Abstract
view Abstract Citations (1) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopic Absolute Magnitudes of Early-Type Stars from Hydrogen Absorption-a Revision. Petrie, R. M. Abstract Equivalent widths of H~ in spectra of 166 early- type stars are used for a new derivation of the calibration of absolute magnitude. Calibrating stars are members of the galactic clusters the Pleiades, the a Persei cluster, and NGC 2244; the associations I Orionis and h and X Persei; and six visual binary systems. Spectral types included are O6 to A3; the range in absolute magnitude is from 7.3 to +2.3. Cluster sequences are used to determine the shape of the curve and spectral-type corrections. The zero point is fixed from nearby A stars, from visual binaries, and from eclipsing binaries. The new calibration is given in graphical and tabular forms. Distance moduli of three clusters and five associations determined from the calibration agree closely with those given by the photometric distance scale. Absolute magnitudes with the new calibration average about 0.7 mag. brighter than the original calibration, and are on the average 0.2 mag. fainter than the revised calibration of MK classes for B stars. Publication: The Astronomical Journal Pub Date: 1964 DOI: 10.1086/109460 Bibcode: 1964AJ.....69R.555P full text sources ADS |
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