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Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.
| First radial velocities for 146 bright F- and G-type stars
We have obtained an average of 5.7 radial velocities for 146 northernstars of types F and G (all luminosity classes) listed in 'A Supplementto the Bright Star Catalogue' as having no previously known radialvelocity measures. Those were obtained with charge coupled devices(CCDs) and a cross-correlation technique; the intrinsic velocityaccuracy, based on stars of apparently constant velocity, is probablyless than +/- 0.3 km/s per mean. Of those stars 14% are newly discoveredSB2 stars. The prevelance of rapid profile variations (in minutes orhours) in most of the broad-lined F-type stars makes it difficult toobtain accurate measures for them.
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Observation and Astrometry data
| Constellation: | Δίδυμοι |
| Right ascension: | 07h37m40.16s |
| Declination: | +22°20'24.2" |
| Apparent magnitude: | 6.97 |
| Distance: | 148.148 parsecs |
| Proper motion RA: | -2.8 |
| Proper motion Dec: | -41.7 |
| B-T magnitude: | 8.332 |
| V-T magnitude: | 7.083 |
Catalogs and designations:
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