Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..755e&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Aug. 1986, p. 755-761.
Astronomy and Astrophysics
Astronomy
25
Astrometry, Calibrating, Early Stars, Pleiades Cluster, Star Clusters, Stellar Luminosity, A Stars, Distance, Main Sequence Stars, Stellar Evolution, Stellar Spectrophotometry
Scientific paper
An examination of the lower main-sequence (mode-A) stars in the Pleiades cluster suggests an Fe/H abundance ratio between 0.0 and 0.1 dex with a resulting modulus of 5.65 + or - 0.1 mag, and fundamental defects in the calculation of Balona and Shobbrook (1984), with an adopted modulus of 5.50 mag, are discussed. It is suggested that the ZAMS of Balona and Shobbrook, and of Mermilliod (1981), are too bright due to their assumption that the color-luminosity arrays of such clusters as the Pleiades represent isochrones, leading to uncertainties in the ZAMS, particularly with respect to slope. Several recently published photometric luminosity calibrations for early-type stars may be incorrect due to their failing to recognize the probable presence of at least two evolutionary modes and the apparent absence of ZAMS stars near the sun.
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