22 citations · 23 across the 5 of their papers we have counts for
5 papers
Improved parameters of the hydrogen-deficient binary star KSPer
Tonu Kipper, Valentina Klochkova
Using the high resolution spectral observations obtained with the Nasmyth Echelle Spectrograph NES of the 6m telescope we analysed the optical spectrum of the hydrogen-deficient bi…
A cool R Coronae Borealis star Z UMi
Tonu Kipper, Valentina Klochkova
The high resolution spectra of a R CrB type star Z UMi are analysed. The atmospheric parameters of Z UMi are estimated: Teff=5250+/-250K and log g=0.5+/-0.3. This places Z UMi amon…
The optical spectrum of R Coronae Borealis close to 2003 decline
Tonu Kipper, Valentina Klochkova
Two sets of high-resolution spectra of R CrB obtained during the 2003 light decline are described. The first set was obtained on the descending branch of the light curve when V ~12…
Optical spectroscopy of RU Cam, a pulsating carbon star
Tonu Kipper, Valentina Klochkova
We analysed the high resolution spectra of a RU Cam, classified as W Vir type star. The atmospheric parameters of RU Cam were estimated Teff=5250K and log g=1.0. The hydrogen defic…
The rapid evolution of the born-again giant Sakurai's object
M. Asplund, D. L. Lambert, T. Kipper +2
The extraordinarily rapid evolution of the born-again giant Sakurai's object can be traced both in a continued cooling of the stellar surface and dramatic changes in chemical compo…