Hostname: page-component-5c6d5d7d68-wp2c8 Total loading time: 0 Render date: 2024-08-18T05:52:47.053Z Has data issue: false hasContentIssue false
  • English
  • Français

IUE Observations of the Two Peculiar Binary Systems Beta Lyrae and Upsilon Sagittarii

Published online by Cambridge University Press:  14 August 2015

Margherita Hack ,
Umberto Flora  and
Paolo Santin
Margherita Hack
Affiliation:
Astronomical Observatory, Trieste, Italy
Umberto Flora
Affiliation:
Astronomical Observatory, Trieste, Italy
Paolo Santin
Affiliation:
Astronomical Observatory, Trieste, Italy

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 common peculiarities of these two systems are: a) the companion is a massive object (probably m2≥10) whose spectrum is not observable; b) both systems show evidence, though in different degrees, of mass-transfer and mass-loss; c) both present, in different degrees, hydrogen deficiency; d) ultraviolet observations have shown, in both cases, the presence of lines of highly ionized elements like N V, C IV, Si IV, probably formed in an extended envelope because they do not show orbital radial velocity shifts, and cannot be explained by the effective temperature of the star whose spectrum we observe. The latter property seems to be common to several close binaries, as shown by the ultraviolet observations with IUE by Plavec and Koch (1979); e) both systems present infrared excess, suggesting the presence of an extended envelope (Gehrz et al. 1974; Lee and Nariai, 1967; Humphreys and Ney, 1974; Treffers et al. 1976).

Type
V. Algol and Algols
Information
Symposium - International Astronomical Union , Volume 88: Close Binary Stars: Observations and Interpretation , 1980 , pp. 271 - 286
Copyright
Copyright © Reidel 1980 

References

Bohlin, R.C. and Snijders, M.A.J., 1978 IUE NASA Newsletter No. 2, November 1978 Google Scholar
Cassatella, A. and Selvelli, P.L., 1979, Communication to the users, March 7, 1979 Google Scholar
Castor, J.I. and Lamers, H.J.G.L.M., 1979 Astroph. J. Suppl. 39, 481 CrossRefGoogle Scholar
Duvignau, H., Friedjung, M. and Hack, M., 1979 Astron. Astroph. 71, 310 Google Scholar
Flora, U. and Hack, M., 1975 Astron. Astroph. Suppl. 19, 57 Google Scholar
Gehrz, R.D., Hackwell, J.A. and Jones, T.W., 1974 Astroph. J. 191, 675 CrossRefGoogle Scholar
Hack, M., 1960 Contr. Obs. Milano-Merate No. 152 Google Scholar
Hack, M., 1974 Astron. Astroph. 36, 321 Google Scholar
Hack, M., Hutchings, J.B., Kondo, Y., McCluskey, G.E., Plavec, M. and Polidan, R.S., 1975 Astroph. J. 198, 453 CrossRefGoogle Scholar
Hack, M., Hutchings, J.B., Kondo, Y., McCluskey, G.E. and Tulloch, M.K., 1976 Astroph. J. 206, 777 CrossRefGoogle Scholar
Hack, M., Hutchings, J.B., Kondo, Y. and McCluskey, G.E., 1977 Astroph. J. Suppl. 34, 565 CrossRefGoogle Scholar
Hack, M. and Pasinetti, L., 1963 Contr. Obs. Milano-Merate No. 215 Google Scholar
Hack, M. and Selvelli, P.L., 1979 Astron. Astroph. 75, 316 Google Scholar
Humphreys, R.M. and Ney, E.P., 1974 Astroph. J. 190, 339 CrossRefGoogle Scholar
Jamar, C., Macau-Hercot, D., Monfils, A., Thompson, G.I., Houziaux, L. and Wilson, R., 1976 Ultraviolet Bright Star Spectrophotometric Catalogue, European Space Agency, Paris Google Scholar
Kondo, Y., Parsons, S.B., Henize, K.G., Wray, J.D., Benedict, G.F. and McCluskey, G.E., 1976 Astroph. J. 208, 468 CrossRefGoogle Scholar
Kurucz, R.L., 1979 Astroph. J. Suppl. 40, 1 CrossRefGoogle Scholar
Lee, T.A. and Nariai, K., 1967 Astroph. J. 149, L 93 CrossRefGoogle Scholar
Osterbrok, D.E., 1970 Astroph. J. 160, 25 CrossRefGoogle Scholar
Plavec, M.J. and Koch, R.H., 1979 UCLA Preprint No. 60 Google Scholar
Snow, T.P. and Jenkins, E.B., 1977 Astroph. J. Suppl. 33, 269 CrossRefGoogle Scholar
Thompson, G.I., Nandy, K., Jamar, C., Monfils, A., Houziaux, L., Carnochan, D.J. and Wilson, R., 1978 Catalogue of Stellar Ultraviolet fluxes, The Science Research Council Google Scholar
Treffers, R.R., Woolf, N.J., Fink, U. and Larson, H.P., 1976 Astroph. J. 207, 680 CrossRefGoogle Scholar