Abstract
Infrared observations obtained six years apart of the R CrB type star XX Cam do not show any infrared excess, unlike all the other members of the class. The observed colours match a 7000 K black body energy distribution quite well. From the year 1898 till todate, apparently XX Cam has undergone only one visual light minimum in 1940. The lack of infrared excess, the abundance peculiarities and further lack of small amplitude light variations with periods of few tens of days, which are characteristic of R CrB type stars, are discussed in terms of theoretical pulsation models of helium stars.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Alexander, J. B., Andrews, P. J., Catchpole, R. M., Feast, M. W., Lloyd Evans, T., Menzies, J. W., Wisse, P. N. I., Wisse, M. 1972,Mon. Not. R. astr. Soc.,158, 305.
Bateson, F. W. 1972,Inf. Bull. Var. Stars, No. 661.
Bateson, F. W., Jones, A. F. 1973,R. astr. Soc. New Zealand, Var. Stars Sec. Circ., No. 193.
Bidelman, W. P. 1948,Astrophys. J.,107, 413.
Bond, H. E., Luck, E. R., Newman, M. J. 1979,Astrophys. J. 233, 295.
Danziger, I. J. 1965,Mon. Not. R. astr. Soc.,130, 199.
Feast, M. W. 1972,Mon. Not. R. astr. Soc.,158, 11 p.
Feast, M. W. 1975,Variable Stars and Stellar Evolution, Eds V. E. Sherwood and L. Plant, D. Reidel, Dordrecht, p. 129.
Feast, M. W., Glass, I. S. 1973,Mon. Not. R. astr. Soc.,161, 293.
Feast, M. W., Catchpole, R. M., Lloyd Evans, T., Robertson, B. S. C., Dean, J. F., Bywater, R. A. 1977,Mon. Not. R. astr. Soc.,178, 415.
Fernie, J. D., Sherwood, V., DuPuy, D. L. 1972,Astrophys. J.,172, 383.
Fitzgerald, P. M. 1968,Astr. J.,73, 983.
Gaustad, J. 1972,Mem. Soc. R. Sci. de Liege 6e Serie, Tome III, 87.
Glass, I. S. 1978,Mon. Not. R. astr. Soc.,185, 23.
Humphreys, R. H., Ney, E. P. 1974,Astrophys. J.,190, 339.
Johnson, H. L. 1968,Nebulae and Interstellar Matter Eds. B. M. Middlehurst and L. H. Aller, University of Chicago Press, Chicago, p. 167.
Keenan, P. C., Greenstein, J. L. 1963,Contr. Perkins. Obs. Ser II, No. 13, 199.
Kolotilov, E. A., Orlov, M. Ya, Rodriguez, M. H. 1974,Soviet Astr.,17, 615.
Landolt, A. U. 1968,Publ. astr. Soc. Pacific,80, 318.
Landolt, A. U. 1973,Publ. astr. Soc. Pacific,85, 606.
Lee, T. A., Feast, M. W. 1969,Astrophys. J.,157, L173.
Mayan, M. W. 1960,J. R. astr. Soc. Can.,54, 193.
Mayall, M. W. 1972,R. astr. Soc. Can.,66, 233.
O’Keefe, J. A. 1939,Astrophys. J.,90, 294.
Orlov, M. Ya, Rodriguez, M. H. 1974,Astr. Astrophys.,31, 203.
Paczynski, B. 1971,Acta Astr.,21, 1.
Pugach, A. F. 1977,Variable Stars (Russian) 20, 391.
Rao, N. K. 1975,Bull. astr. Soc. India,3, 50.
Rao, N. K. 1980a,Astrophys. Sp. Sci.,70, 480.
Rao, N. K. 1980b,Observatory, (in press).
Rao, N. K., Mallik, S. G. V. 1978,Mon. Not. R. astr. Soc.,183, 211.
Richer, H. B. 1975,Astrophys. J.,197, 611.
Sackman, I. J., Smith, R. L., Despain, K. H. 1974,Astrophys. J.,181, 555.
Schönberner, D. 1975,Astr. Astrophys.,44, 383.
Sherwood, V. E. 1975,in IAU Symp. 67: Variable Stars and Stellar Evolution Eds V. E. Sherwood and L. Plant, D. Reidel, Dordrecht, p. 147.
Stein, W. A., Gaustad, J. E., Gillet, R. C., Kanacke, R. F. 1969,Astrophys. J.,155, L3.
Totochava, A. G. 1973,Astr. Circ. USSR No. 791.
Totochava, A. G. 1975,IAU Symp. 67: Variable Stars and Stellar Evolution Eds V. E. Sherwood and L. Plaut, D. Reidel, Dordrecht, p. 161.
Trimble, V. 1972,Mon. Not. R. astr. Soc. 156, 411.
Warner, B. 1967,Mon. Not. R. astr. Soc. 137, 119.
Waters, B. H. J. 1966,R. astr. Soc. New Zealand, Var. Stars Sec. Circ., No. 119.
Wheeler, T. C. 1978,Astrophys. J.,225, 212.
Yamashita, Y., Nariai, K., Narimoto, Y. 1977,An Atlas of Representative Stellar Spectra, University of Tokyo Press, Tokyo.
Yuin, E. 1948,Astrophys. J.,107, 413.
Zappala, R. R. 1972,Astrophys. J.,172, 51.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kameswara Rao, I., Ashok, N.M. & Kulkarni, P.V. XX Cam—The Inactive R CrB star. J Astrophys Astron 1, 71–78 (1980). https://doi.org/10.1007/BF02727951
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02727951