Search for nearby stars among proper motion stars selected by optical-to-infrared photometry - III. Spectroscopic distances of 322 NLTT stars

Distance estimates based on low-resolution spectroscopy and Two Micron All Sky Survey (2MASS) J magnitudes are presented for a large sample of 322 nearby candidates from Luyten's NLTT catalogue. Mainly relatively bright (typically 7 100 pc) objects have also been identified, including a probable halo, but relatively hot (T eff ∼ 13 000 K) white dwarf (LHS 1200) and 10 red dwarfs with extremely large tangential velocities (250 < v t < 1150 km s -1 ). Altogether, there are 11 red dwarfs (including one within 70 pc) with tangential velocities larger than about 250 km s -1 . All these objects are suspected to be in fact subdwarfs, if so, their distances would he only about half of our original estimates. The three most extreme objects in that respect are the K and early M dwarfs LP 323-168, LHS 5343 and LP 552-21 with corrected distances between 180 pc and 400 pc and resulting tangential velocities still larger than about 400 km s -1 .

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