Other
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208...83s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 1, 1984, p. 83-89.
Other
6
A Stars, Angular Velocity, Calibrating, Galactic Clusters, Stellar Rotation, Stellar Spectrophotometry, Astrometry, Main Sequence Stars, Mass To Light Ratios, Spectral Bands, Stellar Magnitude
Scientific paper
In a previous study of IC 4756 with intermediate band photometry, it was found that the A stars above the turn-off point did not seem to obey a prevously derived absolute magnitude calibration. Since such an effect in other clusters has been attributed to rotation, rotational velocities for 26 stars in IC 4756 have been measured and photometric observations of stars which are fainter and nearer to zero-age main sequence have been obtained. The rotational velocities show no relation to departures from the calibration. Thus, it is concluded that the calibration does not apply to this cluster but stellar rotation is not the cause. A new true distance modulus of V(c) - M(v) = 6.8 is derived by extrapolating the observed photometric indices to the zero-age sequence. However, it is considered uncertain due to the difficulties with the calibration.
Forbes Duncan
Schmidt Edward G.
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