Coronal activity from the ASAS eclipsing binaries

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dc.creatorSzczygiel, D. M.
dc.creatorSocrates, A.
dc.creatorPaczynski, B.
dc.creatorPojmanski, G.
dc.creatorPilecki, B.
dc.date2008-12-19
dc.date.accessioned2026-07-07T12:21:05Z
dc.date.available2026-07-07T12:21:05Z
dc.descriptionWe combine the catalogue of eclipsing binaries from the All Sky Automated Survey (ASAS) with the ROSAT All Sky Survey (RASS). The combination results in 836 eclipsing binaries that display coronal activity and is the largest sample of active binary stars assembled to date. By using the (V-I) colors of the ASAS eclipsing binary catalogue, we are able to determine the distances and thus bolometric luminosities for the majority of eclipsing binaries that display significant stellar activity. A typical value for the ratio of soft X-ray to bolometric luminosity is L_X/L_bol ~ a few x 10^-4, similar to the ratio of soft X-ray to bolometric flux F_X/F_bol in the most active regions of the Sun. Unlike rapidly rotating isolated late-type dwarfs -- stars with significant outer convection zones -- a tight correlation between Rossby number and activity of eclipsing binaries is absent. We find evidence for the saturation effect and marginal evidence for the so-called "super-saturation" phenomena. Our work shows that wide-field stellar variability searches can produce a high yield of binary stars with strong coronal activity. The combined ASAS and RASS catalogue, as well as the results of this work are available for download in a form of a file.
dc.description15 pages, accepted for publication in Acta Astronomica
dc.identifierhttps://arxiv.org/abs/0812.3909
dc.identifierhttp://arxiv.org/abs/0812.3909
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213255
dc.subjectAstrophysics
dc.titleCoronal activity from the ASAS eclipsing binaries
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