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II/40 Hydrogen-Line Absorption in Early-Type Stars (Bappu+ 1962)
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Beginning of ReadMe :II/40 Hydrogen-Line Absorption in Early-Type Stars (Bappu+ 1962)
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Photoelectric Measures of Hydrogen-Line Absorption in Early-Type Stars
Bappu M.K.V., Chandra S., Sanwal N.B., Sinvhal S.D.
<Mon. Not. R. Astron. Soc., 123, 521 (1962)>
=1962MNRAS.123..521B
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ADC_Keywords: Photometry, hydrogen-line; Stars, early-type
Abstract:
Photoelectric determinations of H-gamma absorption line intensity
have been made of stars in selected clusters and associations as well
as in the general galactic field. Interference filters having a width
at half intensity of 45AA were used to isolate spectral regions
centered on 4280AA, H-gamma and 4410AA. The Gamma indices
derived, which represent a measure of H-gamma absorption, can be
used in conjunction with unreddened values of either (U-B) or (B-V)
for spectral and luminosity class determinations of stars in the
spectral range O6 to A0.