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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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Coban |
| Sað Açýklýk: | 14h16m33.93s |
| Yükselim: | +32°12'30.4" |
| Görünürdeki Parlaklýk: | 6.73 |
| Uzaklýk: | 139.47 parsek |
| özdevim Sað Açýklýk: | 18.7 |
| özdevim Yükselim: | 6.4 |
| B-T magnitude: | 7.914 |
| V-T magnitude: | 6.828 |
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