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HD 70491


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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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Statistics of spectroscopic sub-systems in visual multiple stars
A large sample of visual multiples of spectral types F5-M has beensurveyed for the presence of spectroscopic sub-systems. Some 4200 radialvelocities of 574 components were measured in 1994-2000 with thecorrelation radial velocity meter. A total of 46 new spectroscopicorbits were computed for this sample. Physical relations are establishedfor most of the visual systems and several optical components areidentified as well. The period distribution of sub-systems has a maximumat periods from 2 to 7 days, likely explained by a combination of tidaldissipation with triple-star dynamics. The fraction of spectroscopicsub-systems among the dwarf components of close visual binaries withknown orbits is similar to that of field dwarfs, from 11% to 18% percomponent. Sub-systems are more frequent among the components of widevisual binaries and among wide tertiary components to the known visualor spectroscopic binaries - 20% and 30%, respectively. In triple systemswith both outer (visual) and inner (spectroscopic) orbits known, we findan anti-correlation between the periods of inner sub-systems and theeccentricities of outer orbits which must be related to dynamicalstability constraints. Tables 1, 2, and 6 are only available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/382/118

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Observation and Astrometry data

Constellation:Lynx
Right ascension:08h24m08.59s
Declination:+44°44'31.8"
Apparent magnitude:8.547
Distance:10000000 parsecs
Proper motion RA:-19.4
Proper motion Dec:-15.6
B-T magnitude:9.62
V-T magnitude:8.636

Catalogs and designations:
Proper Names
HD 1989HD 70491
TYCHO-2 2000TYC 2980-2163-1
USNO-A2.0USNO-A2 1275-07261447
HIPHIP 41176

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