A Study of the Spectrum Variables of Type a.

view Abstract Citations (103) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Study of the Spectrum Variables of Type a. Deutsch, Armin J. Abstract The periods of variation have been found for the five spectrum variables BD- 18 °3789, BD+33 °1008, Boo(A), x Ser, and `y An(S); the last three named have been newly discovered. Other new spectrum variables described are 78 Vir, 56 An, and 45 Her. Reproductions of spectrograms are given which illus- trate the variation. The companions of the spectrum variables ir Boo(A) and 17 Com(A) have been found to be metallic-line stars. A catalogue of spectrum variables has been compiled, which gives the gross spec- troscopic characteristics of all such stars now known. The phase relations among lines originating from different elements have been discussed and found to differ from star to star. The luminosities and colors of the AOp stars correspond approximately to type B8. In general, the peculiar A stars appear to be ap- preciably bluer than normal stars of equivalent spectral type and to lie about 1 mag. above the main sequence. I. INTRODTJCTIO Publication: The Astrophysical Journal Pub Date: March 1947 DOI: 10.1086/144904 Bibcode: 1947ApJ...105..283D full text sources ADS | data products SIMBAD (18)