HD 48979

Photoelectric filter photometry of the flux depression at 5200 A in Ap-stars A new photometric index was used to characterize the flux depression at5200 A in a photoelectric filter photometric study of a large number ofnormal A-stars, Ap-stars, Am-stars, and Hg-Mn-stars. The new index isdefined as a = g - (h + y)/2, where g and h are the brightnesses at 5240and 5020 A, respectively, measured by interference filters, and y is thebrightness measured with a Stromgren filter. The index reveals a markedcontrast between normal and peculiar stars.
On the variability of the peculiar A type star HD 49976. Abstract image available at:http://adsabs.harvard.edu/abs/1975A&A....44..405M
Spectroscopic observations of stars in HII regions. Not Available
Radial velocities of southern B stars determined at the Radcliffe observatory 6. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972MNRAS.158...85C&db_key=AST
Observations of stars in HII regions : spectral classification and UBVphotometry. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971AJ.....76..260C&db_key=AST
A Catalogue of H II Regions. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1959ApJS....4..257S&db_key=AST
Symmetric Galactic Nebulae. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955ApJ...121..604J&db_key=AST

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