radio observations of HR 1099 and UX Arietis
- Princeton Univ., NJ
Simultaneous radio, visual, and ultraviolet observations of the RS Canum Venaticorum binaries UX Arietis and HR 1099 are reported. The joint program covered the interval 1976 September 22 through October 3. The observations consisted of radio flux density measurements at 1660, 2695, and 8085 MHz; uv spectrophotometry of L..cap alpha.. and Mg II h and k; H..cap alpha.. and Ca II H and K spectroscopy; V-band photometry; and UBV polarimetry. A quasi-sinusoidal variation in V was observed in both systems. The period of this variation was approximately equal to the orbital period. No significant optical polarization was observed from either system. Variable radio emission was detected from both binaries throughout the program. Variable H..cap alpha.. and L..cap alpha.. emission were observed from HR 1099. UX Ari also exhibited L..cap alpha.. emission. Multiple Mg II emission components with peculiar velocities up to 250 km s/sup -1/ were often seen from both systems. Each Mg II observation also exhibited a strong and variable central velocity component which always seemed to match the orbital velocity of the more massive star in each system. HR 1099 exhibited strong Ca II H and K emission which was not significantly variable. The joint observations provide strong evidence for chromospheric activity associated with the more massive star in each binary. Although the radio emission is produced in a larger volume than the optical and uv activity, temporal correlations suggest that a physical connection may exist between the two phenomena. 14 figures, 2 tables.
- OSTI ID:
- 6137039
- Journal Information:
- Astrophys. J.; (United States), Vol. 225:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
BINARY STARS
EMISSION SPECTRA
PHOTOMETRY
POLARIZATION
RADIOWAVE RADIATION
ULTRAVIOLET SPECTRA
FLUX DENSITY
GHZ RANGE 01-100
LUMINOSITY
LYMAN LINES
STELLAR ATMOSPHERES
VISIBLE SPECTRA
ATMOSPHERES
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
GHZ RANGE
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources
640103 - Astrophysics & Cosmology- Quasi-Stellar
Radio
& X-Ray Sources- (-1987)