J/A+A/409/245 ADS 11061 radial velocities (Tokovinin+, 2003)
Fundamental parameters and origin of the very eccentric binary 41 Dra
Tokovinin A., Balega Y.Y., Pluzhnik E.A., Shatsky N.I., Gorynya N.A.,
Weigelt G.
<Astron. Astrophys. 409, 245 (2003)>
=2003A&A...409..245T 2003A&A...409..245T
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: stars: binaries: visual - stars: binaries: spectroscopic -
stars: formation - stars: individual: HD 166866, HD 166865
Abstract:
The evolutionary status and origin of the most eccentric known binary
in a quadruple system, 41 Dra (e=0.9754, period 3.413yr), are
discussed. New observations include the much improved combined
speckle-interferometric orbit, resolved photometry of the components
and their spectroscopic analysis. The age of the system is
2.5±0.2Gyr; all four components are likely coeval. The high
eccentricity of the orbit together with known age and masses provide a
constraint on the tidal circularization theory: it seems that the
eccentric orbit survived because the convective zones of the F-type
dwarfs were very thin. Now as the components of 41 Dra are leaving the
Main Sequence, their increased interaction at each periastron passage
may result in detectable changes in period and eccentricity.
Description:
Individual radial velocities (heliocentric date, velocity, error),
interferometric observations and residuals to orbits are given for the
components of ADS 11061 (HD 166866 and HD 166865)
Objects:
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RA (2000) DE Designation(s)
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18 00 04 +80 00.1 40 Dra = HD 166865
18 00 09 +80 00.2 41 Dra = HD 166866
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 44 141 Radial velocities of 41 Dra
table2.dat 45 18 Radial velocities of 40 Dra
table3.dat 54 19 Speckle-interferometry of 41 Dra
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JDH Heliocentric Julian Date
13- 19 F7.2 km/s RV Radial velocity
22- 27 F6.2 km/s e_RV Formal error of radial velocity
30- 35 F6.2 km/s O-C Residual to the orbit
37- 39 A3 --- Comp [a+b ] Component (a-primary, b-secondary)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JDH Heliocentric Julian Date
15- 19 F5.1 deg PA Position angle, degrees
22- 27 F6.3 arcsec Rho Separation, arcseconds
32- 35 F4.1 deg (O-C)PA (O-C) in position angle, degrees
38- 43 F6.3 arcsec (O-C)Rho (O-C) in separation, arcseconds
45- 51 A7 --- CMT Author of data
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Acknowledgements: Andrei Tokovinin
(End) Patricia Bauer [CDS] 08-Jul-2003