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Photoelectric measures of Hydrogen-line absorption in early-type stars

Show simple item record Bappu, M. K. Vainu Chandra, S. Sanwal, N. B. Sinvhal, S. D. 2015-08-17T06:01:51Z 2015-08-17T06:01:51Z 1962
dc.description.abstract Photoelectric determinations of H 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 45 A were used to isolate spectral regions centred on 4z80 A, H and 4410 A. The F indices derived, which represent a measure of the Hy absorption, can be used in conjunction with unreddened values of either (U-B) or (B - V) for spectral and luininosity class determinations of stars in the spectral range O6 to Ao. The separation of age loci is shown to exist on F, (U-B)0 diagrams of clusters and associations having different ages. A F, Mv calibration for the young, or less evolved stars, has been derived. Tests of such a calibration have been made on the Orion Association and NGC z362. The distance moduli thus obtained are in good agreement with the values derived from the colour magnitude arrays. en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries mnras123-521
dc.subject Photoelectric en_US
dc.title Photoelectric measures of Hydrogen-line absorption in early-type stars en_US
dc.type Article en_US

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