Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..669w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 669-675. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astrophysics
13
A Stars, B Stars, H Gamma Line, Spectral Line Width, Stellar Magnitude, Supergiant Stars, Absorption Spectra, Emission Spectra, Main Sequence Stars, Space Observations (From Earth), Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
Emission spectra have been obtained for 31 B0-A5 supergiant stars in the direction of h and Chi Persei, using a Reticon detector attached to the Cassegrain spectrograph of the DAO 1.88-m telescope. After correction for a well defined linear dependence of V(0)/W(H-gamma) on temperature and ionization, a close correlation was established between the equivalent widths of H-gamma and V(0). A tentative absolute magnitude calibration is offered on the basis of the V(0) values of Wildey (1964), and a distance modulus of 11.8. The probable error in Mv from a single supergiant spectrum is found to be about 0.18 mag. Average values of Mv for luminosity class Ia stars were found to agree with the calibration of Schmidt and Kaler (1982). It is shown that the temperature dependence of the Si II/He I abundance ratio is not as useful as spectral type in defining the temperature dependence of V(0)/W(H-gamma) over the full range of stars from B0 to A5. Samples of the Reticon spectra showing the 4200-4500 A region are provided.
Millward C. G.
Walker Gordon A. H.
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