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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 97 22 Nearby APM star candidates observed at the ESO/NTT
table3.dat 92 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.
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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[23].dat
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Bytes Format Units Label Explanations
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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)
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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 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).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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
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Note (1): The additional letter "e" in the spectral type indicates a star
showing Halpha emission.
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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