J/MNRAS/373/705 Optical spectroscopy of high proper motion stars (Reyle+, 2006)
Optical spectroscopy of high proper motion stars: new M dwarfs within 10pc and the closest pair of subdwarfs. Reyle C., Scholz R.D., Schultheis M., Robin A.C., Irwin M. <Mon. Not. R. Astron. Soc. 373, 705 (2006)> =2006MNRAS.373..705R
ADC_Keywords: Stars, nearby ; Stars, dwarfs ; Spectroscopy Keywords: stars: late-type - subdwarfs - white dwarfs - solar neighbourhood Abstract: We present spectra of 59 nearby star candidates, M dwarfs and white dwarfs, previously identified using high proper motion catalogues and the DENIS database. We review the existing spectral classification schemes and spectroscopic parallax calibrations in the near-infrared J band and derive spectral types and distances of the nearby candidates. Forty-two stars have spectroscopic distances smaller than 25pc, three of them being white dwarfs. Two targets lie within 10pc, one M8 star at 10.0pc (APMPM J0103-3738), and one M4 star at 8.3pc (L 225-57). One star, LHS 73, is found to be among the few subdwarfs lying within 20pc. Furthermore, together with LHS 72, it probably belongs to the closest pair of subdwarfs we know. Description: Spectroscopic parameters (spectral indices, spectral type, spectroscopic distances) for 56 nearby M dwarfs and one K subdwarf are presented. Proper motion, optical and near infrared photometry, and photometric distance can be found in Reyle & Robin, 2004, Cat. J/A+A/421/643 and Reyle et al., 2002, Cat. J/A+A/390/491. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 97 22 Nearby APM star candidates observed at the ESO/NTT table3.dat 97 37 Nearby stars candidates found in the LEHPMS (Liverpool-Edinburgh high proper motion survey) observed at the ESO/NTT table5.dat 147 56 Spectroscopic indices, spectral type, absolute magnitude MJ and spectroscopic distance of the red dwarf candidates observed at NTT.
See also: J/A+A/421/643 : New nearby stars in the LEHPMS (Reyle+, 2004) J/A+A/390/491 : DENIS new nearby stars (Reyle+, 2002) Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Name Name of the star 18 A1 --- n_Name [abc] Note on distance estimation (1) 20- 21 I2 h RAh Right ascension (J2000, at Epoch) 23- 24 I2 min RAm Right ascension (J2000, at Epoch) 26- 30 F5.2 s RAs Right ascension (J2000, at Epoch) 32 A1 --- DE- Declination sign (J2000, at Epoch) 33- 34 I2 deg DEd Declination sign (J2000, at Epoch) 36- 37 I2 arcmin DEm Declination (J2000, at Epoch) 39- 42 F4.1 arcsec DEs Declination (J2000, at Epoch) 44- 49 F6.1 yr Epoch Epoch of observation at ESO/NTT 51- 55 F5.2 arcsec/yr pmRA Proper motion along RA direction 57- 61 F5.2 arcsec/yr pmDE Proper motion along Declination 63- 67 F5.2 mag Bjmag Bj magnitude (2) 69- 73 F5.2 mag Rmag R magnitude (2) 75- 79 F5.2 mag Imag DENIS I magnitude 80 A1 --- n_Imag [J] J if Jmag in Imag 81- 85 F5.2 mag I-J Denis I-J colour index 86 A1 --- n_I-J [J] J if J-Ks in I-J 88- 92 F5.1 pc dphot ?=- Photometric distance 93 A1 --- --- [/] 94- 97 F4.1 pc dphot2 ? Second photometric distance estimate (3)
Note (1): Notes as follows: a = White dwarf candidates. The photometric distance has been computed with (J, I-J) theoretical relation from Bergeron et al. (1995PASP..107.1047B) for 0.6M☉ white dwarfs. No distances were determined for the bluest candidates as they are beyond the colour limit of the theoretical relation. b = Subdwarf candidate. The photometric distance has been obtained using the (J, I-J) theoretical relation from Baraffe et al. (1998, Cat. J/A+A/337/403) with a metallicity of 1.8dex. c = drop-out star. The DENIS magnitude is in the J band, the colour is J-Ks. The photometric distance has been computed using the (J, J-Ks) theoretical relation from Baraffe et al. (1998, Cat. J/A+A/337/403). Note (2): Bj and R magnitude are from APM high proper motion catalogue in table2 and from LEHPMS (Cat. J/A+A/421/643) high proper motion catalogue in table3. Note (3): Photometric distance estimate assuming that the star belongs to the disc/to the thick disc, obtained using the (J, I-J) theoretical relation from Baraffe et al. (1998, Cat. J/A+A/337/403) with a metallicity of 0/0.8dex (see Reyle et al., 2002, Cat. J/A+A/390/491).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Name Name of the star 22- 23 I2 h RAh Right ascension (J2000.0) 25- 26 I2 min RAm Right ascension (J2000.0) 28- 32 F5.2 s RAs Right ascension (J2000.0) 34 A1 --- DE- Declination sign (J2000.0) 35- 36 I2 deg DEd Declination (J2000.0) 38- 39 I2 arcmin DEm Declination (J2000.0) 41- 44 F4.1 arcsec DEs Declination (J2000.0) 46- 50 F5.3 --- TiO5 Spectral index TiO5 52- 56 F5.3 --- CaH1 Spectral index CaH1 58- 62 F5.3 --- CaH2 Spectral index CaH2 64- 68 F5.3 --- CaH3 Spectral index CaH3 70- 74 F5.3 --- PC3 Spectral index PC3 76- 80 A5 --- SpType MK spectral type (1) 82- 86 F5.2 mag Jmag DENIS J magnitude 88- 92 F5.2 mag JMAG Absolute J magnitude 94- 97 F4.1 pc Dist Spectroscopic distance 99-102 F4.1 pc e_Dist ? Error on spectroscopic distance 104-147 A44 --- Comment Comments
Note (1): The additional letter "e" in the spectral type indicates a star showing Halpha emission.
Acknowledgements: Celine Reyle, celine.reyle-laffont(at)univ-fcomte.fr History: * 24-Nov-2006: Original version * 05-Dec-2007: Tables 2 and 3 added; corrections at CDS - table3: names "LHS 1249" changed into "LHS 1243"; and "LEHPMS J0030-5442" into its synonym "L 170-14A". several names of table 5 corrected - table5: many names changed to be compatible with tables 2 and 3, mainly inconsistencies between L, LP and NLTT acronyms.
(End) Celine Reyle [Besancon Obs., France], Patricia Vannier [CDS] 24-Nov-2006
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