J/AJ/125/1598 New high proper motion stars in the northern sky (Lepine+, 2003)
Spectroscopy of new high proper motion stars in the northern sky.
I. New nearby stars, new high-velocity stars, and an enhanced classification
scheme for M dwarfs.
Lepine S., Rich R.M., Shara M.M.
<Astron. J. 125, 1598 (2003)>
=2003AJ....125.1598L 2003AJ....125.1598L
ADC_Keywords: Stars, nearby ; Proper motions ; Photometry ; Radial velocities ;
Space velocities ; Spectroscopy
Keywords: solar neighborhood - stars: kinematics -
stars: low-mass, brown dwarfs - subdwarfs - white dwarfs
Abstract:
We define an enhanced spectral classification scheme for M dwarf stars
and use it to derive spectral classification of 104 northern stars
with proper motions larger than 0.5"/yr that we discovered in a survey
of high proper motion stars at low Galactic latitudes. The final tally
is as follows: 54 M dwarfs, 25 sdK and sdM subdwarfs, 14 esdK and esdM
extreme subdwarfs, and 11 DA and DC white dwarfs. Among the most
interesting cases, we find one star to be the coolest subdwarf ever
reported (LSR 2036+5059, with spectral type sdM7.5), a new M9.0 dwarf
only about 6 pc distant (LSR 1835+3259), and a new M6.5 dwarf only 7
pc from the Sun (LSR 2124+4003). Spectroscopic distances suggests that
27 of the M dwarfs, three of the white dwarfs, and one of the
subdwarfs (LSR 2036+5059) are within 25 pc of the Sun, making them
excellent candidates for inclusion in the solar neighborhood census.
Estimated sky-projected velocities suggest that most of our subdwarfs
and extreme subdwarfs have halo kinematics. We find that several white
dwarfs and nonmetal-poor M dwarfs also have kinematics consistent with
the halo, and we briefly discuss their possible origin.
Description:
Spectra were obtained on six separate runs, at the Lick Observatory in
2000 August, 2001 July, and 2001 December, at the MDM Observatory in
2001 February and 2002 May, and at the Kitt Peak National Observatory
in 2002 May (see Table 1). All 64 Lick spectra were obtained with the
KAST spectrograph, mounted at the Cassegrain focus of the 3-m Shane
Telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 104 Newly classified high proper motion stars
table3.dat 78 93 Measured spectral indices of observed M dwarfs,
subdwarfs, and extreme subdwarfs
table5.dat 67 107 Estimated distances and kinematics
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See also:
J/AJ/124/1190 : Northern high proper motion stars in DSS (Lepine+, 2002)
I/87 : LHS Catalogue, 2nd Edition (Luyten 1979)
I/279 : Revised Luyten Half-Second Catalogue (Bakos+ 2002)
I/98 : NLTT Catalogue (Luyten, 1979)
III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Star name
15- 19 F5.3 arcsec/yr pm Proper motion
21- 25 F5.1 deg PApm Proper-motion position angle
27- 30 F4.1 mag Bmag ? The photographic blue magnitude
32- 35 F4.1 mag Rmag The photographic red magnitude
37- 40 F4.1 mag Ksmag ? The Ks band magnitude
42- 51 A10 "YYYY/MM/DD" Obs Dat of observation
53 A1 --- OCode Observatory code (1)
55- 63 A9 --- SpType Spectral type (2)
65- 68 I4 km/s HRV ? Estimated heliocentric radial velocity
70- 71 I2 km/s e_HRV ? Uncertainty in HRV
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Note (1): Observatory code are defined as follows:
L = Lick 3 m Shane;
M = MDM 2.4 m Hiltner;
K = KPNO 4 m Mayall.
Note (2): Spectral class and subtype based on spectroscopy.
Parentheses indicate possible change in spectral class required
for consistency with the star's kinematics.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Star name
15- 19 F5.3 --- CaH1 CaH1 spectral index, Reid et al. (III/98)
21- 25 F5.3 --- CaH2 CaH2 spectral index, Reid et al. (III/98)
27- 31 F5.3 --- CaH3 CaH3 spectral index, Reid et al. (III/98)
33- 37 F5.3 --- TiO5 TiO5 spectral index, Reid et al. (III/98)
39- 43 F5.3 --- VO1 Hawley et al. 2002 VO1 spectral index
45- 49 F5.3 --- TiO6 The TiO6 spectral index (1)
51- 55 F5.3 --- VO2 The VO2 spectral index (1)
57- 61 F5.3 --- TiO7 TiO7 spectral index,
Hawley et al. (J/AJ/123/3409)
63- 68 F6.3 --- C-M The Color-M spectral index (1)
70- 78 A9 --- SpType Spectral type
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Note (1): Spectral type indices for M dwarfs and subdwarfs (Table 2):
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Index Numerator Denominator Other name Ref.
name
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CaH1 6380-6390 Average of 6410-6420 and 6345-6355 1
CaH2 6814-6846 7042-7046 1
CaH3 6960-6990 7042-7046 1
TiO5 7126-7135 7042-7046 1
VO1 7430-7470 7550-7570 VO 7434 2
TiO6 7550-7570 7745-7765 3
VO2 7920-7960 8130-8150 3
TiO7 8440-8470 8400-8420 TiO 8440 2
C-M 8105-8155 6510-6560 3
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References:
1 = Reid et al, 1995AJ....110.1838R 1995AJ....110.1838R, Cat. III/198
2 = Hawley et al., 2002, Cat. J/AJ/123/3409
3 = this paper
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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- 13 A13 --- Name Star name
15- 23 A9 --- SpType Spectral type (1)
25- 27 I3 pc Dist Spectroscopic distance estimate
29- 31 I3 pc e_Dist Uncertainty in Dist
33 A1 --- f_Dist [m] Dist based on spectral type in parentheses
35- 38 I4 km/s Uvel Velocity toward the Galactic center relative
to the LSR (2)
40- 42 I3 km/s e_Uvel Uncertainty in Uvel
44 A1 --- f_Uvel [m] Uvel based on spectral type in parentheses
46- 50 I5 km/s Vvel Velocity in the direction of Galactic rotation
relative to the LSR (2)
52- 54 I3 km/s e_Vvel Uncertainty in Vvel
56 A1 --- f_Vvel [m] Vvel based on spectral type in parentheses
58- 61 I4 km/s Wvel Velocity toward the north Galactic pole
relative to the LSR (2)
63- 65 I3 km/s e_Wvel Uncertainty in Wvel
67 A1 --- f_Wvel [m] Wvel based on spectral type in parentheses
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Note (1): Spectral class and subtype based on spectroscopy. Parentheses
indicate a possible change in spectral class that would lower the
star's components of velocity to more consistent values.
Note (2): Calculated from the radial velocities, proper motions, and
estimated distances.
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History:
From electronic version of the journal
* 24-Jun-2005: in order to be consistent with the previous publication
(J/AJ/124/1190), LSR names were corrected:
- table1+5: LSR0803+1547 into LSR0803+1548 to
- table3 : LSR1833+2219 (B removed)
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 29-Apr-2003