Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1810e&link_type=abstract
The Astronomical Journal, Volume 116, Issue 4, pp. 1810-1815.
Astronomy and Astrophysics
Astronomy
9
Astrometry, Galaxy: Open Clusters And Associations: Individual: Name: Pleiades, Galaxy: Open Clusters And Associations: Individual: Name: Alpha Persei
Scientific paper
The upper-main-sequence members of the Pleiades and alpha Persei clusters, considered as members of the Local Association, yield mean parallaxes that are only 4% larger than the mean values from Hipparcos observations. The (log T_eff, M_V) diagram reveals that in the temperature range from 6000 to 8000 K, the Hyades and alpha Persei main-sequence members are nearly identical and several tenths of a magnitude brighter than similar stars on the Pleiades main sequence. The departure of the Pleiades main sequence cannot be traced to either age or heavy-element abundance differences in the range thought to apply to these clusters. A 50% increase in the helium abundance of Pleiades over Hyades stars could account for the luminosity difference. Alternative explanations are that the Pleiades cluster is rejected from supercluster membership and/or that the Hipparcos parallax results for the Pleiades are in error by some 10%.
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