The distance and main sequence of the Hyades cluster based on 145 stars with highly accurate proper motions obtained from work on the catalogues FK 5 and PPM

Details The distance and main sequence of the Hyades cluster based on 145 stars with highly accurate proper motions obtained from work on the catalogues FK 5 and PPM The distance and main sequence of the Hyades cluster based on 145 stars with highly accurate proper motions obtained from work on the catalogues FK 5 and PPM

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..386s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 386-400.

Astronomy and Astrophysics

Astrophysics

92

Astronomical Catalogs, Main Sequence Stars, Open Clusters, Stellar Motions, Astronomical Photometry, Radial Velocity, Stellar Color, Stellar Magnitude, Subdwarf Stars, Open Clusters, Hyades Distance, Hyades Main Sequence, Cm Diagram

Scientific paper

Distances for 145 Hyades members in an extended region of the Hyades cluster were derived on the basis of new, highly accurate proper motions obtained from work on the catalogues FK 5 and PPM. The cluster membership of the stars has been discussed and a few new candidates are proposed. From a selected subset of our sample we have obtained the convergence point α = 6h30m.7±1m.7 = 97°41'±25', δ = 5°59'±11'. Combining this point with the mean cluster radial velocity of 39.1 km s-1 by Detweiler et al. (1984) one finds the galactic space velocity (U, V, W) = (-42.02, -20.12, -1.04) km s-1. The galactic coordinates of the centre of our sample are (X, Y, Z) = (-44.3, +0.5, - 18.2)pc. The distance of this centre from the Sun is 47.9±0.8 pc corresponding to a modulus m - M = 3m.40±0m.04. Individual distance moduli, coordinates and velocity residuals per star are given. The Hyades main sequence has been constructed in the range B - V < 1m.2 and it is presented analytically as well as by tabular values. The dispersion σ(Mυ) = 0m.14of the absolute magnitudes about the main sequence indicates its high internal accuracy.

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