Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-12T16:37:31.988Z Has data issue: false hasContentIssue false
  • English
  • Français

Main Sequences Defined by Hyades and Field Stars

Published online by Cambridge University Press:  14 August 2015

Arthur R. Upgren
Arthur R. Upgren*
Affiliation:
Van Vleck Observatory, Wesleyan University

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.

This paper reviews the main sequences defined by members of the Hyades cluster and by the field stars in the solar neighborhood. For this purpose, the discussion is limited primarily to the stars of the lower portions of the main sequence, especially those of spectral classes K and early M. There are two reasons for emphasis on the faint red dwarf stars. First, the value of a parallax depends on its size or, more accurately, on the error in parallax divided by the parallax itself. Large parallaxes of high precision occur in large numbers only for stars inhabiting the lower main sequence. Furthermore, brighter stars of earlier spectral classes are more likely to be influenced by evolutionary effects which may differ between the Hyades and field stars, and which are difficult to calibrate.

Type
Part I: Fundamentals of the HR Diagram
Information
Symposium - International Astronomical Union , Volume 80: The HR Diagram , 1978 , pp. 39 - 48
Copyright
Copyright © Reidel 1978 

References

Eggen, O.J. (1968). Astrophys. J. Suppl. 16, 49.Google Scholar
Eggen, O.J. (1969). Astrophys. J. 158, 1109.Google Scholar
Eggen, O.J. (1971). In IAU Symposium No. 42, White Dwarfs, Luyten, W.J., ed., D. Reidel, Dordrecht, p. 8.CrossRefGoogle Scholar
Eggen, O.J. (1973). Astrophys. J. 182, 821.Google Scholar
Eggen, O.J. (1974). Publ. Astron. Soc. Pacific 86, 697.Google Scholar
Eggen, O.J. and Greenstein, J.L. (1965). Astrophys. J. 141, 83.Google Scholar
Gliese, W. (1969a). Veröeffentl. Astron. Rechen-Inst. Heidelberg, No. 22.Google Scholar
Gliese, W. (1969b). In Proccedings of the Symposium on Low-Luminosity Stars, Kumar, S.S., ed., Gordon and Breach, New York, p. 41.Google Scholar
Gliese, W. (1971). Veröeffentl. Astron. Rechen-Inst. Heidelberg, No. 24.Google Scholar
Greenstein, J.L. (1965). In Stars and Stellar Systems, Vol. V, Galactic Structure, Blaauw, A. and Schmidt, M., eds., University of Chicago Press, Chicago, p. 361.Google Scholar
Hanson, R.B. (1975). Astron. J. 80, 379.Google Scholar
Hartwick, F.D.A., Crampton, D. and Cowley, A.P. (1976). Astrophys. J. 208, 776.Google Scholar
Johnson, H.L. and Knuckles, C.F. (1955). Astrophys. J. 122, 209.Google Scholar
Johnson, H.L., Mitchell, R.I. and Iriarte, B. (1962). Astrophys. J. 136, 75.Google Scholar
Kron, G.E. (1954). In Proceedings of the Third Berkeley Symposium on Mathematical Statistics and Probability, University of California, Berkeley, p. 39.Google Scholar
Kron, G.E., Gascoigne, S.C.B. and White, H.S. (1957). Astron. J. 62, 205.Google Scholar
Lutz, T.E. and Kelker, D.H. (1973). Publ. Astron. Soc. Pacific 85, 573.Google Scholar
Luyten, W.J. (1971). The Hyades, University of Minnesota, Minneapolis.Google Scholar
Pels, G., Oort, J.H. and Pels-Kluyver, H.A. (1975). Astron. and Astrophys. 43, 423.Google Scholar
Upgren, A.R. (1972). Astron. J. 77, 745.Google Scholar
Upgren, A.R. (1973). Astron. J. 78, 79.Google Scholar
Upgren, A.R. (1974). Astrophys. J. 193, 359.Google Scholar
Upgren, A.R. (1975). In Multicolor Photometry and the Theoretical HR Diagram, Philip, A.G.D. and Hayes, D.S., eds., Dudley Obs. Rept. No. 9, p. 437.Google Scholar
Upgren, A.R. and Weis, E.W. (1975). Astrophys. J. 197, L53.Google Scholar
Upgren, A.R. and Weis, E.W. (1977). Astron. J. 82, 978.CrossRefGoogle Scholar
van Altena, W.F. (1969). Astron. J. 74, 2.Google Scholar
van Altena, W.F. (1974). Publ. Astron. Soc. Pacific 86, 217.CrossRefGoogle Scholar
van Bueren, H.G. (1952). Bull. Astron. Inst. Neth. XI, 385.Google Scholar
Veeder, G.J. (1974). Astron. J. 79, 1056.Google Scholar
Vyssotsky, A.N. (1963). In Stars and Stellar Systems, Vol. III, Basic Astronomical Data, Strand, K. Aa., ed., University of Chicago Press, Chicago, p. 192.Google Scholar
Wielen, R. (1974). In IAU Highlights of Astronomy, Contopoulos, G. ed., D. Reidel, Dordrecht, p. 395.CrossRefGoogle Scholar
Wilson, O. and Woolley, R. (1970). Monthly Notices Roy. Astron. Soc. 148, 463.Google Scholar