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TYC 917-426-1


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Radial Velocity Studies of Close Binary Stars. XIV
Radial velocity (RV) measurements and sine curve fits to the orbital RVvariations are presented for 10 close binary systems: TZ Boo, VW Boo, ELBoo, VZ CVn, GK Cep, RW Com, V2610 Oph, V1387 Ori, AU Ser, and FT UMa.Our spectroscopy revealed two quadruple systems, TZ Boo and V2610 Oph,while three stars showing small photometric amplitudes, EL Boo, V1387Ori, and FT UMa, were found to be triple systems. GK Cep is a closebinary with a faint third component. While most of the studied eclipsingsystems are contact binaries, VZ CVn and GK Cep are detached orsemidetached double-lined binaries, and EL Boo, V1387 Ori, and FT UMaare close binaries of uncertain binary type. The large fraction oftriple and quadruple systems found in this sample supports thehypothesis of formation of close binaries in multiple stellar systems;it also demonstrates that low photometric amplitude binaries are afertile ground for further discoveries of multiple systems.Based on the data obtained at the David Dunlap Observatory, Universityof Toronto, Canada.

Hartha 2009 - ein kurzer bericht.
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Beobachtungen zu den sternen EL Boo, EX Cep und LP UMa.
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B.R.N.O. Times of minima
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Photoelectric Minima of Selected Eclipsing Binaries and Maxima of Pulsating Stars
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Photoelectric Minima of Some Eclipsing Binary Stars
We present 119 minima times of 47 eclipsing binaries.

The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.

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Observation and Astrometry data

Constellation:Bootes
Right ascension:14h48m03.40s
Declination:+13°56'41.2"
Apparent magnitude:9.377
Proper motion RA:-26.9
Proper motion Dec:8.3
B-T magnitude:9.949
V-T magnitude:9.425

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 917-426-1
USNO-A2.0USNO-A2 0975-07598426
HIPHIP 72391

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