J/A+A/657/A131 Ten new systems with O stars (Maiz Apellaniz+, 2022)
The Villafranca catalog of Galactic OB groups.
II. From Gaia DR2 to EDR3 and ten new systems with O stars.
Maiz Apellaniz J., Barba R.H., Fernandez Aranda R., Pantaleoni Gonzalez M.,
Crespo Bellido P., Sota A., Alfaro E.J.
<Astron. Astrophys., 657, A131 (2022)>
=2022A&A...657A.131M 2022A&A...657A.131M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions ; Parallaxes, trigonometric
Keywords: astrometry - catalogs - Galaxy: structure -
open clusters and associations: general -
stars: kinematics and dynamics - stars: early-type
Abstract:
This is the second paper of a series on Galactic OB groups that uses
astrometric and photometric data from Gaia and spectral
classifications from the Galactic O-Star Spectroscopic Survey (GOSSS)
and the Library of Libraries of Massive-star high-Resolution spectra
(LiLiMaRlin). The previous paper was based on the second Gaia data
release (DR2). Since then, the early third Gaia data release (EDR3)
has appeared with new astrometry and photometry.
The two aims of this paper are to revise the results for the sample
from Paper I using Gaia EDR3 data and to expand the sample of analyzed
stellar groups to 26, from Villafranca O-001 to Villafranca O-026.
We used GOSSS to select Galactic stellar groups with O stars
and an updated version of the method in Paper 0 of this series,
combining Gaia EDR3 G + GBP + GRP photometry, positions, proper
motions, and parallaxes to assign memberships and measure distances.
We present 99 spectra from GOSSS and 32 from LiLiMaRlin for stars in
the analyzed groups or in their foreground.
We derived distances to the 26 stellar groups with unprecedented
precision and accuracy, with total (random plus systematic)
uncertainties lower than 1% for distances within 1 kpc and of ∼3%
around 3 kpc, which are values almost four times better than for Gaia
DR2. We provide homogeneous spectral types for 110 stars and correct a
number of errors in the literature, especially for objects in
Villafranca O-023 (Orion nebula cluster). For each group, we discuss
its membership and present possible runaway and walkaway stars. At
least two of the studied groups, Villafranca O-O12 S in NGC 2467 and
Villafranca O-014 NW in the North America nebula, are orphan clusters
in which the most massive stars have been ejected by dynamical
interactions, leaving objects with a capped mass function. The
existence of such clusters has important consequences for the study of
the initial mass function (IMF), the distribution of supernova
explosions across the Galaxy, and the population and dynamics of
isolated compact objects. We fit pre-main-sequence (PMS) isochrones to
the color-magnitude diagrams (CMDs) of four clusters to derive ages of
2.0±0.5Ma for Villafranca O-026 (σ Orionis cluster), 4±2Ma
for Villafranca O-016 (NGC 2264), 5.0±0.5Ma for Villafranca O-021
(NGC 2362), and 8±2Ma for Villafranca O-024 (γ Velorum
cluster).
Description:
We reanalyze the sample of 16 stellar groups of Villafranca I (Maiz
Apellaniz et al., 2020A&A...643A.138M 2020A&A...643A.138M, Cat. J/A+A/643/A138) using Gaia
EDR3 data and include ten additional objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 80 31 Field sizes and filters applied to the O-type
stellar groups and subgroups in this paper
tablea2.dat 86 31 Membership and distance results
tablea3.dat 161 99 New GOSSS spectral classifications
tablea4.dat 180 31 New LiLiMaRlin spectral classifications
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/643/A138 : Possible runaway stars list (Maiz Apellaniz+, 2020)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Group Group Name (O-NNN)
7- 8 A2 --- m_Group Multiplicity index on Group
10- 15 I6 --- Nf Number of Gaia EDR3 sources in the field
17- 19 I3 arcmin Size1 Field size
20 A1 --- --- [x]
21- 23 I3 arcmin Size2 Field size
25- 30 F6.2 deg RAdeg Filtering center Right ascension (J2000)
32- 37 F6.2 deg DEdeg Filtering center Declination (J2000)
39- 42 I4 arcsec r Filtering separation from the center in
the plane of the sky
44- 48 F5.2 mas/yr pmRA* Filtering central Proper motion along RA,
pmRA*cosDE
50- 54 F5.2 mas/yr pmDE Filtering central Proper motion along DE
56- 59 F4.2 mas/yr rpm Filtering separation from the center
in proper motion
61 A1 --- l_D(G'BP-G'RP) Filtering color displacement with respect
to isochrone
63- 67 F5.2 --- D(G'BP-G'RP) Filtering color displacement with respect
to isochrone or lower value if interval
69 A1 --- --- [-]
71- 75 F5.2 --- D(G-BP-G'RP)2 ? Upper value of D(G-BP-G'RP) interval
77- 80 F4.1 mag G'max ? Filtering maximum corrected G magnitude
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Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Group Field Name (O-NNN)
7- 8 A2 --- m_Group Multiplicity index on Group
10- 12 I3 --- N*0 Number of stars in group before normalized
parallax filtering
14- 16 I3 --- N* Number of stars in group after normalized
parallax filtering
18- 21 F4.2 --- tplx Normalized chi2 test for the group parallax
23- 27 F5.2 --- tpmRA* Normalized chi2 test for the
group proper motion in RA
29- 33 F5.2 --- tpmDE Normalized chi2 test for the
group proper motion in DE
35- 40 F6.3 mas/yr pmRA*g Group proper motion in RA, pmRA*cosDE
42- 46 F5.3 mas/yr e_pmRA*g Error on group proper motion in RA
48- 53 F6.3 mas/yr pmDEg Group proper motion in DE
55- 59 F5.3 mas/yr e_pmDEg Error on group proper motion in
61- 65 F5.3 mas plxg Group parallax
67- 71 F5.3 mas e_plxg Error on Group parallax
73- 76 I4 pc d Group distance
78 A1 --- --- [+]
79- 81 I3 pc E_d Error on Group distance, lower value
83 A1 --- --- [-]
84- 86 I3 pc e_d Error on Group distance, upper value
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Byte-by-byte Description of file: tablea3.dat tablea4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Star name
25- 39 A15 --- GOSS GOS/GBS/GAS/GWS identifier (LLL.ll+BB.bb_NN)
41- 59 I19 --- GaiaEDR3 ? GaiaEDR3 identification number
61- 65 I5 --- ALS ?=- ALS identification number
67- 71 A5 --- Group Group name (O-NNN)
73- 78 A6 --- SpType Spectral type
80- 82 A3 --- LumCl Luminosity class
85- 91 A7 --- Qual Luminosity class qualifier
93-112 A20 --- SpType2 Second component spectral type and
luminosity class
114-181 A68 --- Notes Notes
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History:
From electronic version of the journal
References:
Maiz Apellaniz et al., Paper I 2020A&A...643A.138M 2020A&A...643A.138M, Cat. J/A+A/643/A138
(End) Patricia Vannier [CDS] 11-Apr-2022