The Kinematics of Main Sequence Stars from HIPPARCOS Data

Details The Kinematics of Main Sequence Stars from HIPPARCOS Data The Kinematics of Main Sequence Stars from HIPPARCOS Data

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..473b&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 473-478

Computer Science

27

Scientific paper

We analyze a kinematically unbiased sample of 5610 stars around the south celestial pole that (i) have MK spectral types in the Michigan catalogues with luminosity class V and (ii) had photometric parallaxes that placed them within 80 pc of the Sun. We bin the stars by B-V and determine for each bin the solar motion from proper motions alone. As expected, the U and W components of the derived solar motions do not vary significantly from bin to bin, while the V component varies systematically. As the classic Stroemberg relation predicts, V is a linear function of the variance S^2 within each bin around the solar motion. Extrapolating V(S^2) to S=0 we determine the solar motion with respect to the LSR, obtaining a significantly smaller value of V than is usually employed. Parenago's discontinuity in the dependence of S^2 on spectral type emerges with exceptional clarity.

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