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Full-Text Articles in Physical Sciences and Mathematics
The Nature Of The Light Variability Of The Silicon Star Hr 7224, Jiří Krtička, Zdeněk Mikulášek, Gregory W. Henry, Juraj Zverko, Jozef Žižňovský, Jan Skalický, Pavel Zvěřina
The Nature Of The Light Variability Of The Silicon Star Hr 7224, Jiří Krtička, Zdeněk Mikulášek, Gregory W. Henry, Juraj Zverko, Jozef Žižňovský, Jan Skalický, Pavel Zvěřina
Information Systems and Engineering Management Research Publications
Context. Although photometric variations of chemically peculiar (CP) stars are frequently used to determine their rotational periods, the detailed mechanism of their light variability remains poorly understood.
Aims. We simulate the light variability of the star HR 7224 using the observed surface distribution of silicon and iron.
Methods. We used the TLUSTY model atmospheres calculated for the appropriate silicon and iron abundances to obtain the emergent flux and to predict the rotationally modulated light curve of the star. We also obtained additional photometric measurements and employed our own regression procedure to derive a more precise estimate of the light elements. …
Infrared Spectroscopy Of Symbiotic Stars. Vii. Binary Orbit And Long Secondary Period Variability Of Ch Cygni, Kenneth H. Hinkle, Francis C. Fekel, Richard R. Joyce
Infrared Spectroscopy Of Symbiotic Stars. Vii. Binary Orbit And Long Secondary Period Variability Of Ch Cygni, Kenneth H. Hinkle, Francis C. Fekel, Richard R. Joyce
Information Systems and Engineering Management Research Publications
High-dispersion spectroscopic observations are used to refine orbital elements for the symbiotic binary CH Cyg. The current radial velocities, added to a previously published 13 year time series of infrared velocities for the M giant in the CH Cyg symbiotic system, more than double the length of the time series to 29 years. The two previously identified velocity periods are confirmed. The long period, revised to 15.6 ± 0.1 yr, is shown to result from a binary orbit with a 0.7 M☉ white dwarf and 2 M☉ M giant. Mass transfer to the white dwarf is responsible for the symbiotic …