SIMBAD references

We present observations of the hierarchical triple-lined spectroscopic triple system HD 109648. Using an extended version of a new two-dimensional cross-correlation technique, TODCOR, we derive radial velocities independently for each component of the system. From a simultaneous orbital solution for hierarchical triple systems, we determine orbital elements for the inner and outer orbits. With a very short outer orbital period, and a small outer-to-inner period ratio, HD 109648 is one of the best candidates in which to observe evolution in the orbital elements of a hierarchical triple system.