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The Sirius supercluster in the FK5
Fifty-five stars in the FK5 or with PPM(H) quality proper motions arediscussed as members of the Sirius supercluster. The convergent point ofthe supercluster motion is (A, D) = (20.55h -38.1 deg) and the spacevelocity is V(T) = 18.6 + 0.005X km/s, where X is the radial distance ofthe members from the sun. The member stars indicate (Fe/H) Hyades -(Fe/H) Sirius = 0.18 dex from both photometric and spectroscopicevidence. The bulk of the supercluster members fall into two age groups,6.3 x 10 exp 8 and 10 exp 9 yr on the basis of models with convectiveovershoot. The available observations of chromospheric activity in Mg II(h and k) are quantized into three well-defined groups for both Siriussupercluster and Hyades cluster dwarfs. For 20 supercluster members withcluster parallax greater than 0.03 arcsec the ratio ofpi(cluster)/pi(trigonometric) = 0.95 +/- 0.20(sigma).
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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Idra |
| Ascensione retta: | 08h36m39.56s |
| Declinazione: | -09°42'51.2" |
| Magnitudine apparente: | 7.483 |
| Distanza: | 310.559 parsec |
| Moto proprio RA: | -6.1 |
| Moto proprio Dec: | -4.5 |
| B-T magnitude: | 8.943 |
| V-T magnitude: | 7.604 |
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