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Calculation of the new series of the Earth orientation parameters in the HIPPARCOS reference frame.
Vondrak, J.
The succesful lauchch of the HIPPARCOS astrometric satellite by the ESA in August 1989 enables the past observations, obtained by optical astrometry all over the world since the beginning of the century, to be re-reduced in order to get the Earth orientation parameters in a homogeneous and unique celestial reference frame. Completely new algorithm…
Properties and Nature of Be Stars. 14. Is KX And a Strongly Interacting Binary?
Harmanec, P.; Hadrava, P.; Koubsky, P. +5 more
This paper summarizes and adds to the observational knowledge of KX And, a peculiar emission-line object. A formal orbital solution, based on new Ondrejov and all previously published radial velocities of the metallic shell lines in the optical region has led to an improved ephemeris. Radial velocities of various lines measured in the IUE spectra …
EXOSAT X-ray and Optical Observations of the X-ray Source EXO 020528 + 1454.8 = G 035 - 027
Richter, G. A.; Hudec, R.; Wenzel, W. +8 more
Results of the Exosat X-ray observations and quasi-simultaneous optical photographic photometry of the X-ray source EXO 020528 + 1454.8 = 1 E 0205 + 149 are presented and discussed. The results indicate that the source is identical to the Lowell proper motion object G 035 - 027, a pair in which at least one but more probably both members are dMe f…
How Strong is the Evidence of Superionization and Large Mass Outflows in B/Be Stars? 2. The C IV and SI IV Lines in the UV Spectra of V 767 Cen, ο And, Θ CrB, λ Eri, and 59 CYG
Harmanec, P.; Hubeny, I.; Stefl, S.
The theoretical spectra in the neighborhood of the C IV and Si IV resonance lines have been compared with the published observed spectra of five Be stars, V 767 Cen, omicron And, Theta CrB, Lambda Eri, and 59 Cyg. It is shown that the published determinations of large outflow velocities evidenced by a violet asymmetry of the C IV and Si IV lines, …
Properties and Nature of Be Stars. 12. The UV Line Spectrum of KX And - Is There a Hot Primary?
Štefl, S.
Seven high-resolution IUE spectrograms of the Be star KX And were investigated by the standard method of comparison of the observed and theoretical spectra. The whole ultraviolet line spectrum can be described quite well by a model spectrum, corresponding to Kurucz's model with Teff = 9000 - 10000K and log g = 2.00. A detailed identific…