J/MNRAS/503/3232 Five new clustered groups of young stars (Pavlidou+, 2021)
The substructure of the Perseus star-forming region: a survey with Gaia DR2.
Pavlidou T., Scholz A., Teixeira P.S.
<Mon. Not. R. Astron. Soc., 503, 3232-3242 (2021)>
=2021MNRAS.503.3232P 2021MNRAS.503.3232P (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; YSOs ; Optical
Keywords: methods: observational - stars: formation -
galaxies: star clusters: general
Abstract:
We use photometric and kinematic data from Gaia DR2 to explore the
structure of the star-forming region associated with the molecular
cloud of Perseus. Apart from the two well-known clusters, IC 348 and
NGC 1333, we present five new clustered groups of young stars, which
contain between 30 and 300 members, named Autochthe, Alcaeus, Heleus,
Electryon, and Mestor. We demonstrate that these are co-moving groups
of young stars, based on how the candidate members are distributed in
position, proper motion, parallax, and colour-magnitude space. By
comparing their colour-magnitude diagrams to isochrones, we show that
they have ages between 1 and 5 Myr. Using 2MASS and WISE colours, we
find that the fraction of stars with discs in each group ranges from
10 to ∼50 per cent. The youngest of the new groups is also
associated with a reservoir of cold dust, according to the Planck map
at 353 GHz. We compare the ages and proper motions of the five new
groups to those of IC 348 and NGC 1333. Autochthe is clearly linked
with NGC 1333 and may have formed in the same star formation event.
The seven groups separate roughly into two sets that share proper
motion, parallax, and age: Heleus, Electryon, and Mestor as the older
set, and NGC 1333 and Autochthe as the younger set. Alcaeus is
kinematically related to the younger set, but at a more advanced age,
while the properties of IC 348 overlap with both sets. All older
groups in this star-forming region are located at higher galactic
latitude.
Description:
The revolutionary precision in astrometry of Gaia DR2 in combination
with the depth allows us for the first time to study the
three-dimensional distribution of the low-mass members of nearby
star-forming regions.
In order to identify objects with circumstellar discs, we also use
data from the Wide-field Infrared Survey Explorer (WISE), observing at
four bands centred at 3.4, 4.6, 12, and 22 um and covering the entire
sky (Wright et al. 2010AJ....140.1868W 2010AJ....140.1868W). We use data from the AllWISE
catalogue and combine it with Two Micron All Sky Survey (2MASS)
magnitudes (Skrutskie et al. 2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233) to
search for excess emission in the infrared as an indicator of the
presence of a disc.
Finally, we use the large-scale map of the dust emission measured at
353 GHz, as made available by the Planck survey (Planck Collaboration
I 2016A&A...594A...1P 2016A&A...594A...1P), to study the link between young stars and the
presence of cold dust.
We present five new clustered groups of young stars, which contain
between 30 and 300 members, named Autochthe, Alcaeus, Heleus,
Electryon, and Mestor. We list in five separate tables, Tables B1-B5,
the members of each group along with their main properties, as they
are listed in Gaia DR2, and their ID from AllWISE.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 184 27 List of Autochthe (PST1) members
tableb2.dat 184 170 List of Alcaeus (PST2) members
tableb3.dat 184 302 List of Mestor (PST3) members
tableb4.dat 184 329 List of Electryon (PST4) members
tableb5.dat 184 85 List of Heleus (PST5) members
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/328 : AllWISE Data Release (Cutri+ 2013)
Byte-by-byte Description of file: tableb?.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- GaiaDR2 Gaia DR2 identifier
20- 33 F14.11 deg RAdeg Right ascension (ICRS) at Ep=2015.5
35- 48 F14.11 deg DEdeg Declination (ICRS) at Ep=2015.5
50- 54 F5.3 mas/yr pmRA Proper motion along RA
56- 75 F20.18 mas/yr e_pmRA Proper motion along RA error
77- 83 F7.3 mas/yr pmDE Proper motion along DE
85-104 F20.18 mas/yr e_pmDE Proper motion along DE error
106-123 F18.16 mas plx Parallax
125-144 F20.18 mas e_plx Parallax error
146-164 F19.16 mag Gmag Gaia G magnitude
166-184 A19 --- AllWISE AllWISE designation
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History:
From electronic version of the journal
(End) Luc Trabelsi [CDS] 02-Apr-2024