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Binary systems

 

One of our on-going program is the observation of binary systems with one component chemically peculiar stars. The main goal of this project is to resolve the orbit of SB1 and/or SB2 systems by means of accurate radial velocity measurements.

The first paper of this series has been published in 1999:

Orbital elements of binary systems with a Chemically Peculiar star.
F. Leone, G. Catanzaro
1999, Astronomy and Astrophysics, 343, 273

The following pictures have been extracted from it (click to enlarge).

Radial velocity variations of HD 11753

HD 11753

Radial velocity variations of HD 15144

HD 15144

Radial velocity variations of HD 25267

HD 25267

Radial velocity variations of HD 36485

HD 36485

Radial velocity variations of HD 37017

HD 37017

Radial velocity variations of HD 142096

HD 142096

Radial velocity variations of HD 189178

HD 189178

A new project concerns the study of SB2 systems with HgMn components. The first object analyzed was HD191110, whose radial velocities curves of both components are shown in the following figure:

 P = 9.34661 days

 e = 0.1

 w = 220

 g = -8.31 km s-1

 mA/mB = 1.08

more details could be found in the section Abundances of this site or in the paper:

HD 191110 a SB2 system with Hg and HgMn components.
Orbital elements and abundance analysis.
G. Catanzaro, F. Leone, P. Leto
2003, Astronomy and Astrophysics, 407, 669

New results about the study of SB systems with a HgMn component were obtained by our group and published in:

Orbital solutions for SB2 systems with a HgMn component.
G. Catanzaro, P. Leto
2004, Astronomy and Astrophysics, 416, 661

examples of the studied systems have been reported in the following figures

HD 358 HD 32964 HD 33647 HD 173524 HD 174933 HD 216494

 

Spectral variabilty Abundances Binary systems Polarimetry