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HD 37029


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Spectroscopic binaries in the Orion OB1 association
A radial velocity study of the brighter members of the Ori OB2association is reported. The radial velocity variables, new preliminaryorbital elements for six spectroscopic binaries, and the projected axialrotation in stars for which the orbital elements are lacking arereported. The correlation between the proportion of binaries and theaverage axial rotation for the subgroups of the association isdiscussed. It is found that the Orion main-sequence members rotate atalmost the same rate as field stars of the same types. The averageradial velocity for the whole association is 23 km/s. The percentage ofspectroscopic binaries with periods shorter than 100 days plus themagnetic Ap-Bp among the main-sequence members of the association is 32percent.

Ultraviolet photometry from the Orbiting Astronomical Observatory. XX - The ultraviolet extinction bump
Ultraviolet extinction bumps are investigated in the interstellarextinction curves between 1800 and 3600 A for 36 stars which have (B-V)excesses ranging from 0.03 to 0.55 and are mostly confined to thebrighter OB associations distributed along the galactic plane. Eachextinction curve is found to have a broad bump which peaks near 2175 Aand whose position and profile appear to be constant among all thestars. It is shown that the bump is probably interstellar in origin andthat the constancy of its position and shape places such severerestrictions on grain geometrical parameters that classical scatteringtheory cannot be used to explain the feature unless the dust grains inwidely separated regions of space and with very different physicalconditions are assumed to have nearly identical size and shapedistributions. Three extinction curves which extend to 1100 A areexamined and found to have the same general characteristics as theothers. Several extinction curves are analyzed for fine structure, butno convincing evidence is found in the present interval. Some processesare discussed which may be responsible for the bumps.

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Observation and Astrometry data

Constellation:Giraffe
Right ascension:05h40m00.07s
Declination:+63°13'45.0"
Apparent magnitude:8.516
Distance:854.701 parsecs
Proper motion RA:-0.8
Proper motion Dec:-5.2
B-T magnitude:10.613
V-T magnitude:8.69

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 37029
TYCHO-2 2000TYC 4085-392-1
USNO-A2.0USNO-A2 1500-04303578
HIPHIP 26663

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