2016A&A...586A.104S


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET16:25:42

2016A&A...586A.104S - Astronomy and Astrophysics, volume 586A, 104-104 (2016/2-1)

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., SCHROEDER K.-P., RAUW G., HEMPELMANN A., MITTAG M., GONZALEZ-PEREZ J.N., CZESLA S., WOLTER U. and JACK D.

Abstract (from CDS):

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 (vsin(i)=138km/s) 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 10600yr. 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.

Abstract Copyright:

Journal keyword(s): binaries: general - binaries: spectroscopic - techniques: radial velocities

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2603 0
2 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 373 2
3 * alf CrB Al* 15 34 41.26800 +26 42 52.8940 2.19 2.22 2.24 2.21 2.25 A1IV 454 0
4 V* DI Her Al* 18 53 26.2400114975 +24 16 40.792385926   8.46 8.47     B5III 234 0

    Equat.    Gal    SGal    Ecl

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2020.01.20-16:25:42

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