Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-30T01:50:25.284Z Has data issue: false hasContentIssue false
  • English
  • Français

Rotation Broadening and the Shapes of W Ursae Majoris Stars

Published online by Cambridge University Press:  14 August 2015

Lawrence Anderson ,
Malcolm Raff  and
Frank H. Shu
Lawrence Anderson
Affiliation:
University of Toledo, Toledo, Ohio U.S.A.
Malcolm Raff
Affiliation:
University of California, Berkeley, California U.S.A.
Frank H. Shu
Affiliation:
University of California, Berkeley, California U.S.A.

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.

We extract rotation broadening functions from the spectra of W Ursae Majoris Stars. Using a fast Fourier transform we deconvolve photographic spectra, covering some 500 A including dozens of strong lines, with equivalent spectra from non-rotating stars of similar spectral type. The resulting rotation functions contain information about global features such as the shape of the stellar surface (e.g. mass ratio and degree of contact), gravity brightening and limb darkening. We present preliminary data on the stars VW Cep and ER Vul. The rotation function of the former reveals the presence of the third component found visually by Heintz (1975), while that of the latter shows it to be detached and have mass ratio 0.9.

Type
IX. Contact Binaries
Information
Symposium - International Astronomical Union , Volume 88: Close Binary Stars: Observations and Interpretation , 1980 , pp. 485 - 489
Copyright
Copyright © Reidel 1980 

References

Anderson, L. and Shu, F.H.: 1977, Astrophys. J., 214, pp. 798–808.CrossRefGoogle Scholar
Anderson, L. and Shu, F.H.: 1979, Astrophys. J. Suppl., 40, pp. 667–697.Google Scholar
Binnendijk, L.: 1967, Publ. Dominion Astrophys. Obs., Vol. XIII, No. 3.Google Scholar
Gray, D.F.: 1976, “The Observation and Analysis of Stellar Photospheres,” John Wiley and Sons, New York, pp. 394–400.Google Scholar
Heintz, W.D.: 1975, IAU Inf. Circ. Visual Double Stars No. 64.CrossRefGoogle Scholar
Hershey, J.L.: 1975, Astron. J., 80, pp. 662–667.CrossRefGoogle Scholar
Kuiper, G.P.: 1941, Astrophys. J., 93, pp. 133–177.Google Scholar
Kukarkin, B.V., Kholopov, P.N., Efremov, Yu. N., Kukarkina, N.P. Kurochkin, N.E., Medvedeva, G.I., Perova, N.B., Fedorovich, V.P., and Frolov, M.S.: 1969, “General Catalogue of Variable Stars”, Moscow.Google Scholar
Lucy, L.B.: 1967, Zs. f. Ap., 65, pp. 89–92.Google Scholar
Lucy, L.B.: 1968a, Astrophys. J., 151, pp. 1123–1135.Google Scholar
Lucy, L.B.: 1968b, Astrophys. J., 153, pp. 877–884.Google Scholar
Northcott, R.J., and Bakos, G.A.: 1956, Astron. J., 61, p. 188.Google Scholar
Osaki, Y.: 1965, Publ. Astron. Soc. Japan, 17, pp. 97–105.Google Scholar
Rucinski, S.: 1971, Bull. Am. Astron. Soc., 3, p. 237.Google Scholar
Shajn, G., and Struve, O.: 1929, Monthly Notices R.A.S., 89, pp. 222–239.Google Scholar
Shu, F.H., Lubow, S.H., and Anderson, L.: 1976, Astrophys. J., 209, pp. 536–546 Google Scholar
Simkin, S.M.: 1974, Astron. Astrophys., 31, pp. 129–136.Google Scholar