Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-25T17:15:30.587Z Has data issue: false hasContentIssue false
  • English
  • Français

Red Variables

Published online by Cambridge University Press:  12 April 2016

P. R. Wood
P. R. Wood*
Affiliation:
Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH, England

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 will be concerned with those variables lying on the cool side of the cepheid strip in the region of the HR diagram occupied by the red giant and supergiant stars. The blue edge of the red variable region for old disk population stars has been found by Eggen (1973b) to be at (R-I)K˜ 0.9 (log Teff˜ 3.53). According to Eggen (1973a, 1973b), all giant stars cooler than this vary, although the amplitude is very small (ΔV~0.2 mag) near the blue edge. In the halo population the blue edge is considerably hotter at (R-I)K˜ 0.5 (log Teff˜ 3.62). On the other hand, some small amplitude red variables (eg. R Dor, AK Hya, IQ Her) have been found at the low temperatures (RK-RK > 1.6) where large amplitude red (Mira) variables exist. From these results, it appears that the position of the blue edge deoends on some unknown stellar parameter(s). Auman (1971) has suggested that the helium abundance may be involved.

Type
Invited Papers
Information
International Astronomical Union Colloquium , Volume 29: Multiple Periodic Variable Stars , 1976 , pp. 69 - 85
Copyright
Copyright © Reidel 1976

References

Andrews, P.J., Feast, M.W., Lloyd Evans, T., Thackeray, A.D. and Menzies, J.W. 1974, Observatory, 94, 133.Google Scholar
Auman, J.R. 1971, Contr. Kitt Peak National Obs., No. 554, p. 241–246.Google Scholar
Campbell, L. 1926, Haryard Annals, 79, 91.Google Scholar
Campbell, L. 1955, Studies of Long Period Variables, AAVSO, Cambridge, Mass.Google Scholar
du Puy, D.L. 1973, Astrophys. J., 185, 597.Google Scholar
Eddington, A.S. and Plakidis, S. 1929, Mon. Not. Roy. astr. Soc. 90, 65.Google Scholar
Eggen, O.J. 1971, Astrophys. J., 165, 317.Google Scholar
Eggen, O.J. 1972, Astrophys. J., 172., 639.CrossRefGoogle Scholar
Eggen, O.J. 1973a, Memoirs Roy. astr. Soc, 77, 159.Google Scholar
Eggen, O.J. 1973b, Astrophys. J., 184, 793.Google Scholar
Eggen, O.J. 1975, Astrophys. J., 195, 661.Google Scholar
Epstein, I. 1950, Astrophys. J., 112, 6.CrossRefGoogle Scholar
Feast, M.W. 1963, Mon. Not. Roy. astr. Soc, 125, 367.Google Scholar
Feast, M.W. 1972, in Fernie, J.D. (ed.), Variable Stars in Globular Clusters and in Related Systems, D. Reidel, Dordrecht-Holland, p. 131.Google Scholar
Feast, M.W. and Glass, I.S. 1973, Mon. Not. Roy. astr. Soc, 161, 293.Google Scholar
Feast, M.W., Woolley, R. and Yilmaz, N. 1972, Mon. Not. Roy. astr. Soc., 158, 23.Google Scholar
Fischer, P.L. 1969, in Detre, L. (ed.), Non-periodic Phenomena in Variable Stars, D. Reidel, Dordrecht-Holland, p. 331.Google Scholar
Fritzová, L., Pěkný, Z. and Śvestka, Z. 1954, Bull. astr. Inst. Czech., 5, 49.Google Scholar
Gehrz, R.D. 1972, Astrophys. J., 178, 715.Google Scholar
Gingold, R.A. 1974, Astrophys. J., 193. 177.CrossRefGoogle Scholar
Johnson, H.L. 1966, Ann. Rev. Astr. and Astrophys., 4, 193.Google Scholar
Keeley, D.A. 1970, Astrophys. J., 161, 657.CrossRefGoogle Scholar
Kukarkin, B.V. et al. 1969, General Catalogue of Variable Stars, third edition, Moscow.Google Scholar
Lacy, C.H. 1973, Astr. J., 78, 90.CrossRefGoogle Scholar
Langer, G.E. 1971, Mon. Not. Roy. astr. Soc, 155. 199.Google Scholar
Langer, G.E., Kraft, R.P. and Anderson, K.S. 1974, Astrophys. J., 189, 509.Google Scholar
Lockwood, G.W. and Wing, R.F. 1971, Astrophys. J., 169, 63.Google Scholar
Mayall, M. 1965, J. Roy. astr. Soc. Canada, 59, 245.Google Scholar
Payne-Gaposhkin, C. 1954, Harvard Annals, 113, 191.Google Scholar
Plakidis, S. 1932, Mon. Not. Roy. astr. Soc, 92., 460.CrossRefGoogle Scholar
Sacharow, G.P. 1953, Variable Stars, 9, 175.Google Scholar
Schwarzschild, M. 1975, Astrophys. J., 195, 137.Google Scholar
Schwarzschild, M. and Harm, R. 1967, Astrophys. J., 150, 961.CrossRefGoogle Scholar
Sterne, T.E. and Campbell, L. 1937, Harvard Annals, 105, 459.Google Scholar
Sweigert, A.V. 1971, Astrophys. J., 168, 79.Google Scholar
van der Bilt, J. 1934, Mon. Not. Roy. astr. Soc, 94, 846.Google Scholar
Wood, P.R. 1974, Astrophys. J., 190, 609.Google Scholar
Wood, P.R. 1975, Mon. Not. Roy. astr. Soc, 171, 15p.Google Scholar