Article (Scientific journals)
The α CrB binary system: A new radial velocity curve, apsidal motion, and the alignment of rotation and orbit axes
Schmitt, J. H. M. M.; Schröder, K.-P.; Rauw, Gregor et al.
2016In Astronomy and Astrophysics, 586, p. 13
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Keywords :
binaries: general; binaries: spectroscopic; techniques: radial velocities
Abstract :
[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.
Research center :
LiSRI - Liège Space Research Institute - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Schmitt, J. H. M. M.;  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)
Language :
English
Title :
The α CrB binary system: A new radial velocity curve, apsidal motion, and the alignment of rotation and orbit axes
Publication date :
01 February 2016
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
586
Pages :
13
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 February 2016

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