Acta Astron., 66, 293-306 (2016/August-0)
High Proper Motion Objects toward the Inner Milky Way: Characterization of Newly Identified Nearby Stars from the VISTA Variables in the Via Lactea Survey.
GROMADZKI M., KURTEV R., BEAMIN J.C., TEKOLA A., RAMPHUL R., IVANOV V.D., MINNITI D., FOLKES S.L., VAISANEN P., KNIAZEV A.Y., BORISSOVA J., PARSONS S.G. and VILLANUEVA V.
Abstract (from CDS):
The census of the Solar neighborhood is still incomplete, as demonstrated by recent discoveries of many objects within 5-10 pc from the Sun. The area around the mid-plane and bulge of the Milky Way presents the most difficulties in searches for such nearby objects, and is therefore deficient in the known population. This is largely due to high stellar densities encountered. Spectroscopic, photometric and kinematic characterization of these objects allows better understanding of the local mass function, the binary fraction, and provides new interesting targets for more detailed studies. We report the spectroscopic follow-upand characterization of twelve bright high proper motion objects, identified from the VISTA Variables in Via Lactea survey(VVV). We used the 1.9-m telescope of the South African Astronomical Observatory (SAAO) for low-resolution optical spectroscopy and spectral classification, and the MPG/ESP 2.2-m telescope Fiber-fed Extended Range Optical Spectrograph (FEROS) high-resolution optical spectroscopy to obtain the radial and space velocities for three of them. Six of our objects have co-moving companions. We derived optical spectral types and photometric distances, and classified all of them as K and M dwarfs within 27-264 pc from the Sun. Finally, we found that one of the sources, VVV J141421.23-602326.1 (a co-moving companion ofVVV J141420.55-602337.1), appears to be a rare massive white dwarf located close to the ZZ Cet instability strip in the CMD and CC diagrams. Many of the objects in our list are interesting targets for exoplanet searches.
Proper motions - Stars: low - mass - white dwarfs - binaries: visual - solar neighborhood - Techniques: spectroscopic
Status at CDS
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