Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..215g&link_type=abstract
Astronomy and Astrophysics, Vol.107, P. 215, 1982
Astronomy and Astrophysics
Astrophysics
9
Scientific paper
Using the File of Spectroscopic Binaries of the Toulouse Observatory we have re-examined some results concerning spectroscopic binaries (SB) among A and Am stars.
In the first part of this paper we present the distributions in magnitude, spectral types and orbital periods and some UBV diagrams. We found very few SB's later than A4 (where the Am region begins); as a consequence 70 % of the A-type SB's known are early A-type stars (AO-A3).
In the second part of the paper we repeated the work of Abt and Bidelman (1969) concerning the distribution over spectral types and orbital periods. Using their same ranges ( , Iv-V and 2.5-100 days) we found that 85% of the SB's are Am's, 15% are A's.
Therefore we do not confirm the result of Abt and Bidelman that all stars in the range (A4-F1, IV-V; 2.5-100 days) are Am stars. We propose that the explanation is to be found in observational bias.
Carquillat Jean-Michel
Ginestet Nicole
Jaschek Mercedes
Pedoussaut A.
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