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J/A+A/XX/XX Low mass young stars in the Milky Way from Gaia (Prisinzano+, 2022)
================================================================================
Low mass young stars in the Milky Way unveiled by DBSCAN and Gaia EDR3. Mapping
the star forming regions within 1.5 Kpc
L. Prisinzano, F. Damiani, S. Sciortino, E. Flaccomio, M. G. Guarcello,
G. Micela, E. Tognelli, R. D. Jeffries, J. M. Alcala'
<Astron. Astrophys. XXX, XXX (2022)>
=2022A&A...XXXX (SIMBAD/NED BibCode)
================================================================================
ADC_Keywords: YSOs; Stars, pre-main sequence; Clusters, open; Fundamental
catalog; Galactic plane; Milky Way;
Keywords: methods: data analysis - stars: formation, pre-main sequence - Galaxy:
open clusters and associations: general - catalogues - surveys
Abstract: Stars form in clusters and are mainly distributed in the Galactic
disk.
Mapping the youngest stellar populations of the Milky Way is crucial to
characterise the Galactic spiral arms and shed light on star and planet
formation theories. By combining the unprecedented astrometric precision
of Gaia EDR3 data, a machine learning unsupervised clustering algorithm,
and the stellar evolutionary properties from the exquisite Gaia
color-absolute magnitude diagrams, we identified 124 440 young low mass
stars clustered in 354 star forming regions (SFRs) younger than 10 Myr
within about 1.5 Kpc. In addition, 65 863 low mass members of 322 open
clusters (OCs) located within about 500 pc and with ages 10 Myr<t<100 Myr
were also found.
A substantial number of them are recognised for the first time and the bulk
of previously known star forming regions are also detected enabling us to
homogeneously single out the asymmetric complex structure of the Galaxy
in the solar neighbourhood.
The catalogue can serve as base for future studies on star
formation history, cluster dynamics, and Initial Mass Function, as well
as detailed studied of circumstellar disk evolution and search for young
giant planets by direct imaging.
Description: Gaia EDR3 astrometric and kinematic parameters (l, b, parallaxes
and proper motions) and photometry in three broad bands (G, G_BP, G_RP)
in the Galactic Plane (b|<30 deg) were used to select, with the machine
learning clustering algorithm DBSCAN, clusters kinematically and
spatially coerent. A subsample of 52 clusters, selected among the 7323
found with DBSCAN, has been used as template data set, to identify very
young clusters from the pattern of the observed colour-absolute
magnitude diagrams through a pattern match process.
Table 3 presents some properties of the SFRs and the OCs found in this
work. It includes an identification number, the median of the Galactic
coordinates of the members, the radius containing half of the members,
the cluster distance obtained as the median of inverted parallaxes of
members and the total number of members. A flag from 1 to 28 is assigned
to the SFRs with ages t < 10 Myr and from 29 to 36 to the OCs with ages
10 Myr < t <100 Myr. The literature cluster names given in the last
column are mainly taken from Cantat-Gaudin & Anders (2020) or Zucker et
al. (2020) or from Simbad, and are only indicative of the region.
Table 4 lists the Gaia EDR3 data (source identification, Galactic
coordinates, parallax, proper motion and G, BP, RP magnitudes) of members
found for the SFRs and the OCs presented in Table 3. The flag and the
identification number of the cluster to which they belong are also
given.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 74 676
table4.dat 120 190303
See also:
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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3- 5 I3 --- Cluster_ID ID of SFRs and young stellar clusters
7- 14 F8.3 deg GLON Median Galactic longitude of members
17- 23 F7.3 deg GLAT Median Galactic latitude of members
27- 32 F6.3 deg r50 Radius containing half of the members (r50)
37- 40 I4 pc d Median of inverted parallaxes of members
44- 48 I5 --- N Number of members
53- 54 I2 --- Flag Flag ([1:28] for SFRs; [29:36] for OCs)
58- 73 A16 --- Name Literature cluster name
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
7- 25 I19 --- Source_ID Gaia EDR3 unique source identifier
27- 33 F7.3 --- l Galactic longitude
35- 41 F7.3 --- b Galactic latitude
44- 49 F6.3 --- Plx Corrected parallax
53- 57 F5.3 --- e_Plx Standard error of parallax
59- 65 F7.3 --- pmRA Proper motion in RA direction
69- 73 F5.3 --- e_pmRA Standard error of proper motion in RA
75- 81 F7.3 --- pmDE Proper motion in Dec
85- 89 F5.3 --- e_pmDE Standard error of proper motion in Dec
92- 96 F5.2 --- Gmag G-band mean magnitude
99-103 F5.2 --- BPmag ? Integrated BP mean magnitude
106-110 F5.2 --- GPmag Integrated RP mean magnitude
112-113 I2 --- Flag Flag ([1:28] for SFRs; [29:36] for OCs)
117-119 I3 --- Cluster_ID Table 3 Cluster ID
Acknowledgements: Loredana Prisinzano, loredana.prisinzano(at)inaf.it
References:
Gaia Early Data Release 3: Summary of the contents and survey properties
Brown, A.G.A., et al., 2020A&A...649A...1G 2020A&A...649A...1G
Gaia Early Data Release 3: The astrometric solution
Lindegren, L., et al., 2020A&A...649A...2L 2020A&A...649A...2L
Gaia Early Data Release 3: Photometric content and validation
Riello, M., et al., 2020A+&...649A...3R 2020A+&...649A...3R, Cat. J/A+A/649/A3
Gaia Early Data Release 3: Parallax bias versus magnitude, colour and position
Lindegren, L., et al., 2020A&A...649A...4L 2020A&A...649A...4L
================================================================================