Hostname: page-component-8448b6f56d-42gr6 Total loading time: 0 Render date: 2024-04-23T19:49:27.540Z Has data issue: false hasContentIssue false

Carbon and Late Type M Stars as Population Indicators

Published online by Cambridge University Press:  14 August 2015

V. M. Blanco
Affiliation:
Cerro Tololo Inter-American Observatory∗
A.A. Hoag
Affiliation:
Kitt Peak National Observatory∗
M. F. McCarthy
Affiliation:
Vatican Observatory

Extract

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.

The discovery of different ratios of carbon (C-type) to oxygen stars (M type) in the direction of the central regions of our own and the nearest galaxies, the Large and Small Magellanic Clouds, is the result of surveys made by Blanco, Blanco and Hoag (unpublished) who observed Baade's Window near NGC 6522 in the direction of our Galaxy's nuclear bulge and by Blanco, Blanco and McCarthy (in press) who observed selected regions in the center of the Large and Small Magellanic Clouds. We have observed each of these central regions with a combination of a grating and prism set in the converging beam of the prime focus of the CTIO 4 meter telescope (Hoag 1976). We used Eastman IV-N plates hypersensitized with silver nitrate solution; the spectral plates were exposed through a Wratten 89 filter for 60 min. We limited our spectral survey to M type stars later then M5 and to the carbon stars, using the criteria of Nassau and colleagues (1949). Thus far no S type stars have been discerned in central regions of the LMC or SMC at the dispersion used (2300 Å/mm).

Type
Part I: Fundamentals of the HR Diagram
Copyright
Copyright © Reidel 1978 

References

Blanco, V. and McCarthy, M.F. (1975). Nature 258, 407.Google Scholar
Clube, S.V.M. and Dawe, J.A. (1978). In IAU Symposium No. 80, The HR Diagram, Philip, A.G.D. and Hayes, D.S., eds., Reidel, Dordrecht, p.53.Google Scholar
Gaposchkin, C.P. (1971). The Magellanic Clouds, Muller, A.B., ed., Reidel, Dordrecht, p. 34.Google Scholar
Gascoigne, S.C.B. (1969). Mon. Not. Roy. Astron. Soc. 146, 1.Google Scholar
Graham, J. (1974.). ESO/SCR/CERN: Conference on Research Programs for the New Large Telescopes, Reiz, A., ed., Geneva, p. 159.Google Scholar
Hagen, G. and van den Bergh, S. (1974). Astrophys. J. 189, L103.Google Scholar
Hoag, A.A. (1976). Publ. Astron. Soc. Pacific 88, 860.Google Scholar
Nassau, J.J. and Van Albada, G.B. (1949). Astrophys. J. 109, 391.Google Scholar
Oort, J.H. (1971). The Magellanic Clouds, Muller, A.B., ed., Reidel, Dordrecht, p. 185.Google Scholar
Oort, J.H. and Plaut, L. (1975). Astron. Astrophys. 41, 71.Google Scholar
Sanduleak, N., MacConnell, D.J. and Hoover, P.S. (1972). Nature 237, 28.CrossRefGoogle Scholar
Tifft, W. and Snell, C. (1971). Mon. Not. Roy. Astron. Soc. 151, 365.Google Scholar