High Proper Motion Objects toward the Inner Milky Way: Characterization of Newly Identified Nearby Stars from the VISTA Variables in the Vía Láctea Survey

• Autorzy: Gromadzki M. , Kurtev R. , Beamán J. C. , Tekola A. , Ramphul R. , Ivanov V. D. , Minniti D. , Folkes S. L. , Vaisanen P. , Kniazev A. Y. , Borissova J. , Parsons S. G. , Villanueva V.
• Języki publikacji: EN

Abstrakty

EN

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-up and characterization of twelve bright high proper motion objects, identified from the VISTA Variables in Vía Láctea 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 of VVV 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.

Słowa kluczowe

EN

proper motions; stars: low-mass; white dwarfs; binaries: visual; solar neighborhood; techniques: spectroscopic

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2016
• Tom: Vol. 66, No. 3
• Strony: 293--306
• Opis fizyczny: Bibliogr. 65 poz., rys., tab., wykr.

Twórcy

autor

Gromadzki M.

• Millennium Institute of Astrophysics, Av. Vicua Mackenna 4860, 782-0436, Macul, Santiago, Chile
• Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile

autor

Kurtev R.

• Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile
• Millennium Institute of Astrophysics, Av. Vicua Mackenna 4860, 782-0436, Macul, Santiago, Chile

autor

Beamán J. C.

• Millennium Institute of Astrophysics, Av. Vicua Mackenna 4860, 782-0436, Macul, Santiago, Chile
• Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile

autor

Tekola A.

• Las Cumbres Observatory Global Telescope Network, Inc., 6740 Cortona Drive, Suite 102, Goleta, CA 93117, USA

autor

Ramphul R.

• South African Astronomical Observatory, P.O. Box 9 7935, South Africa
• University of Cape Town, Astronomy Department, Rondebosch 7701, South Africa

autor

Ivanov V. D.

• European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany

autor

Minniti D.

• Departamento de Ciencias Físicas, Universidad Andres Bello, Republica 220, Santiago, Chile
• Millennium Institute of Astrophysics, Av. Vicua Mackenna 4860, 782-0436, Macul, Santiago, Chile
• Vatican Observatory, V00120 Vatican City State, Italy

autor

Folkes S. L.

• 9Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK
• Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile

autor

Vaisanen P.

• South African Astronomical Observatory, P.O. Box 9 7935, South Africa

autor

Kniazev A. Y.

• South African Astronomical Observatory, P.O. Box 9 7935, South Africa
• Southern African Large Telescope Foundation, P.O. Box 9 7935, South Africa
• Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia

autor

Borissova J.

• Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile
• Millennium Institute of Astrophysics, Av. Vicua Mackenna 4860, 782-0436, Macul, Santiago, Chile

autor

Parsons S. G.

• Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK

autor

Villanueva V.

• Millennium Institute of Astrophysics, Av. Vicua Mackenna 4860, 782-0436, Macul, Santiago, Chile
• Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña 1111, Playa Ancha, Casilla 5030, Valparaíso, Chile

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).