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Parameters of the components of visually close binary systems: Hip 11352
Al-Wardat, M. A.
Model atmospheres of the components of the visually close binary system Hip 11352 were constructed using a grid of Kurucz's blanketed models. The entire observational spectral energy distribution of the system was used as a reference for the comparison with synthetic ones created from the model atmospheres. The parameters of the components of the …
New absolute magnitude calibrations for W Ursa Majoris type binaries
Demircan, O.; Eker, Z.; Bilir, S. +2 more
Parallaxes of W UMa stars in the Hipparcos catalogue have been analyzed. 31 W UMa stars, which have the most accurate parallaxes (σπ/π<0.15) which are neither associated with a photometric tertiary nor with evidence of a visual companion, were selected for re-calibrating the Period-Luminosity-Color (PLC) relation of W UMa stars. Usin…
The chromospherically active binary star EI Eridani: I. Absolute dimensions
Strassmeier, K. G.; Weber, M.; Granzer, T. +2 more
We present a detailed determination of the astrophysical parameters of the chromospherically active binary star EI Eridani. Our new radial velocities allow to improve the set of orbital elements and reveal long-term variations of the barycentric velocity. A possible third-body orbit with a period of {≈ 19} years is presented. Absolute parameters a…
Orbits of Comets C/1845 L1 (Great June Comet) and C/1846 D1 (de Vico)
Branham, R. L., Jr.
Orbits are calculated for Comet C/1845 L1 (the Great June Comet) and C/1846 D1 (de Vico), the former based on 157 observations in right ascension and 152 in declination and the latter on 10 and 9, respectively. Both orbits are hyperbolic and statistically distinguishable from parabolas. Statistical tests indicate that the residuals are random and …
Field optimization and CCD data simulation for the antarctic International Concordia Explorer Telescope (ICE-T)
Strassmeier, K. G.; Fügner, D.; Fuhrmann, C.
We performed extensive data simulations for the planned ultra-wide-field, high-precision photometric telescope ICE-T (International Concordia Explorer Telescope). ICE-T consists of two 60 cm-aperture Schmidt telescopes with a joint field of view simultaneously in two photometric bandpasses. Two CCD cameras, each with a single 10.3k×10.3k thinned b…