Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-20T06:39:45.476Z Has data issue: false hasContentIssue false
  • English
  • Français

The Spectral Classification of Southern Carbon Stars

Published online by Cambridge University Press:  14 August 2015

P. M. Rybski
P. M. Rybski*
Affiliation:
Lindheimer Astronomical Research Center, Northwestern University, Evanston, Ill., U.S.A.

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Well-widened objective prism spectra of carbon stars south of −25° declination have been examined to determine their suitability for classification. These spectra, taken by Henize in the early 1950's from South Africa as part of the Michigan-Mt. Wilson Hα survey of the southern sky, have a reciprocal dispersion at Na I 5890 Å of 300 Å mm−1 and are in good focus in the range between 5100 and 6600 Å.

Compared with spectra of northern carbon stars taken by the writer at the Lindheimer Astronomical Research Center with the one meter reflecting telescope and Cassegrain spectrograph at a grating reciprocal dispersion of 263 Å mm-1, and compared with spectra taken by Sanford of carbon stars overlapping the Henize sample, the objective prism spectra have been found of sufficient quality to support their classification into five groups following the scheme as proposed by Keenan and Morgan in 1941 and as refined by Gordon in 1967.

The first group exhibit weak C2 and CN features and Hα in absorption; the second, features attributable to a low C12/C13 ratio; the third, strong C2 and CN features and only moderately strong Na i in absorption; the fourth, very strong Na i in absorption; and the fifth, Hα in emission. Examples are given of each group, stars not fitting well into any of these groups are discussed, and the significance of each group is mentioned in light of work by Bouigue, Gordon, Peery, and Richer.

Type
Part II: Classification of Objective-Prism Spectra
Information
Symposium - International Astronomical Union , Volume 50: Spectral Classification and Multicolour Photometry , 1973 , pp. 96 - 108
Copyright
Copyright © Reidel 1973 

References

Bidelman, W. P.: 1950, Astrophys. J. 112, 219.Google Scholar
Bidelman, W. P.: 1956, Vistas in Astronomy 2, 1428.Google Scholar
Bidelman, W. P. and Keenan, P. C.: 1951, Astrophys. J. 114, 473.CrossRefGoogle Scholar
Bouigue, R.: 1954, Ann. Astrophys. 17, 104.Google Scholar
Burbidge, E. M. and Burbidge, G. R.: 1957, Astrophys. J. 126, 357.Google Scholar
Gordon, C. P.: 1967, .Google Scholar
Gordon, C. P.: 1968, Astrophys. J. 153, 915.CrossRefGoogle Scholar
Gordon, C. P.: 1971, private communication.Google Scholar
Greene, A. E.: 1971, .Google Scholar
Keenan, P. C.: 1954, Astrophys. J. 112, 219.Google Scholar
Keenan, P. C.: 1971a, Monthly Notices Roy. Astron. Soc. 153, short communication.CrossRefGoogle Scholar
Keenan, P. C.: 1971b, private communication.Google Scholar
Keenan, P. C. and Hynek, J. A.: 1945, Astrophys. J. 101, 265.CrossRefGoogle Scholar
Keenan, P. C. and Morgan, W. W.: 1941, Astrophys. J. 94, 501.CrossRefGoogle Scholar
Marenin, I.: 1971, private communication.Google Scholar
Mendoza, E. E. V. and Johnson, H. L.: 1965, Astrophys. J. 141, 161.Google Scholar
Morgan, W. W.: 1971, private communication.Google Scholar
Peery, B.: 1970, Kitt Peak Symposium of Late-type Stars. Google Scholar
Pettit, E. and Nicholson, S. B.: 1928, Astrophys. J. 68, 279.CrossRefGoogle Scholar
Pettit, E. and Nicholson, S. B.: 1933, Astrophys. J. 78, 320.CrossRefGoogle Scholar
Richer, H. B.: 1971, Astrophys. J. 167, 521.Google Scholar
Shane, C. D.: 1928, Lick Obs. Bull., 13, 123.Google Scholar
Simon, L. W.: 1964, .Google Scholar
Utsumi, K.: 1967, Publ. Astron. Soc. Japan 19, 342.Google Scholar
Warner, B.: 1965, Monthly Notices Roy. Astron. Soc. 129, 263.Google Scholar
Wurm, K.: 1932, Z. Astrophys. 5, 260.Google Scholar
Yamashita, Y.: 1967, Publ. Dominion Astrophys. Observ. 13, no. 5, 67.Google Scholar