J/ApJ/927/122 Chemical properties of the local disk & halo. II. (Hejazi+, 2022)
Chemical properties of the local disk and halo.
II. Abundances of 3745 M dwarfs and subdwarfs from improved model fitting of
low-resolution spectra.
Hejazi N., Lepine S., Nordlander T.
<Astrophys. J., 927, 122 (2022)>
=2022ApJ...927..122H 2022ApJ...927..122H
ADC_Keywords: Stars, M-type; Spectra, optical; Abundances;
Parallaxes, trigonometric; Photometry, infrared;
Stars, dwarfs; Stars, subdwarf
Keywords: M dwarf stars
Abstract:
We present a model-fit pipeline to determine the stellar parameters of
M-type dwarfs, which is an improvement on our previous work described
in Hejazi+ (Paper I; J/AJ/159/30). We apply this pipeline to analyze
the low-resolution (R∼2000) spectra of 3745 M dwarfs/subdwarfs,
collected at the MDM Observatory, Lick Observatory, Kitt Peak National
Observatory, and Cerro Tololo Inter-American Observatory. We examine
the variation of the inferred parameter values in the H-R diagram
constructed from their Gaia Early Data Release 3 (EDR3) parallaxes and
optical magnitudes. We also study the distribution of our stars in the
abundance diagram of [α/Fe] versus [M/H] and inspect the
variation of their metallicity class, effective temperature, and
surface gravity, as well as their Galactic velocity components U, V,
and W, in this diagram. In addition, the analyses of the stars'
projected motions in the two-dimensional UV, VW, and UW planes, the
variation of their chemical parameters in these planes, and their
distribution in the abundance-velocity diagrams are important parts of
this study. The precision of our model-fit pipeline is confirmed by
the clear stratification of effective temperature and chemical
parameters in the H-R diagram; the similarity of the stars'
distribution in the [α/Fe] versus [M/H] diagram and in the
metallicity-velocity planes to those from other studies; the revealing
of substructure in the abundance-velocity diagrams; and chemical
homogeneity between the components of a set of binary systems.
Description:
Our data set consists of spectra from 3745 M dwarfs/subdwarfs
collected between 2002 and 2012 in multiple observing runs at the MDM
observatory, the Kitt Peak National Observatory (KPNO), the Lick
Observatory, and the Cerro Tololo Inter-American Observatory. A
summary of the observations and data reduction is presented in Paper I
(Hejazi+ 2020, J/AJ/159/30).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 3745 Spectroscopic catalog of the 3745 stars:
astrometry and kinematics
table2.dat 63 3745 Spectroscopic catalog of the 3745 stars:
classification and photometry
table4.dat 93 3745 Spectroscopic catalog of the 3745 stars:
model-fit stellar parameters
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See also:
I/298 : LSPM-North Catalog (Lepine+ 2005)
V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/MNRAS/325/1365 : Solar neighbourhood metallicity distrib. (Haywood+, 2001)
J/AJ/130/1680 : LSPM-North proper-motion cat. nearby stars (Lepine+, 2005)
J/AJ/141/90 : SEGUE stellar parameter pipeline. V. (Lee+, 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/AJ/145/102 : Spec. of bright M dwarfs in the northern sky (Lepine+, 2013)
J/AJ/145/52 : Abund. of late K & M dwarfs in binary systems (Mann+, 2013)
J/A+A/564/A90 : M subdwarfs VLT/UVES high resolution sp. (Rajpurohit+, 2014)
J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)
J/ApJ/851/26 : Teff, metallicity & Ti abund. of M dwarfs (Veyette+, 2017)
J/A+A/615/A6 : Photospheric parameters of CARMENES stars (Passegger+, 2018)
J/A+A/620/A180 : Stellar properties of M dwarfs (Rajpurohit+, 2018)
J/AJ/157/63 : Radii for low-metallicity M-dwarf stars (Kesseli+, 2019)
J/ApJ/878/134 : HARPS & X-shooter sp. of Southern M dwarfs (Kuznetsov+ 2019)
J/ApJ/871/63 : How to constrain your M dwarf. II. Binaries (Mann+, 2019)
J/MNRAS/482/5302 : GALAH co-orbiting stars & chemical tagging (Simpson+, 2019)
J/MNRAS/492/1164 : Abundances of Gaia DR2 wide binaries (Hawkins+, 2020)
J/AJ/159/30 : High PM M-type stars spectroscopic obs. (Hejazi+, 2020)
J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/A+A/657/A7 : Stellar companions from Gaia EDR3 (Kervella+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PM_]
4- 16 A13 --- PM Object identifier (IHHMMm+DDMMWw)
18- 26 F9.5 deg RAdeg Right Ascension (ICRS) at Ep=2015.5
28- 36 F9.5 deg DEdeg Declination (ICRS) at Ep=2015.5
38- 44 F7.4 arcsec/yr pmRA [-3/3] Proper motion along RA
46- 52 F7.4 arcsec/yr pmDE [-2.4/2] Proper motion along DE
54- 60 F7.5 arcsec plx [0.0018/0.4] Parallax
62- 64 A3 --- DR Gaia catalog DR flag (1)
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Note (1): Gaia catalog as follows:
DR3 = Gaia EDR3 catalog (3545 occurrences)
DR2 = Gaia DR2 catalog (200 occurrences)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [PM_]
4- 16 A13 --- PM Object identifier (IHHMMm+DDMMWw)
18- 24 A7 --- SpT Spectral type
26- 27 I2 --- MC [1/12] Metallicity class (2)
29- 33 F5.2 mag Gmag [7.2/19] Gaia G passband magnitude (3)
35- 39 F5.2 mag Bpmag [8.3/20.6] Gaia blue passband magnitude (3)
41- 45 F5.2 mag Rpmag [6.17/17.8] Gaia red passband magnitude (3)
47- 51 F5.2 mag Jmag [5.18/16] 2MASS J band magnitude
53- 57 F5.2 mag Hmag [4.48/15.4] 2MASS H band magnitude
59- 63 F5.2 mag Ksmag [4/15] 2MASS Ks band magnitude
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Note (2): Metallicity classes from 1 to 12, including 3388 metal-rich M dwarf
("dM"; 1<MC≤3), 234 moderately metal-poor M subdwarfs ("sdM"; 4≤MC≤6),
101 extreme metal-poor M subdwarfs ("esdM"; 7≤MC≤9), and 22 ultra
metal-poor M subdwarfs ("usdM"; 10≤MC≤12) stars.
Note (3): For 3545 sources, the Gaia data is from EDR3 while the remaining are
from DR2. See the "DR" column.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [PM_]
4- 16 A13 --- PM Object identifier (IHHMMm+DDMMWw)
18- 21 I4 K Teff-N [2800/4000] Effective temperature from
normal method
23- 27 F5.1 K e_Teff-N [0/157] Uncertainty in Teff-N
29- 33 F5.2 [-] [M/H]-N [-2.5/0.5] Overall metallicity from normal
method
35- 38 F4.2 [-] e_[M/H]-N [0.09/0.3] Uncertainty in [M/H]-N
40- 45 F6.3 [-] [a/Fe]-N [-0.15/0.6] Alpha-element/Fe abundance
ratio from normal method
47- 51 F5.3 [-] e_[a/Fe]-N [0.04/0.2] Uncertainty in [a/Fe]-N
53- 58 F6.1 K Teff-RC [2800/4000] Effective temperature from
reduced-correlation method
60- 64 F5.1 K e_Teff-RC [0/267] Uncertainty in Teff-RC
66- 70 F5.2 [-] [M/H]-RC [-2.5/0.5] Overall metallicity from
reduced-correlation method
72- 75 F4.2 [-] e_[M/H]-RC [0/0.8] Uncertainty in [M/H]-RC
77- 82 F6.3 [-] [a/Fe]-RC [-0.17/0.6] Alpha-element/Fe abundance
ratio from reduced-correlation method
84- 88 F5.3 [-] e_[a/Fe]-RC [0/0.5] Uncertainty in [a/Fe]-RC
90- 93 F4.2 [cm/s2] log(g) [4.5/5.3] Log photometric surface gravity
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History:
From electronic version of the journal
References:
Hejazi et al. Paper I. 2020AJ....159...30H 2020AJ....159...30H Cat. J/AJ/159/30
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Jan-2024