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- W92471902 abstract "RT CrB was categorized as one CVn-type system. In 1978, we made 1237 photoelectric observations in one colour of yellow band and 340 BV observations of RT CrB. Its light curve shows a wide scatter of about 0.07 magn., much larger than the standard deviation (～0.012 magn.); this is almost certainly due to the short time-scale internal variability of star. The mean light curve also shows clearly that there has a outstanding wave-like distortion outside of eclipse. Its amplitutes are～0.~m06 in V and～0.~m05 in B respectively. As compared with other observations, the distortion wave appears to be direct migration, motion towards increasing phase with a period of～18.5 years and a decreasing amplitude in recent years. So RT CrB would be the seeond case of direct migration, besides SS Boo, in RS CVn systems. Addition photometry is needed to comfirm this. After removing the distortion wave from light curve, we get a set of preliminary photometric elements of RT CrB with the Russell-Merrill method computing programm. The primary eclipse is shown to be the transit. The ratio of radii and orbital inclination are 0.975 and 84.°9, respectively. Available value of its mass obtained by Popper can be used to estimate the absolute radii of components: R_(pri)=2.91R_⊙, R_(sec)=2.84R_⊙, wich reveals a detached configuration of two subgiant components. From the Popper's list of provisional absolute paramaters, we plote eight RS CVn systems on a mass-radius diagram. All of them are above main sequence, and their primary and secondary components seem to be just divided into two groups along two different mass-radius relation curves. But the primary component of RT CrB and the secondary of TY Pyx have their particularity and deviate from these relations." @default.
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- W92471902 date "1982-06-01" @default.
- W92471902 modified "2023-09-22" @default.
- W92471902 title "RT CrB: WAVE-LIKE DISTORTION AND PHOTOMETRIC SOLUTION" @default.
- W92471902 hasPublicationYear "1982" @default.
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