Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-20T03:41:48.320Z Has data issue: false hasContentIssue false
  • English
  • Français

Study of Spectroscopic Binaries with the Objective Prism Method†

Published online by Cambridge University Press:  12 April 2016

Frank Gieseking
Frank Gieseking*
Affiliation:
Observatorium Hoher List der Universitäts-Sternwarte Bonn, W. Germany

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 frequency distribution of SB’s over apparent visual magnitude emerging from the catalogue of Batten et. al. (1978) shows a very steep decrease of the number of spectroscopically detected SB’s already for such bright stars of magnitude 7. Considering the number of all stars in the individual magnitude intervals, we find a kind of completeness parameter of the spectroscopic surveys: If we scale it somewhat optimistically at 100% between 0 and 3 mag, we see a 50% decrease of the completeness of our knowledge of stellar radial velocities already for stars fainter than 4.5 mag.

This situation is mainly due to the fact that the measurement of radial velocities with conventional slit spectrographs is extremely laborious, requiring long exposure times at large telescopes for the exposure of only one spectrum at a time. – Therefore more efficient methods for radial velocity determinations of fainter stars are urgently needed.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 62: Current Techniques in Double and Multiple Star Research , May 1983 , pp. 104 - 107
Copyright
Copyright © Lowell Observatory 1983

Footnotes

†

based on observations collected at the European Southern Observatory, La Silla, Chile

References

Batten, A.H., Fletcher, J.M., Mann, P.J.: 1978, Publ. Dom. Astrophys. Obs. Vol. XV, No. 5 Google Scholar
Bok, B.J., McCuskey, S.W.: 1937, Harvard Obs. Ann. 105, 327 Google Scholar
Campbell, B., Walker, G.A.H.: 1979, Publ. Astron. Soc. Pacific 91, 540 CrossRefGoogle Scholar
Gieseking, F.: 1976, Astron. Astrophys. 47, 43 Google Scholar
Gieseking, F.: 1980, Astron. Astrophys. Suppl 41, 245 Google Scholar
Gieseking, F.: 1981a, Astron. Astrophys. Suppl. 33, 33 Google Scholar
Gieseking, F.: 1981b, Astron. Astrophys. 99, 155 Google Scholar
Fehrenbach, Ch.: 1947, Ann d’Astrophys. 99, 257 and 306 Google Scholar
Hale, Wadsworth: 1896, Astrophys. J. 4, 54 CrossRefGoogle Scholar
Milman, P.M.: 1931, Harvard Ob. Circ. 357Google Scholar
Pickering, E.C.: 1887, Henry Draper Mem., First Ann. ReportGoogle Scholar
Schwarzschild, K.: 1913, Publ. Astron. Obs. Potsdam 23, Nr. 69 Google Scholar
Stock, J., Upgren, A.R.: 1968, Publ. Dep. Astron. Univ. Chile 1, 11 Google Scholar
Stock, J., Osborn, W.: 1980, Astron. J. 85, 1366 CrossRefGoogle Scholar