scholarly journals Duplicity Among Solar-Type Stars

1992 ◽  
Vol 135 ◽  
pp. 82-88 ◽  
Author(s):  
Helmut A. Abt ◽  
Daryl W. Willmarth
Keyword(s):  
Open Clusters ◽  
Radial Velocities ◽  
Apparent Magnitude ◽  
Limited Sample ◽  
Visual Systems ◽  
Binary Formation ◽  
Capture Mechanism ◽  
Solar Type ◽  
Flat Distribution

AbstractFrom a new study of 113 F8-G1 IV or V primaries in an apparent-magnitude limited sample, measured with a CCD for about 20 radial velocities of accuracy 0.2-0.5 km s−1 each, we collected data for 28 binary orbits and 39 visual systems. We again found a flat distribution (or slightly decreasing toward lower masses) of secondary masses, unlike the Salpeter distribution for B2-B5 stars. But we find that the different distributions for these field stars and for open clusters of various ages can all be explained by a capture mechanism of binary formation.

scholarly journals Survey of the Bootes Void

1983 ◽  
Vol 104 ◽  
pp. 197-201
Author(s):  
R. P. Kirshner ◽  
A. Oemler ◽  
P. L. Schechter ◽  
S. A. Shectman
Keyword(s):  
Radial Velocities ◽  
Apparent Magnitude ◽  
Velocity Difference ◽  
Spherical Volume ◽  
Galaxy Distribution ◽  
The Galaxy ◽  
Small Fields ◽  
Close Pairs

Radial velocities have been measured for 231 galaxies chosen by apparent magnitude from 282 small fields spanning the area on the sky thought to contain the Bootes void. The galaxy distribution exhibits a spherical volume 6000 km/s in diameter in which no objects are found. The rms velocity difference of close pairs in our sample is less than 180 km/s.

scholarly journals Spectroscopic Binaries in Southern Open Clusters

2004 ◽  
Vol 191 ◽  
pp. 141-142
Author(s):  
H. Levato ◽  
J.F. González ◽  
S. Malaroda ◽  
M. Grosso
Keyword(s):  
Open Clusters ◽  
Spectroscopic Binaries ◽  
Observational Constraints ◽  
Binary Formation ◽  
Formation And Evolution

AbstractThis is a report on an ongoing program about binaries in southern open clusters. The long-term purpose of this project is to contribute to understanding the formation and evolution of spectroscopic binaries, providing observational constraints that will permit tests of some of the current theories on binary formation in open clusters.

scholarly journals Statistical Properties of an Unbiased Sample of F7-K Binaries: Towards The Long-Period Systems

2004 ◽  
Vol 191 ◽  
pp. 28-32 ◽  
Author(s):  
A. Eggenberger ◽  
J.-L. Halbwachs ◽  
S. Udry ◽  
M. Mayor
Keyword(s):  
Main Sequence ◽  
Equal Mass ◽  
Statistical Properties ◽  
Spectroscopic Binaries ◽  
Mass Ratio ◽  
Long Period ◽  
Period Distribution ◽  
Solar Type ◽  
Flat Distribution ◽  
Visual Binaries

AbstractWe have undertaken a new investigation of the statistical properties of main-sequence binaries, which is a revision and extension of the Duquennoy & Mayor survey of solar-type stars. The analysis has been divided into two parts: the spectroscopic binaries with periods shorter than 10 years, and the long-period systems including visual binaries and common proper motion pairs. In this contribution we present preliminary results regarding the intrinsic mass ratio and period distributions of visual binaries. Our results are strongly limited by small-number statistics, but when combined with the ones found for the spectroscopic binaries, the following results are obtained: (i) the excess of equal-mass binaries, if still present, is less important for long-period systems than for the binaries with P < 50 days; (ii) the period distribution is inconsistent with a flat distribution.

Stellar and molecular radial velocities for six young open clusters

1988 ◽  
Vol 95 ◽  
pp. 1122 ◽  
Author(s):  
Tianxing Liu ◽  
Kenneth A. Janes ◽  
T. M. Bania ◽  
Randy L. Phelps
Keyword(s):  
Open Clusters ◽  
Radial Velocities

scholarly journals A Determination of Secular Parallaxes of Reference Stars from Relative Proper Motions of Open Clusters

1970 ◽  
Vol 7 ◽  
pp. 74-76
Author(s):  
A. N. Deutsch
Keyword(s):  
Systematic Errors ◽  
Open Clusters ◽  
Radial Velocities ◽  
Proper Motions ◽  
The Mean

The determination of secular parallaxes of stars is usually based on meridian observations of proper motions of bright stars, this introducing known systematic errors. The mean parallaxes of stars can be obtained by means of radial velocities which are known for the bright stars. The more perspective method, the reference of stars to galaxies, is not applicable at low galactic latitudes.

scholarly journals Mixing in Magnetized Interiors of Solar-Type Stars: Frequently Asked Questions

2002 ◽  
Vol 12 ◽  
pp. 301-303
Author(s):  
Paul Charbonneau
Keyword(s):  
Angular Momentum ◽  
Turbulent Mixing ◽  
Chemical Species ◽  
Light Element ◽  
Open Clusters ◽  
Short Paper ◽  
Angular Momentum Transport ◽  
Solar Type ◽  
Element Evolution ◽  
Seismic Measurements

AbstractThis short paper discusses various issues pertaining to the redistribution of angular momentum and mixing of chemical species in the radiative interior of solar-type stars. Results obtained to date indicate that models combining magnetically-mediated angular momentum transport with turbulent mixing of chemical species offer the best hope of explaining the observed rotation and light element evolution in open clusters, without doing excess violence to seismic measurements of the solar internal differential rotation.

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