Reference : The α CrB binary system: A new radial velocity curve, apsidal motion, and the alignme...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/193080
The α CrB binary system: A new radial velocity curve, apsidal motion, and the alignment of rotation and orbit axes
English
Schmitt, J. H. M. M. mailto [Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
Schröder, K.-P. [Universidad de Guanajuato, Departamento de Astronomía, 36000, Guanajuato, Mexico; Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
Rauw, Gregor [Université de Liège - ULiège > > >]
Hempelmann, A. [Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
Mittag, M. [Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
González-Pérez, J. N. [Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
Czesla, S. [Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
Wolter, U. [Hamburger Sternwarte, Universität Hamburg, 21029, Hambourg, Germany]
Jack, D. [Universidad de Guanajuato, Departamento de Astronomía, 36000, Guanajuato, Mexico)]
1-Feb-2016
Astronomy and Astrophysics
586
13
Yes
International
[en] binaries: general ; binaries: spectroscopic ; techniques: radial velocities
[en] We present a new radial velocity curve for the two components of the eclipsing spectroscopic binary α CrB. This binary consists of two main-sequence stars of types A and G in a 17.3599-day orbit, according to the data from our robotic TIGRE facility that is located in Guanajuato, Mexico. We used a high-resolution solar spectrum to determine the radial velocities of the weak secondary component by cross-correlation and wavelength referencing with telluric lines for the strongly rotationally broadened primary lines (v sin(i) = 138 km s[SUP]-1[/SUP]) to obtain radial velocities with an accuracy of a few hundred m/s. We combined our new RV data with older measurements, dating back to 1908 in the case of the primary, to search for evidence of apsidal motion. We find an apsidal motion period between 6600 and 10 600 yr. This value is consistent with the available data for both the primary and secondary and is also consistent with the assumption that the system has aligned orbit and rotation axes.
Liège Space Research Institute - LiSRI
Researchers ; Students
http://hdl.handle.net/2268/193080
10.1051/0004-6361/201526662
http://adsabs.harvard.edu/abs/2016A%26A...586A.104S

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