Detection of 6-cm radio-continuum emission from an EB (β-Lyrae type) variable star – HIP 68718 |
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| Authors: | M W B Anderson M D Filipovi&#; |
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| Institution: | Sydney Observatory, PO Box K346, Haymarket, Sydney, NSW 1238, Australia;University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia |
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| Abstract: | We report the 6-cm radio-continuum detection of a previously unknown radio star, HIP 68718, identified by the Hipparcos satellite as an EB or β-Lyrae type optical variable. Only five prior radio detections of this type are reported in the literature. The radio source (VLA J140402?002145) was detected at the 6σ level, with an associated <1 arcsec position error. The radio-optical separation is 0.2 arcsec and is well within the position errors. A ROSAT X-ray source (RXJ 1404.0?0021) is located 4.5 arcsec from the radio position. Based on the component spectral types (F5V + G5V), 1.52 d period, variations in the peak of the light curve and the X-ray and 6-cm radio luminosities, we conclude the star is a candidate RS CVn. The binary is in a near-contact phase based on the asymmetric light curve (O'Connell effect). Evidence of two faint possible companion objects was also found in the J - and K -band Two-Micron All-Sky Survey images. |
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| Keywords: | binaries: eclipsing stars: individual: MR Vir radio continuum: stars |
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