Abstract
view Abstract Citations (35) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Sirius Supercluster in FK5 Eggen, Olin J. Abstract Fifty-five stars in the FK5 or with PPM(H) quality proper motions are discussed as members of the Sirius supercluster. The convergent point of the supercluster motion is (A, D) = (20.55h -38.1 deg) and the space velocity is V(T) = 18.6 + 0.005X km/s, where X is the radial distance of the members from the sun. The member stars indicate (Fe/H) Hyades - (Fe/H) Sirius = 0.18 dex from both photometric and spectroscopic evidence. 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 convective overshoot. The available observations of chromospheric activity in Mg II (h and k) are quantized into three well-defined groups for both Sirius supercluster and Hyades cluster dwarfs. For 20 supercluster members with cluster parallax greater than 0.03 arcsec the ratio of pi(cluster)/pi(trigonometric) = 0.95 +/- 0.20(sigma). Publication: The Astronomical Journal Pub Date: October 1992 DOI: 10.1086/116334 Bibcode: 1992AJ....104.1493E Keywords: Chronology; Star Clusters; Stellar Motions; Stellar Spectrophotometry; A Stars; Binary Stars; Chromosphere; Dwarf Stars; Radial Velocity; Astrophysics; GALAXIES: STAR CLUSTERS full text sources ADS | data products SIMBAD (97)
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