Infrared observations of highly variable radio sources in the galactic plane

Details Infrared observations of highly variable radio sources in the galactic plane Infrared observations of highly variable radio sources in the galactic plane

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..883n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 4, p. 883-892.

Astronomy and Astrophysics

Astronomy

3

Binary Stars, Infrared Astronomy, Infrared Imagery, Infrared Stars, Radio Sources (Astronomy), Radio Stars, Sky Surveys (Astronomy), Very Large Array (Vla)

Scientific paper

We have performed a comprehensive infrared imaging survey of 29 radio sources which were first detected by the UBC radio patrol survey of the galactic plane. The sources in our sample are the subset of variable and nonvariable 'control' objects which were mapped with the VLA by Duric & Gregory (1988). Since other sources in the original variability survey have been shown to be associated with unusual galactic X-ray and gamma-ray sources, the aim of the present work was to make the first steps towards discovering whether the remaining radio variables represent a hitherto undetected sample of faint, unusual X-ray binary stars. As a result, we have detected infrared sources coincident with seven of these radio objects and have varying degrees of confidence in their status as true counterparts. The infrared objects are typically far redder than surrounding stars in the same fields (J-K is approximately equal to 2.5), and are generally invisible on the optical sky survey plates. In addition to this, as a result of scanning the POSS plates, we have uncovered optical candidates coincident with five radio positions. Most of these optical sources are close to the plate limiting magnitudes and only two objects are common between the sets of infrared and optical candidates.

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