Comments on the Apsidal Period of V1647 Sagittarii

Volume 28 number 1 (2000)

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Rodica Roman

Abstract

The apsidal motion of V1647 Sagittarii is reviewed and some doubts are put in evidence: for some photographic observed minima an absurd result is obtained (cos(a) < -1), and from the photoelectric and spectroscopic observations it is found that two values of the apsidal period (U = 727 and U = 648 years) have the same degree of probability. The binary system V1647 Sgr is therefore recomended for new series of photoelectric and spectroscopic observations.