Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-14T23:43:07.195Z Has data issue: false hasContentIssue false
  • English
  • Français

A Study of Ultraviolet Spectra of Delta Sagittae

Published online by Cambridge University Press:  07 August 2017

A. Akalin  and
S. Engin
A. Akalin
Affiliation:
University of Ankara Dept. of Astronomy and Space Sciences 06100 Tandogan, Ankara Turkiye
S. Engin
Affiliation:
University of Ankara Dept. of Astronomy and Space Sciences 06100 Tandogan, Ankara Turkiye

Abstract

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.

High resolution spectrum of the VV Cephei type star δ Sge (M2 II + A0 V) observed with the IUE satellite between 1979–1985 have been analysed. The radial velocity curves of non blended absorption features have been formed. Observed radial velocities are compared with the theoretical radial velocity curve due to orbital motion. We found that observed radial velocity variation is the resultant of radial velocity of hotter component and wind velocity around this star. The wind is perturbed by hotter component. Matching the UV continuum fluxes obtained from IUE high resolution spectra to fluxes of Kurucz model atmospheres yields Te=11000±500 °K. Thus the spectral type of hot component was found as A0.

Type
Oral and Contributed Papers
Information
Symposium - International Astronomical Union , Volume 151: Evolutionary Processes in Interacting Binary Stars , 1992 , pp. 273 - 275
Copyright
Copyright © Kluwer 1992 

References

Batten, A. and Fisher, W. A. (1981) ‘Spectroscopic evidence for an atmospheric eclipse of δ Sagittae’, Publications of the Astronomical Society of the Pacific, 93, 769–771.Google Scholar
Batten, A. (1986) ‘Interm discussion of the orbit of δ Sagittae’, Highlight of Astronomy, Swings, J. P. (ed.), Reidel Publ., Dordrecht, 207–209.CrossRefGoogle Scholar
Reimers, D. and Kudritzki, R. P. (1981) ‘Observational evidence for an accretion disk around the B star companion of δ Sge (M2 II)’, Proceedings of Second European IUE Conference, Tubingen, Germany, 26–28 March 1980 (ESA SP-157), 229–232.Google Scholar
Reimers, D. and Schroder, K. P. (1983) ‘A study of UV spectra of ζ Aur/VV Cep stars’, Astronomy and Astrophysics, 124, 241–246.Google Scholar
Reimers, D. and Schroder, K. P. (1989) ‘Observations of modulation and phase displacement of the stellar wind in six red giant spectroscopic binaries’, Astronomy and Astrophysics, 214, 261–266.Google Scholar