Discovery of an M8.5 Dwarf With Proper Motion mu=2.38 arcsec/yr

Abstract

We report the discovery of LSR1826+3014, a very faint (V=19.36) star with a very large proper motion (mu=2.38 arcsec/yr). A low resolution red spectrum reveals that LSR1826+3014 is an ultra-cool red dwarf with spectral type M8.5 V and with a radial velocity v_rad=+77+/-10 km/s. LSR1826+3014 is thus the faintest red dwarf ever discovered with a proper motion larger than 2 arcsec/yr. Optical and infrared photometry suggest that the star is at a distance d=13.9+/-3.5 pc from the Sun, which implies it is moving relative to the local standard of rest with a total velocity of 175+/-25 km/s. Numerical integration of its orbit suggests that LSR1826+3014 is on a halo-like galactic orbit.

arXiv comment12 pages, including 1 table and 3 figures, accepted for publication in The Astrophysical Journal Letters

References in corpus (7)

• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• Local stellar kinematics from Hipparcos data
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• New High Proper Motion Stars from the Digitized Sky Survey. I. Northern Stars with proper motion between 0.5 and 2.0 arcsec/yr at Low Galactic Latitudes
• Meeting the Cool Neighbours I: Nearby stars in the NLTT Catalogue - Defining the sample
• Discovery of high proper motion ancient white dwarfs: nearby massive compact halo objects?
• The First Orbital Period for a Dwarf Nova in a Globular Cluster: V101 in M5

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