Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Mkrtichian, D. E."'
Eclipsing, spectroscopic double-lined (SB2) binaries remain to be the prime source of precise and accurate fundamental properties of stars. Furthermore, high-cadence spectroscopic observations of the eclipse phases allow us to resolve the Rossiter-Mc
Externí odkaz:
http://arxiv.org/abs/2208.03072
Publikováno v:
A&A 644, A121 (2020)
RZ Cas is a short-period Algol-type system showing episodes of mass transfer and Delta Sct-like oscillations of its mass-gaining primary component. We analyse high-resolution spectra of RZ Cas that we obtained during a spectroscopic long-term monitor
Externí odkaz:
http://arxiv.org/abs/2011.07903
Autor:
Petrov, P. P., Grankin, K. N., Gameiro, J. F., Artemenko, S. A., Babina, E. V., de Albuquerque, R. M. G., Djupvik, A. A., Gahm, G. F., Shenavrin, V. I., Irsmambetova, T. R., Fernandez, M., Mkrtichian, D. E., Gorda, S. Yu.
Classical T Tauri stars with ages of less than 10 Myr possess accretion discs. Magnetohydrodynamic processes at the boundary between the disc and the stellar magnetosphere control the accretion and ejections gas flows. We carried out a long series of
Externí odkaz:
http://arxiv.org/abs/1811.08635
Publikováno v:
A&A 615, A131 (2018)
R Canis Majoris is the prototype of a small group of Algol-type stars showing short orbital periods and low mass ratios. A previous detection of short-term oscillations in its light curve has not yet been confirmed. We investigate a new time series o
Externí odkaz:
http://arxiv.org/abs/1804.04530
Autor:
Savanevych, V. E., Khlamov, S. V., Vavilova, I. B., Briukhovetskyi, A. B., Pohorelov, A. V., Mkrtichian, D. E., Kudak, V. I., Pakuliak, L. K., Dikov, E. N., Melnik, R. G., Vlasenko, V. P., Reichart, D. E.
The paper deals with a computational method for detection of the solar system minor bodies (SSOs), whose inter-frame shifts in series of CCD-frames during the observation are commensurate with the errors in measuring their positions. These objects ha
Externí odkaz:
http://arxiv.org/abs/1712.02425
RZ Psc is an isolated high-latitude post-T Tauri star that demonstrates a UX Ori-type photometric activity. The star shows very weak spectroscopic signatures of accretion, but at the same time possesses the unusual footprints of the wind in Na I D li
Externí odkaz:
http://arxiv.org/abs/1701.03312
Autor:
Hatzes, A. P., Cochran, W. D., Endl, M., Guenther, E. W., MacQueen, P., Hartmann, M., Zechmeister, M., Han, I., Lee, B. -C., Walker, G. A. H., Yang, S., Larson, A. M., Kim, K. -M., Mkrtichian, D. E., Doellinger, M., Simon, A. E., Girardi, L.
We investigate the nature of the long-period radial velocity variations in Alpha Tau first reported over 20 years ago. We analyzed precise stellar radial velocity measurements for Alpha Tau spanning over 30 years. An examination of the Halpha and Ca
Externí odkaz:
http://arxiv.org/abs/1505.03454
Auns. The aim of our paper is to investigate the low-amplitude and long-period variations in evolved stars with a precise radial velocity (RV) survey. Methods. The high-resolution, the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) was u
Externí odkaz:
http://arxiv.org/abs/1405.2127
Aims. We have been carrying out a precise radial velocity (RV) survey for K giants to search for and study the origin of the lowamplitude and long-periodic RV variations. Methods. We present high-resolution RV measurements of the K2 giant HD 66141 fr
Externí odkaz:
http://arxiv.org/abs/1211.2054
Aims. To search for extrasolar planets around intermediate-mass stars, we are conducting a precise RV survey around K-giants. Methods. We present high-accuracy RV measurements of {\alpha} Ari made from November 2003 to February 2010. This star belong
Externí odkaz:
http://arxiv.org/abs/1104.4431