Hostname: page-component-84b7d79bbc-5lx2p Total loading time: 0 Render date: 2024-07-27T11:32:37.507Z Has data issue: false hasContentIssue false
  • English
  • Français

On the Problem of the Chemical Composition of β Lyrae

Published online by Cambridge University Press:  14 August 2015

V. Bahýl
V. Bahýl*
Affiliation:
96201 Zvolenská Slatina 82, Czechoslovakia

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.

Two determinations of helium abundance in the primary β Lyrae's component existed before 1975. According to Boyarchuk (1959) helium is 631 times overabundant relative to hydrogen and according to Hack and Job (1965) the ratio He/H varies from 1 to 2.25 depending on the effective temperature. We started to examine this probleme with the aim to decide between these extreme results. In the meantime there were published two papers by Leushin at al. (1977, 1979) in which there was found, that He/H = 1.5 for Teff = 12 000 °K and log g = 2.5. The earlier results were based on equivalent widths analysis with curve of growth method. The authors of newly published papers have started from convenient models of the atmosphere, calculated equivalent widths and compared them with observation. In our paper (Bahýl′ 1979) we started from models of the atmosphere, too. Then we calculated the theoretical profiles. We have found the best fit for the model Böhm-Vitense (1967), Teff = 12 900 °K, log g = 2 and He/H = 2.72, as shown in Fig. 1.

Type
III. Spectroscopy
Information
Symposium - International Astronomical Union , Volume 98: Be Stars , 1982 , pp. 205 - 208
Copyright
Copyright © Reidel 1982 

References

Bahýl’, V.: 1979, , Astron. Inst. SAV, Skalnaté Pleso.Google Scholar
Boyarchuk, A. A.: 1959, Astron. Zh. 36, pp. 766–776.Google Scholar
Böhm-Vitense, E.: 1967, Astrophys. J. 150, pp. 483–500.Google Scholar
Carbon, D. F., Gingerich, O.: 1969, in Theory and Observation of Normal Stellar Atmospheres, ed. Gingerich, O., M. I. T. Press, pp. 377–472.Google Scholar
Klinglesmith, D. A.: 1971, NASA SP-3065, Wahington DC.Google Scholar
Leushin, V. V., Nevskij, M. Yu., Snezhko, L. I., Sokolov, V. V.: 1977, Astrofiz. Issled. 9, pp. 3–15.Google Scholar
Leushin, V. V., Nevskij, M. Yu., Snezhko, L. I.: 1979, Astrofiz. Issled. 11, pp. 40–50.Google Scholar
Mihalas, D.: 1966, Astrophys. J., Suppl. Ser. 114, pp. 1–30.Google Scholar