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HD 15598


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The Hyades main sequence
Intermediate band, H-beta and RI observations of 72 Hyades cluster starsto V = 11 mag are reported and discussed. A modulus of 3.2 mag isderived on the basis of a comparison with field stars of large parallax.Also presented are observations of 98 main-sequence stars of the Hyadesgroup that were previously found to be group members from kinematicalconsiderations. Parallaxes of the group stars, computed on theassumption that they are members of an extended Hyades cluster, yieldmean values of (U, V, W) = (+40.5, -18.4, -4.9) km/s, with dispersionsof (2.3, 2.3, 6.0) km/s, compared with (+41.7, -18.4, -2.0) and (2.6,1.3, 1.9) km/s for the brightest cluster members. It is noted that allthe stars discussed can be considered as members of a supercluster inwhich only a slight relaxation control of the W velocities is presentfor stars far from the nucleus. Evidence is found, including that of thePraesepe cluster at Z = +80 pc, for some interchange between the U, V,and W velocities in stars farthest from the galactic plane, with thetotal cluster velocity being maintained.

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Observation and Astrometry data

Constellation:Cetus
Right ascension:02h30m26.46s
Declination:-05°01'51.9"
Apparent magnitude:7.662
Distance:119.904 parsecs
Proper motion RA:-10.6
Proper motion Dec:-11.1
B-T magnitude:7.748
V-T magnitude:7.67

Catalogs and designations:
Proper Names
HD 1989HD 15598
TYCHO-2 2000TYC 4704-862-1
USNO-A2.0USNO-A2 0825-00584417
HIPHIP 11664

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