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J/A+A/442/211    Spectroscopic distances of 322 NLTT stars       (Scholz+, 2005)

Search for nearby stars among proper motion stars selected by optical-to-infrared photometry. III. Spectroscopic distances of 322 NLTT stars. Scholz R.-D., Meusinger H., Jahreiss H. <Astron. Astrophys., 442, 211-227 (2005)> =2005A&A...442..211S
ADC_Keywords: Surveys ; Stars, nearby ; Stars, pre-main sequence ; MK spectral classification ; Stars, distances Keywords: techniques: spectroscopic - surveys - astrometry - stars: distances - stars: late-type - Solar neighbourhood Abstract: Distance estimates based on low-resolution spectroscopy and Two Micron All Sky Survey (2MASS, Cat. II/246) J magnitudes are presented for 322 nearby candidates from Luyten's NLTT catalogue (I/98). Mainly relatively bright (typically 7<Ks<11) and red high proper motion stars have been selected according to their 2MASS magnitudes and optical-to-infrared colours (+1<R-Ks<+7). Some LHS stars previously lacking spectroscopy have also been included. We have classified the majority of the objects as early-M dwarfs (M2-M5). More than 70% of our targets turned out to lie within the 25pc horizon of the catalogue of nearby stars, with 50 objects placed within 15pc and 8 objects being closer than 10pc. Three objects in the 10pc sample have no previously published spectral type: LP 876-10 (M4), LP 870-65 (M4.5), and LP 869-26 (M5). A large fraction of the objects in our sample (57%) ave independent distance estimates, mainly by the recent efforts of Reid and collaborators. Our distance determinations are generally in good agreement with theirs. 11 rather distant (d>100pc) objects have also been identified, including a probable halo, but relatively hot (Teff=13000K) white dwarf (LHS 1200) and 10 red dwarfs with extremely large tangential velocities (250<vt<1150km/s). Altogether, there are 11 red dwarfs (including one within 70pc) with tangential velocities larger than about 250km/s. All these objects are suspected to be in fact subdwarfs, if so, their distances would be 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 180pc and 400pc and resulting tangential velocities still larger than about 400km/s. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 104 322 Data of the 322 stars of the sample. notes.dat 80 85 Individual notes refs.dat 75 26 References
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/98 : NLTT Catalogue (Luyten, 1979) J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name NLTT, LHS, Giclas or Durchmusterung name 11 A1 --- n_Name [*] * indicates a note in notes.dat 13- 14 I2 h RAh Right Ascension J2000 (hours) (2MASS) 16- 17 I2 min RAm Right Ascension J2000 (minutes) (2MASS) 19- 23 F5.2 s RAs Right Ascension J2000 (seconds) (2MASS) 26 A1 --- DE- Declination J2000 (sign) (2MASS) 28- 29 I2 deg DEd Declination J2000 (degrees) (2MASS) 31- 32 I2 arcmin DEm Declination J2000 (minutes) (2MASS) 34- 37 F4.1 arcsec DEs Declination J2000 (seconds) (2MASS) 39- 46 F8.3 yr Epoch Epoch of position (2MASS) 48- 53 F6.3 mag Jmag ? J magnitude from 2MASS 55- 60 F6.3 mag Hmag ? H magnitude from 2MASS 62- 67 F6.3 mag Ksmag ? K_s magnitude from 2MASS 69- 71 A3 --- pSp Previous spectral type, G, K, M 72- 74 F3.1 --- pSpC ? Previous spectral sub-class (0.0-9.5) 76- 77 I2 --- r_pSpC ? Reference for pSp and pSpC 79- 83 F5.1 pc pDist ? Previous distance estimate 85- 86 I2 --- r_pDist ? Reference for previous distance estimate 88- 90 A3 --- SpT New spectral type, M, K,WD ,CWD 91- 93 F3.1 --- SpC ? New spectral sub-class (0.0-9.5) 95- 99 F5.1 pc Dist New distance estimate, accurate to ∼20% 101-104 I4 km/s Vt Tangential velocity
Table 3: Suspected subdwarfs with corrected distances and tangential velocities ------------------------------------------------------------------------------- Name SpTypecorr Distcorr Vtcorr ------------------------------------------------------------------------------- LP 552-21 sd: M0.5 348 567 LHS 5343 sd: K7.0 187 444 LHS 299 sd: M0.0 75 397 LP 323-168 sd: K2.0 398 394 LHS 2763 sd: M0.0 82 309 LHS 6124 sd: K7.0 121 252 LHS 6147 sd: K7.0 116 231 LHS 6385 sd: K5.0 61 136 LHS 2048 sd: M2.5 52 131 LHS 6356 sd: K5.0 63 127 LHS 3473 sd: M3.0 33 124 Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Name 11- 80 A70 --- Note Text of the note
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference code 4- 22 A19 --- BibCode BibCode 24- 42 A19 --- Aut Author's name 46- 75 A30 --- Com Comments
Acknowledgements: Ralf-Dieter Scholz, rdscholz(at)aip.de
(End) Patricia Vannier [CDS] 20-Oct-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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