Spectroscopic study of the binary system HD 153919.

ABSTRACT. We report preliminary results on RD 153919. It was observed at SAAO on June 17-25, July 15-22, 1986, covering four cycles with the RPCS of the 1.9 ir telescope. UV spectra were also obtained with the lUE satellite on 22 July, 1986. The most outstanding features of UT spectra are: 1-SiIV: with a P Cyg asymmetric profile, and with a wide and strong absorption component that has radial velocities of about -1800 kin/sec thus indicating the presence of the envelope and perhaps gaseous streams. C IV: on the contrary, does not show us the features, because the two components are too close together. 2-One non-identified emission line in 2483 that shows variations in intensity in one hour, may perhaps be related to the x-ray source. In optical spectra, we observed, at phase 0.75, one strong and wide coinponent of HeI-D3 a radial velocity -700 km/sec. We have not reached any definite conclusion, as yet; we are continuing analyzing and studying all the data obtained through the observations. : LINE-PROFILE -- STARS-BINART