J/A+A/660/A131 99 low-mass stars in Gaia EDR3 CNS (Mejias+, 2022)
VVVX near-IR photometry for 99 low-mass stars in the Gaia EDR3 Catalogue of
Nearby Stars.
Mejias A., Minniti D., Alonso-Garcia J., Beamin J.C, Saito R.K., Solano E.
<Astron. Astrophys. 660, A131 (2022)>
=2022A&A...660A.131M 2022A&A...660A.131M (SIMBAD/NED BibCode)
ADC_Keywords: Regional catalog ; Galactic plane ; Stars, nearby ; Stars, M-type
Keywords: Galaxy: disk - solar neighborhood - low-mass stars -
stars: fundamental parameters - virtual observatory tools
Abstract:
Red dwarf stars represent 75% of stars in the Milky Way, and can be
studied in great detail in the solar neighborhood where the sample is
more complete. We intend to better characterize red-dwarf candidates
selected from the Gaia Catalog of Nearby Stars using optical and
near-infrared multi-filter photometry from VVVX, DECaPS, Pan-STARRS
and WISE surveys. We performed a cross-match between the positions of
a color-selected sample of M dwarfs in the VVVX Survey and the Gaia
Early Data Release 3 sub-catalog of nearby stars. We then explored
their stellar parameters comparing the spectral energy distribution
of each object with the BT-Settl CIFIST theoretical models using the
Virtual Observatory SED Analyzer (VOSA), and adopting a solar
metallicity value, we obtained effective temperatures and logg. Radii
were also obtained from the computed luminosities and Teff using the
Stefan-Boltzmann equation. Masses and ages were computed for some of
the objects ising evolutionary tracks and isochrones. Additional mass
estimations were obtained with the MKs-M* relation. Spectral types
were computed with VOSA fitting empirical spectral libraries. We then
validated the spectral types and effective temperatures of two of our
objects with spectra obtained with TSPEC/SOAR, and of our total amount
of stars through a direct comparison with an independent sample from
literature. We revised the objects in our sample and compared their
proper motion vectors with other sources within 30" to identify
possible companions and probed their Re-normalised Unit Weight Error
(RUWE) values to identify unresolved companions. We present a catalog
with physical parameters for 99 low-mass objects with distances from
43.2 to 111.3pc. Effective temperatures range from 2500 to 3400K, with
the majority of stars in the sample compatible with being M4 dwarfs.
We obtained good agreement between the stellar parameters computed
with VOSA and the estimations from observed spectra, and also when
comparing with an independent sample from the literature. Distribution
of masses obtained with VOSA is concentrated toward the very-low mass
regime. Eight objects present values of RUWE≥1.4, and seven are
consistent with being in binary systems.
Description:
Optical, near infrared, and infrared photometry for 99 low-mass
objects identified in the VVVX Survey that are also included in the
Gaia EDR3 Catalog of Nearby Stars. Additional astrometric information
is also reported together with their physical characterization.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 99 Astrometric information for 99 low-mass stars
table2.dat 139 99 Optical photometry for 99 low-mass stars
table3.dat 84 99 Near-IR and IR photometry for 99 low-mass stars
table4.dat 182 99 Stellar parameters for 99 low-mass stars
table5.dat 108 5 Positions and Gaia photometry for co-moving
objects not included in the low-mass stars sample
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars - GCNS (Gaia collaboration, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaEDR3 Gaia EDR3 identification
21- 38 F18.14 deg RAdeg Right ascension (J2000)
40- 58 F19.15 deg DEdeg Declination (J2000)
60- 66 F7.4 mas Plx Parallax
68- 73 F6.4 mas e_Plx Parallax error
75- 81 F7.3 mas/yr pmRA Proper motion along RA, pmRA*cosDE
83- 87 F5.3 mas/yr e_pmRA Error on Proper motion along RA
89- 95 F7.3 mas/yr pmDE Proper motion along DE
97-101 F5.3 mas/yr e_pmDE Error on Proper motion along DE
103-107 F5.3 --- RUWE Re-normalised Unit-Weight Error
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaEDR3 Gaia EDR3 identification
21- 26 F6.3 mag Gmag Gaia G magnitude
28- 33 F6.4 mag e_Gmag ? Error in Gaia G magnitude
35- 41 F7.4 mag BPmag ? Gaia BP magnitude
43- 48 F6.4 mag e_BPmag ? Error in Gaia BP magnitude
50- 55 F6.3 mag RPmag ? Gaia RP magnitude
57- 63 F7.5 mag e_RPmag ? Error in Gaia RP magnitude
65- 70 F6.3 mag gmag DECaPS g magnitude
72- 79 F8.6 mag e_gmag ? Error in DECaPS g magnitude
81- 87 F7.4 mag rmag DECaPS r magnitude
89- 94 F6.4 mag e_rmag ? Error in DECaPS r magnitude
96-102 F7.4 mag imag DECaPS i magnitude
104-109 F6.4 mag e_imag ? Error in DECaPS i magnitude
111-117 F7.4 mag zmag DECaPS z magnitude
119-124 E6.4 mag e_zmag ? Error in DECaPS z magnitude
126-132 F7.4 mag Ymag DECaPS Y magnitude
134-139 F6.4 mag e_Ymag ? Error in DECaPS Y magnitude
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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- 19 I19 --- GaiaEDR3 Gaia EDR3 identification
21- 26 F6.3 mag Jmag VVVX J magnitude
28- 32 F5.3 mag e_Jmag Error in VVVX J magnitude
34- 39 F6.3 mag Hmag VVVX H magnitude
41- 45 F5.3 mag e_Hmag Error in VVVX H magnitude
47- 52 F6.3 mag Ksmag VVVX Ks magnitude
54- 58 F5.3 mag e_Ksmag Error in VVVX Ks magnitude
60- 65 F6.3 mag W1mag ? WISE W1 magnitude
67- 71 F5.3 mag e_W1mag ? Error in WISE W1 magnitude
73- 78 F6.3 mag W2mag ? WISE W2 magnitude
80- 84 F5.3 mag e_W2mag ? Error in WISE W2 magnitude
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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- 19 I19 --- GaiaEDR3 Gaia EDR3 identification
21- 27 F7.3 pc Dist Distance
29- 34 F6.3 pc e_Dist Error in distance
36- 41 F6.1 K Teff Effective temperature
43- 49 F7.3 K e_Teff Error in effective temperature
51- 53 F3.1 [-] [Fe/H] Metallicity
55- 57 F3.1 [cm/s2] logg log of surface gravity
59- 63 F5.3 [cm/s2] e_logg Error in log of surface gravity
65- 68 A4 --- SpType MK spectral type
70- 75 F6.4 arcsec Rad Radius
77- 82 F6.4 arcsec e_Rad Error in radius
84- 88 F5.3 Msun Mass ? Mass
90- 94 F5.3 Msun BMass ? Upper limit of mass
96-101 F6.4 Msun bMass ? Lower limit of mass
103-107 F5.3 Msun MassMann ? Mass from Mass-Luminosity relation
(Mann et al., 2019ApJ...871...63M 2019ApJ...871...63M)
109-113 F5.3 Msun e_MassMann ? Error in mass from Mass-Luminosity
relation
115-119 F5.3 yr Age ? Age
121-125 F5.3 yr BAge ? Upper limit in age
127-131 F5.3 yr bAge ? Lower limit in age
133-138 A6 --- Flag Flag (1)
140-182 A43 --- Ref Additional refereces for the source (2)
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Note (1): Flag as follows:
BD = Brown dwarf
BD? = Brown dwarf ?
BIN = Candidate for Binary system
HR = RUWE ≥ 1.4
Note (2): References as follows:
Reyle(2018) = Reyle et al., 2018A&A...619L...8R 2018A&A...619L...8R.
Cat. J/A+A/619/L8
Hartman & Lepine(2020) = Hartman & Lepine, 2020ApJS..247...66H 2020ApJS..247...66H,
Cat. J/A=JS/246/66
Tian et al.(2020) = Tian et al., 2020ApJS..246....4T 2020ApJS..246....4T,
Cat. J/ApJS/246/4
Mugrauer & Michel (2020) = Mugrauer & Michel, 2020AN....341..996M 2020AN....341..996M,
Cat. J/AN/341/996
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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- 19 I19 --- GaiaEDR3 Gaia EDR3 identification
21- 35 F15.11 deg RAdeg Right ascension (J2000)
37- 51 F15.11 deg DEdeg Declination (J2000)
53- 61 F9.6 mag Gmag Gaia G magnitude
63- 70 F8.6 mag e_Gmag Error on Gaia G magnitude
72- 80 F9.6 mag BPmag ? Gaia BP magnitude
82- 89 F8.6 mag e_BPmag ? Error on Gaia BP magnitude
91- 99 F9.6 mag RPmag ? Gaia RP magnitude
101-108 F8.6 mag e_RPmag ? Error on Gaia RP magnitude
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Acknowledgements:
Andrea Mejias, andreac.mejiasa(at)gmail.com
(End) Patricia Vannier [CDS] 19-Jan-2022