J/A+A/531/A89 Spectroscopic orbit of Capella (Weber+, 2011)
The spectroscopic orbit of Capella revisited.
Weber M., Strassmeier K.G.
<Astron. Astrophys. 531, A89 (2011)>
=2011A&A...531A..89W 2011A&A...531A..89W
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: stars: individual: Capella (alpha Aur) - starspots -
techniques: radial velocities - binaries: spectroscopic -
stars: late-type
Abstract:
Capella is among the few binary stars with two evolved giant
components. The hotter component is a chromospherically active
star within the Hertzsprung gap, while the cooler star is possibly
helium-core burning.
The known inclination of the orbital plane from astrometry in
combination with precise radial velocities will allow very accurate
masses to be determined for the individual Capella stars. This will
constrain their evolutionary stage and possibly the role of the active
star's magnetic field on the dynamical evolution of the binary system.
We obtained a total of 438 high-resolution echelle spectra during the
years 2007-2010 and used the measured velocities to recompute the
orbital elements. Our double-lined orbital solution yields average
residuals of 64m/s for the cool component and 297m/s for the more
rapidly rotating hotter component.
Description:
Barycentric STELLA radial velocities of Capella.
Objects:
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RA (2000) DE Designation(s)
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05 16 41.4 +45 59 53 Capella = HR 1708
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 37 438 Barycentric STELLA radial velocities of Capella
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian Date
13- 18 F6.3 km/s RVA Barycentric radial velocity of component A
20- 24 F5.3 km/s e_RVA Internal measurement error of component A
26- 31 F6.3 km/s RVB Barycentric radial velocity of component B
33- 37 F5.3 km/s e_RVB Internal measurement error of component B
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Acknowledgements:
Michael Weber, mweber(at)aip.de
(End) Michael Weber [AIP, Germany], Patricia Vannier [CDS] 06-May-2011