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- W2014504572 abstract "view Abstract Citations (29) References (34) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectrophotometry of peculiar B and A stars. III. 21 Persei, 56 Arietis, and 49 Cancri. Adelman, S. J. ; Pyper, D. M. Abstract Spectrophotometric measurements of three magnetic Ap stars: 21 Per, 56 Ari, and 49 Cnc, are presented for XX3300-7850. For 56 Ari, the X4200 and 5200 broad, continuum features are definitely variable. The 5200 feature strength appears to vary in phase with the u - b index with the feature being strongest when the star is bluest and when the Si ii line strength is a minimum. The energy distribution of this star can be crudely fit by the predictions of a solar composition model atmosphere except for the longward part of the Paschen continuum. The 4200 and 5200 features of both 21 Per and 49 Cnc may be variable. The energy distributions of these stars do not fit the predictions of solar composition models over the range of effective temperatures and gravities expected from the u - b and b -y colors. These two stars are interpreted as cases of line blocking and flux redistribution from the ultraviolet with 21 Per being the more extreme example. One of the regions of enhanced iron peak and rare earth line strength is found to have a smaller Balmer jump than the background photosphere in 21 Per. This is seen as a brightening of the optical ultraviolet and dimming of the shortest observed part of the Paschen continuum relative to the 5000 value when the spot region approaches the sub-Earth point. The 6300 broad, continuum feature may be present in and variable for 49 Cnc. Publication: The Astronomical Journal Pub Date: November 1979 DOI: 10.1086/112601 Bibcode: 1979AJ.....84.1726A Keywords: A Stars; B Stars; Magnetic Stars; Main Sequence Stars; Stellar Spectrophotometry; Atmospheric Models; Continuous Spectra; Paschen Series; Photosphere; Spectral Energy Distribution; Astronomy; Ap Stars:Spectrophotometry full text sources ADS | data products SIMBAD (42) Related Materials (17) Part 1: 1979AJ.....84..857A Part 2: 1979AJ.....84.1603A Part 4: 1980AJ.....85..836W Part 5: 1980A&A....86..149A Part 6: 1980A&AS...42..289A Part 7: 1980A&AS...42..375A Part 8: 1981A&AS...43...25A Part 9: 1981A&AS...43..183A Part 10: 1981A&AS...44..265A Part 11: 1981A&AS...44..309A Part 12: 1982A&AS...49..663A Part 13: 1983A&AS...51..365P Part 14: 1983A&AS...51..511A Part 15: 1983A&A...118..313A Part 16: 1984A&AS...55..479A Part 17: 1985A&AS...59..369P Part 18: 1985A&AS...62..279A" @default.
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- W2014504572 date "1979-11-01" @default.
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- W2014504572 title "Spectrophotometry of peculiar B and A stars. III - 21 Persei, 56 Arietis, and 49 CANCRI" @default.
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