Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-19
Astronomy and Astrophysics
Astrophysics
15 pages, accepted for publication in Acta Astronomica
Scientific paper
We 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.
Paczyński Bohdan
Pilecki Bogumil
Pojmański Grzegorz
Socrates Aristotle
Szczygiel Dorota M.
No associations
LandOfFree
Coronal activity from the ASAS eclipsing binaries does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Coronal activity from the ASAS eclipsing binaries, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronal activity from the ASAS eclipsing binaries will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-103632