Photoelectric H-alpha line photometry of early-type stars

Details Photoelectric H-alpha line photometry of early-type stars Photoelectric H-alpha line photometry of early-type stars

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26as...30....1c&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 30, Oct. 1977, p. 1-10. Research supported by the Consiglio Nazionale delle

Astronomy and Astrophysics

Astrophysics

11

Early Stars, Electrophotometry, H Alpha Line, Stellar Spectrophotometry, A Stars, B Stars, Balmer Series, Dwarf Stars, Giant Stars, Least Squares Method, O Stars, Spectral Energy Distribution, Spectral Line Width, Stellar Luminosity, Ubv Spectra

Scientific paper

A total of 293 bright stars of spectral types O, B, A, F and of luminosity classes I through V have been measured with a photoelectric photometer equipped with two interference filters of 30-A bandwidth, one centered on H-alpha and the other at 6622 A. A correction term has been allowed for the response of the photometric system and for the continuum energy distribution in the two spectral regions considered. The resulting photometric alpha indices of H-alpha line strength are compared with previous H-alpha, H-beta, and H-gamma photometric measures, H-alpha equivalent widths, the MK spectral type, /u-b/, /c1/, and b-y indices of the uvby photometric system. The results emphasize the advantage of using H-alpha line photometry to discriminate between emission-line effects and luminosity effects in early-type stars and to detect emission-line variability.

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