Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations

Details Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations

2009-08-19

arxiv.org/abs/0908.2761v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

A&A, accepted (this version: as sent to language editor)

Scientific paper

Aims. I look for and characterise very wide binaries and multiple systems with projected physical separations larger than s = 0.1 pc, which is generally believed to be a sharp upper limit to the distribution of wide binay semimajor axes. Methods. I investigated in detail 30 Washington Double Stars with angular separations rho > 1000 arcsec. I discarded 23 of them as probably unbound systems based on discordant astrometry, photometry, spectral types, and radial velocities. The remaining seven systems were subject to a comprehensive data compilation and derivation (multi-wavelength photometry, heliocentric distance, multiplicity, age, mass, metallicity, membership in young kinematic group). Results. Of the seven very wide systems, six have projected physical separations larger than the hypothetical cutoff at s = 0.1 pc; four of them have separations s > 0.2 pc. Although there are two systems in young kinematic groups (namely HD 136654 and BD+32 2572 in the Hyades Supercluster, and AU Mic and AT Mic AB in the beta Pictoris moving group), there is not a clear prevalence of young systems (tau < 1 Ga) among these very wide binaries. Finally, I compare the binding energies of the seven systems with those of other weakly bound systems in the field.

Affiliated with

Also associated with

No associations

Rating

Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-216461