The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems

Details The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems

2007-08-22

arxiv.org/abs/0708.3005v1

Astronomy and Astrophysics

Astrophysics

12 pages, 20 figures, in press A&A

Scientific paper

10.1051/0004-6361:20077902

We present a spectroscopic analysis of four massive binary systems that are known or are good candidates to display the Struve-Sahade effect (defined as the apparent strengthening of the secondary spectrum of the binary when the star is approaching, and the corresponding weakening of the lines when it is receding). We use high resolution optical spectra to determine new orbital solutions and spectral types of HD 165052, HD 100213, HD 159176 and DH Cep. As good knowledge of the fundamental parameters of the considered systems is necessary to examine the Struve-Sahade effect. We then study equivalent width variations in the lines of both components of these binaries during their orbital cycle. In the case of these four systems, variations appear in the equivalent widths of some lines during the orbital cycle, but the definition given above can any longer be valid, since it is now clear that the effect modifies the primary spectrum as much as the secondary spectrum. Furthermore, the lines affected, and the way in which they are affected, depend on the considered system. For at least two of them (HD 100213 and HD 159176) these variations probably reflect the ellipsoidal variable nature of the system.

Affiliated with

Also associated with

No associations

Rating

The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-135867