Abstract
A comparison between model atmosphere grids with and without metal blanketing has been performed in the low-temperature range (T eff=6000 K to 10000 K) and for different metal contents (logA=0, −1, −2;A=scaled solar abundance). ForA≤10−1 andT eff≥7000 K, the Johnson colour indicesU-B andB-V, together with the Strömgrenu-b, b-y and the bolometric correction (BC) are little affected by metal blanketing (Δ mag<0 m. 04). On the other hand, the trend of the physical quantities and them 1 andc 1 colour indices reflect the inadequateness of the models even withA=10−2 andT eff=9500 K, where hydrogen line blanketing is expected to dominate. This fact discourages once and for all the use of metal unblanketed atmospheres other than for comparison of colour indices or the calculation of bolometric corrections for Population II A-F spectral types.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Allen, C. W.: 1973,Astrophysical Quantities, Athlone Press, London.
Azusiensis, A. and Straizys, V.: 1969,Soviet Astron. A.J. 13, 316.
Bessel, M. S. and Wickramasinghe, D. T.: 1979,Astrophys. J. 227, 232.
Breger, M.: 1974,Astrophys. J. 192, 75.
Buser, R. and Kurucz, R. L.: 1978,Astron. Astrophys. 70, 555.
Corliss, C. H. and Bozman, W. R.: 1962, NBS Monograph 53.
Crawford, D. L.: 1966,IAU Symp. 24, 170.
Gehren, T.: 1977,Astron. Astrophys. 59, 303.
Gustafsson, B., Bell, R. A., Eriksson, K. and Nordlund, A.: 1975,Astron. Astrophys. 42, 407.
Hayes, D. S. and Latham, D. W.: 1975,Astrophys. J. 197, 593.
Kamp, L. W. and Deupree, R. G.: 1979,Publ. Astron. Soc. Pacific 91, 681.
Kurucz, R. L.: 1970, S.A.O. Special Report, No. 309.
Kurucz, R. L.: 1979, Preprint Series, No. 1050, Center for Astrophysics, Cambridge, Mass.
Kurucz, R. L., Peytremann, E. and Avrett, E. H.: 1974,Blanketed Model Atmospheres for Early-Type Stars, Smithsonian Inst. Press, Washington, D.C.
Lee, P. and O'Brien, A.: 1977,Astron. Astrophys. 60, 259.
Matsushima, S.: 1969,Astrophys. J. 158, 1137.
McNamara, D. H. and Colton, D. J.: 1969,Publ. Astron. Soc. Pacific 81, 826.
Osmer, P. S. and Peterson, D. M.: 1974,Astrophys. J. 187, 117.
Peytremann, E.: 1970, Ph.D. Thesis, Université de Genève.
Relyea, L. J. and Kurucz, R. L.: 1978,Astrophys. J. Suppl. 37, 45.
Rossi, L.: 1979,Astron. Astrophys. 74, 195.
Strömgren, B.: 1963,Quart. J. Roy. Astron. Soc. 4, 8.
Wickramasinghe, D. T., Bessel, M. S. and Cottrell, P. L.: 1977,Astrophys. J. 217, L65.
Wright, S. L. and Argyros, J. D.: 1975,Comm. Univ. Coll. London Obs. No. 75.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Moretti, M., Rossi, L. On the possibility of using metal unblanketed model atmospheres for analysis of population II stars. Astrophys Space Sci 73, 379–387 (1980). https://doi.org/10.1007/BF00642416
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00642416