Abstract
view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Mass Motions in the Atmosphere of Rho Cassiopeiae. Sargent, Wallace L. W. Abstract A study has been made of several 4.5 A/mm and 10 A/mm coude' plates of p Cas, obtained at Palomar between 1955 and 1960. The phenomenon of line doubling reported by W. P. Bidelman and A. McKellar (1957, Publs. Astron. Soc. Pacific 69, 31) has persisted. An examination of about 150 doubled lines between A4000 and A6800 shows that they all arise from lower levels with excitation potentials less than about 2.5 v. From 1955 to 1958 the position and appearance of the short- ward components, attributed to an expanding shell surrounding the star, were unchanged. In 1959 the velocity of the shell relative to the star increased from 38 km/sec to 43 km/sec, while the "shell" components of the doubled lines became weaker and sharper. The Cai x6573 emission and Ha emission observed by Bidelman and McKellar (1957) have continued. In addition the intercombination lines of Fei, multiplets 12, 13, and 14, have been observed in emission in the red and infared. Estimates of the mass and radius of the shell have been obtained from photometry of the emission lines and the shell components of the double absorption lines. The radius of the shell is less than 4000 R0 (about 10 times that the star) and a minimum value of the mass is 1026 g. Large-scale and small-scale turbulent velocities v6 and v8 in the shell and the photosphere have been obtained using both the curve of growth and the method of S. S. Huang and 0. Struve (1955, Astrophys. J. 121, 84). The turbulent velocity v~~ in the shell is 8 km/sec, while in the photosphere the values of v8 for Fei range from 10.4 km/sec for zero-volt lines to 6 km/sec for four-volt lines. The values of v6 are higher, about 18 km/sec. Publication: The Astronomical Journal Pub Date: 1960 DOI: 10.1086/108340 Bibcode: 1960AJ.....65S.499S full text sources ADS |
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