J/AJ/159/30 High proper-motion M-type stars spectroscopic obs. (Hejazi+, 2020)
Chemical properties of the local galactic disk and halo.
I. Fundamental properties of 1544 nearby, high proper-motion M dwarfs and
subdwarfs.
Hejazi N., Lepine S., Homeier D., Michael Rich R., Shara M.M.
<Astron. J., 159, 30 (2020)>
=2020AJ....159...30H 2020AJ....159...30H
ADC_Keywords: Stars, M-type; Abundances; Spectral types; Effective temperatures;
Spectra, optical; Proper motions; Photometry, infrared;
Stars, dwarfs; Stars, subdwarf
Keywords: M dwarf stars
Abstract:
Large numbers of low-to-medium-resolution spectra of M-type dwarf
stars from both the local Galactic disk and halo are available from
various surveys. In order to fully exploit these data, we develop a
template-fit method using a set of empirically assembled M dwarf/subdwarf
classification templates, based on the measurements of the TiO and CaH
molecular bands near 7000Å, which are used to classify
M dwarfs/subdwarfs by spectral type and metallicity class. We further
present a pipeline to automatically determine the effective
temperature Teff, metallicity [M/H], α-element to iron abundance
ratio [α/Fe], and surface gravity logg of M dwarfs/subdwarfs
using the latest version of BT-Settl model atmospheres. We apply these
methods to a set of low-to-medium-resolution spectra of 1544 high
proper-motion (µ≥0.4"/yr) M dwarfs/subdwarfs, collected at the MDM
observatory, Lick Observatory, Kitt-Peak National Observatory, and
Cerro-Tololo Interamerican Observatory.
Description:
Stars with proper motions µ>40mas/yr identified in the SUPERBLINK
survey and published in the LSPM-north catalog of
Lepine & Shara (2005, I/298) were selected for follow-up observations
as part of a long-term, stellar spectroscopy program.
Our search for M dwarf and M subdwarf stars has mainly focused on the
subset of 2290 stars with red optical to infrared colors (V-J>2.5) and
especially a subset of 1746 stars that are formally identified as
late-K and M dwarfs/subdwarfs. These were observed in multiple
observing runs at the Michigan-Dartmouth-MIT (MDM) observatory, the
Kitt-Peak National Observatory (KPNO), and the Lick Observatory. In
the course of the program, a few high proper-motion stars of interest
that were identified in the southern sky were included in the survey,
and observed in two observing runs at the Cerro-Tololo Interamerican
Observatory (CTIO).
Spectroscopic observations at the MDM observatory were conducted
between 2002-2012 with the McGraw-Hill 1.3m and the Hiltner 2.4m
telescopes (R∼2000 with grating 300lines/mm; R∼4000 with grating
600lines/mm).
The KPNO/CTIO observations were completed with the Mayall/Blanco 4m
telescopes between 2002-2009 (R∼2000 with grating 316lines/mm; R∼4000
with grating 600lines/mm).
Finally, the Lick Observatory observations were made with the KAST
spectrograph on the Shane 3m telescope on 2002-2004 (R∼4000 with
grating 600lines/mm).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 93 1700 Spectroscopic catalog of the 1700 stars in our
survey: observational facilities, astrometry, and
kinematics
table4.dat 66 1699 Spectroscopic catalog of the 1700 stars in our
survey: classification and photometry
table8.dat 62 1543 *Spectroscopic catalog of the 1544 stars in our
survey: stellar parameters derived from BT-Settl
model fit
table9.dat 97 48 Classification and chemical parameters of the 48
common proper-motion pairs
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Note on table8.dat: We employ the latest version of BT-Settl model atmospheres
(Allard+ 2012RSPTA.370.2765A 2012RSPTA.370.2765A ; 2012EAS....57....3A 2012EAS....57....3A ; 2013MSAIS..24..128A 2013MSAIS..24..128A
and Baraffe+ 2015A&A...577A..42B 2015A&A...577A..42B).
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See also:
III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/298 : LSPM-North Catalog (Lepine+ 2005)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VI/119 : High accuracy computed water line list - BT2 (Barber+, 2006)
J/AJ/113/806 : M-Subdwarfs (Gizis 1997)
J/AJ/125/1598 : New high PM stars in the northern sky (Lepine+, 2003)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)
J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)
J/PASP/121/117 : Fe & Ti abundances 12 low-metallicity M stars (Woolf+, 2009)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/AJ/141/90 : SEGUE stellar parameter pipeline. V. (Lee+, 2011)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011)
J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)
J/A+A/542/A33 : 3 M dwarfs near-infrared spectra (Onehag+, 2012)
J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)
J/ApJ/767/95 : Stellar parameters smallest KIC stars (Dressing+, 2013)
J/AJ/145/102 : Spectroscopy of M dwarfs in the northern sky (Lepine+, 2013)
J/A+A/554/A84 : Abundances of evolved stars (Maldonado+, 2013)
J/AJ/145/52 : Abundances late K & M dwarfs in binary systems (Mann+, 2013)
J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)
J/AJ/147/20 : Spectroscopy of 447 nearby M dwarfs (Newton+, 2014)
J/A+A/564/A90 : M subdwarfs VLT/UVES high R spectra (Rajpurohit+, 2014)
J/A+A/562/A71 : Chemical abundance solar neighbourhood dwarfs (Bensby+,2014)
J/ApJ/814/130 : Planet occurrence rates calculated for KOIs (Mulders+, 2015)
J/AJ/150/42 : Catalog of 2612 M dwarfs from LAMOST (Zhong+, 2015)
J/MNRAS/457/2877 : Kepler M dwarf stars revised properties (Gaidos+, 2016)
J/MNRAS/456/3655 : Masses and ages of red giants (Martig+, 2016)
J/ApJ/851/26 : Teff, metallicity & Ti abundance of M dwarfs (Veyette+,2017)
J/A+A/620/A180 : Stellar properties of M dwarfs (Rajpurohit+, 2018)
J/AJ/157/63 : Rad. relations low-metallicity M-dwarf stars (Kesseli+,2019)
J/A+A/628/A61 : X-shooter spectra of 43 metal-poor M dwarfs (Lodieu+, 2019)
J/A+A/624/A78 : Masses and ages of 1059 HARPS-GTO stars (Delgado Mena+,2019)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PM_]
4- 16 A13 --- PM Object designation (IHHMMm+DDMMWw)
18- 27 A10 "date" Date UT date of the observation
29- 35 A7 --- Obs Observatory identifier (1)
37- 49 A13 --- Inst Spectrograph identifier
51- 59 F9.5 deg RAdeg Right ascension (J2000) (2)
61- 69 F9.5 deg DEdeg [-76/88] Declination (J2000) (2)
71- 77 F7.4 arcsec/yr pmRA [-4.5/2.9] Proper motion along RA (2)
79- 85 F7.4 arcsec/yr pmDE [-4.8/11] Proper motion along DE (2)
87- 93 F7.5 arcsec plx [0.003/0.34]? Parallax (2)
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Note (1): Observatory as follows:
MDM = Michigan-Dartmouth-MIT observatory; McGraw-Hill 1.3m and
Hiltner 2.4m telescopes (1457 occurrences)
Lick = Lick observatory; Shane 3m telescope (114 occurrences)
KPNO = Kitt-Peak National Observatory; Mayall 4m telescope
CTIO = Cerro-Tololo Interamerican Observatory; Blanco 4m telescope
Note (2): From Gaia DR2 except for stars with no parallax listed, Ep=2015.5.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PM_]
4- 16 A13 --- PM Object designation (IHHMMm+DDMMWw)
18- 24 A7 --- SpT Spectral type
26- 27 I2 --- MClass [1/12] Metallicity class (3)
29 A1 --- f_PM [n] n: no match with Gaia DR2
30- 34 F5.2 mag Gmag [6.9/19.5]? Gaia DR2 G band magnitude
37- 41 F5.2 mag BPmag [7.7/21]? Gaia DR2 blue band magnitude
44- 48 F5.2 mag RPmag [6.06/18]? Gaia DR2 red band magnitude
50- 54 F5.2 mag Jmag [4.3/17]?=99.9 2MASS J band magnitude
56- 60 F5.2 mag Hmag [3.7/28]?=99.9 2MASS H band magnitude
62- 66 F5.2 mag Ksmag [3.5/16]?=99.9 2MASS Ks band magnitude
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Note (3): Metallicity classes from 1 to 12, including 1380 metal-rich
M dwarf ("dM"; 1<MC<3), 139 moderately metal-poor M subdwarfs ("sdM";
4<MC<6), 140 extreme metal-poor M subdwarfs ("esdM"; 7<MC<9), and 41
ultra metal-poor M subdwarfs ("usdM"; 10<MC<12) stars.
See sections 3 and 4 for further explanations.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PM_]
4- 16 A13 --- PM Object designation (IHHMMm+DDMMWw)
18- 21 I4 K Teff [2850/4000] Effective temperature
23- 28 F6.2 K e_Teff [25/164] Uncertainty in Teff
30- 34 F5.2 [Sun] [M/H] [-2.45/0.45] Metallicity
36- 39 F4.2 [Sun] e_[M/H] [0.05/0.27] Uncertainty in [M/H]
41- 46 F6.3 [Sun] [a/Fe] [-0.1/0.58] log α/Fe abundance ratio
48- 53 F6.4 [Sun] e_[a/Fe] [0.03/0.17] Uncertainty in [a/Fe]
55- 57 F3.1 [cm/s2] logg [4.8/5.2] log surface gravity
59- 62 F4.2 [cm/s2] e_logg [0/0.15] Uncertainty in logg
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [PM]
4- 15 A12 --- PM-c Companion identifier (IHHMMm+DDMMW)
17- 20 A4 --- SpT-c Companion spectral type
22 I1 --- MClass-c [1/8] Companion metallicity class (1)
24- 28 F5.2 [Sun] [M/H]-c [-1.35/0.45] Companion metallicity
30- 33 F4.2 [Sun] e_[M/H]-c [0.05/0.15] Error on [M/H]-c
35- 41 F7.4 [Sun] [a/Fe]-c [0.025/0.35] Companion α/Fe abundance
ratio
43- 48 F6.4 [Sun] e_[a/Fe]-c [0.04/0.15] Error on [a/Fe]-c
50- 51 A2 --- --- [PM]
53- 64 A12 --- PM-p Primary star identifier (IHHMMm+DDMMW)
66- 69 A4 --- SpT-p Primary star spectral type
71 I1 --- MClass-p [1/7] Primary star metallicity class (1)
73- 77 F5.2 [Sun] [M/H]-p [-1.3/0.45] Primary star metallicity
79- 82 F4.2 [Sun] e_[M/H]-p [0.05/0.22] Error on [M/H]-p
84- 90 F7.4 [Sun] [a/Fe]-p [-0.03/0.33] Primary star α/Fe
abundance ratio
92- 97 F6.4 [Sun] e_[a/Fe]-p [0.04/0.15] Error on [a/Fe]-p
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Note (1): Metallicity classes (as in Table 4) from 1 to 8, including:
43 dM (1<MC<3), 3 sdM (4<MC<6) and 2 esdM (7<MC<8) for the companions and
42 dM (1<MC<3), 4 sdM (4<MC<6) and 1 esdM (MC=7) for the primary stars.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 01-Apr-2020