Summary: Mon. Not. R. Astron. Soc. 000, 000--000 (0000) Printed 7 August 1997 (MN L a T E X style file v1.4)
Evidence for an intra­binary radio emission region in the
Algol system V505 Sagitarii
A. G. Gunn 1;2 , V. Migenes 3? , J. G. Doyle 2 and R. E. Spencer 1
1 University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Lower Withington, Cheshire, SK11 9DG, UK
2 Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland
3 ATNF, P. O. Box 76, Epping, NSW 2121, Australia
Accepted 1997 Received 1997 in original form August 1997
ABSTRACT
We present radio interferometric observations of the Algol­type binary system V505
Sagitarii made with the ATNF Compact Array at 6 cm and 3.6 cm over one orbital
cycle (1.18 days). We obtained a strong detection of the source (1.5 mJy at 6 cm and
1.4 mJy at 3.6 cm). The radio flux level shows a clear modulation with evidence of
eclipses of the emission region at both conjunctions of the binary which may indicate
the existence of an intra­binary region of activity. This has important consequences
for the details of coronal formation and field interaction in active close binary stars.
Key words: stars: activity ­ binaries: close ­ stars: flare ­ stars: late type ­ stars:
variables: other ­ radio continuum: stars
1 INTRODUCTION
The Algol­type binaries (McCluskey 1993; Batten 1981; Shu

Source: Armagh Observatory

Collections: Physics