Other
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.304..611g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 304, Issue 3, pp. 611-621.
Other
12
Stars: Activity, Binaries: Close, Stars: Flare, Stars: Late-Type, Stars: Variables: Other, Radio Continuum: Stars
Scientific paper
We present radio interferometric observations of the EA2 Algol-type binary system V505 Sagittarii made with the ATNF Compact Array at 6 and 3.6 cm over one orbital cycle (1.18 d). We have obtained a strong detection of the source (1.5 mJy at 6 cm and 1.4 mJy at 3.6 cm) and derive a brightness temperature for the emitting region of T_b ~ 2.7 x 10_9 K, a magnetic field strength of 17 < B < 170 G and an electron density of N_e ~ 3.7 x 10_8 cm_-3. The radio flux density levels show a clear modulation with evidence of eclipses of the emission region at both conjunctions of the binary. The form of the light curve implies that the radio source involves at least some enhanced emission in the intra-binary region. This has important consequences for the details of coronal formation and field interaction in active close binary stars. We discuss some scenarios for the formation of intra-binary active regions in Algol-type binary systems.
Brady P. A.
Doyle Gerry J.
Gunn Alastair G.
Migenes Victor
Spencer Ralph E.
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