Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-09-06
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted for publication in Astronomy & Astrophysics
Scientific paper
Context: Some secondary effects are known to introduce variations in spectra of massive binaries. These phenomena (such as the Struve--Sahade effect, difficulties to determine properly the spectral type,...) have been reported and documented in the literature. Aims: We simulate the spectra of circular massive binaries at different phases of the orbital cycle and accounting for the gravitational influence of the companion star on the shape and physical properties of the stellar surface. Methods: We use the Roche potential to compute the stellar surface, von Zeipel theorem and reflection effects to compute the surface temperature. We then interpolate in a grid of NLTE plan-parallel atmosphere model spectra to obtain the local spectrum at each surface point. We finally sum all the contributions (accounting for the Doppler shift, limb-darkening, ...) to obtain the total spectrum. The computation is done for different orbital phases and for different sets of physical and orbital parameters. Results: Our first models reproduce the Struve--Sahade effect for several lines. Another effect, surface temperature distribution is visible but the distribution predicted by our current model is not yet consistent with observations. Conclusions: In some cases, the Struve--Sahade effect as well as more complex line intensity variations could be linked to blends of intrinsically asymmetric line profiles that are not appropriatly treated by the deblending routine. Systematic variations of lines for (nearly) contact systems are also predicted by the model.
Palate Matthieu
Rauw Gregor
No associations
LandOfFree
Spectral modeling of circular massive binary systems: Towards an understanding of the Struve--Sahade effect? 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 Spectral modeling of circular massive binary systems: Towards an understanding of the Struve--Sahade effect?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral modeling of circular massive binary systems: Towards an understanding of the Struve--Sahade effect? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-93050