Statistical Constraints for Astrometric Binaries with Nonlinear Motion

Details Statistical Constraints for Astrometric Binaries with Nonlinear Motion Statistical Constraints for Astrometric Binaries with Nonlinear Motion

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aj....129.2420m&link_type=abstract

The Astronomical Journal, Volume 129, Issue 5, pp. 2420-2427.

Astronomy and Astrophysics

Astronomy

48

Astrometry, Stars: Binaries: General

Scientific paper

Useful constraints on the orbits and mass ratios of astrometric binaries in the Hipparcos catalog are derived from the measured proper motion differences of Hipparcos and Tycho-2 (Δμ), accelerations of proper motions (μ˙), and second derivatives of proper motions (μ̈). It is shown how, in some cases, statistical bounds can be estimated for the masses of the secondary components. Two catalogs of astrometric binaries are generated, one of binaries with significant proper motion differences and the other of binaries with significant accelerations of their proper motions. Mathematical relations between the astrometric observables Δμ, μ˙, and μ̈ and the orbital elements are derived in the appendices. We find a remarkable difference between the distribution of spectral types of stars with large accelerations but small proper motion differences and that of stars with large proper motion differences but insignificant accelerations. The spectral type distribution for the former sample of binaries is the same as the general distribution of all stars in the Hipparcos catalog, whereas the latter sample is clearly dominated by solar-type stars, with an obvious dearth of blue stars. We point out that the latter set includes mostly binaries with long periods (longer than about 6 yr).

Affiliated with

Also associated with

No associations

Rating

Statistical Constraints for Astrometric Binaries with Nonlinear Motion 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 Statistical Constraints for Astrometric Binaries with Nonlinear Motion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Statistical Constraints for Astrometric Binaries with Nonlinear Motion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1700932