J/A+A/678/A71 Cluster ages in Sco-Cen (Ratzenboeck+, 2023)
The star formation history of the Sco-Cen association.
Coherent star formation patterns in space and time.
Ratzenboeck S., Grossschedl J., Alves J., Miret-Roig N., Bomze I.,
Forbes J., Goodman A., Hacar A., Lin D., Meingast M. Moeller T., Piecka M.,
Posch L., Rottensteiner A., Swiggum C., Zucker C.
<Astron. Astrophys. 678, A71 (2023)>
=2023A&A...678A..71R 2023A&A...678A..71R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, ages ; Optical
Keywords: Hertzsprung-Russell and C-M diagrams - methods: statistical -
astrometry - stars: statistics - stars: evolution -
open clusters and associations: individual: Sco-Cen
Abstract:
We reconstructed the star formation history of the Sco-Cen OB
association using a novel high-resolution age map of the region. We
developed an approach to produce robust ages for Sco-Cen's recently
identified 37 stellar clusters using the SigMA algorithm. The Sco-Cen
star formation timeline reveals four periods of enhanced star
formation activity, or bursts, remarkably separated by about 5Myr. Of
these, the second burst, which occurred about 15 million years ago, is
by far the dominant one, and most of Sco-Cen's stars and clusters
were in place by the end of this burst. The formation of stars and
clusters in Sco-Cen is correlated but not linearly, implying that more
stars were formed per cluster during the peak of the star formation
rate. Most of the clusters that are large enough to have supernova
precursors were formed during the second burst around 15Myr ago. Star
and cluster formation activity has been continuously declining since
then. We have clear evidence that Sco-Cen formed from the inside out
and that it contains 100-pc long chains of contiguous clusters
exhibiting well-defined age gradients, from massive older clusters to
smaller young clusters. These observables suggest an important role
for feedback in forming about half of Sco-Cen stars, although
follow-up work is needed to quantify this statement. Finally, we
confirm that the Upper-Sco age controversy discussed in the literature
during the last decades is solved: the nine clusters previously lumped
together as Upper-Sco, a benchmark region for planet formation
studies, exhibit a wide range of ages from 3 to 19Myr.
Description:
This provided table contains cluster ages for 37 clusters of the
Sco-Cen OB association as identified with the SigMA clustering
algorithm (see the associated paper for more details). We provide
basic cluster properties such as size, unique cluster identifier,
name, corresponding region. Moreover, we provide inferred ages
alongside 1 sigma uncertainties for each cluster using different
isochronal model families and photometric systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 99 37 Sco-Cen cluster ages
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See also:
J/A+A/677/A59 : SigMA clusters in Sco-Cen (Ratzenboeck+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- SigMA [1/37] Membership label for each cluster
(SigMA) (1)
4- 7 A4 --- Region Traditional Sco-Cen subregions for
orientation (ScoCenRegion)
9- 24 A16 --- Group Cluster Name (GroupName)
26- 29 I4 --- N Number of sources per cluster (NrSources)
31- 34 I4 --- NBPRP Number of sources used in fit with
Gaia Bp-Rp colors (NrSourcesBPRP)
36- 39 I4 --- NGRp Number of sources used in fit with
Gaia G-Rp colors (NrSourcesGrp)
41- 44 F4.1 Myr AgeP-BpRp Age determined using PARSEC models and
Bp-Rp colors (AgePARSEC_BPRP)
46- 49 F4.1 Myr e_AgeP-BpRp Lower 1σ age interval (PARSEC models,
Bp-Rp colors) (eAgePPARSECBPRP)
51- 54 F4.1 Myr E_AgeP-BpRp Upper 1σ age interval (PARSEC models,
Bp-Rp colors) (EAgePARSECBPRP)
56- 59 F4.1 Myr AgeP-GRp Age determined using PARSEC models and
G-Rp colors (AgePPARSEC_GRP)
61- 64 F4.1 Myr e_AgeP-GRp Lower 1σ age interval (PARSEC models,
G-Rp colors) (eAgePARSECGRP)
66- 69 F4.1 Myr E_AgeP-GRp Upper 1σ age interval (PARSEC models,
G-Rp colors) (EAgePARSECGRP)
71- 74 F4.1 Myr AgeB-BpRp Age determined using BHAC15 models and
Bp-Rp colors (AgeBHAC15_BPRP)
76- 79 F4.1 Myr e_AgeB-BpRp Lower 1σ age interval (BHAC15 models,
Bp-Rp colors) (eAgeBHAC15BPRP)
81- 84 F4.1 Myr E_AgeB-BpRp Upper 1σ age interval (BHAC15 models,
Bp-Rp colors) (EAgeBHAC15BPRP)
86- 89 F4.1 Myr AgeB-GRp Age determined using BHAC15 models and
G-Rp colors (AgeBHAC15_GRP)
91- 94 F4.1 Myr e_AgeB-GRp Lower 1σ age interval (BHAC15 models,
G-Rp colors) (eAgeBHAC15GRP)
96- 99 F4.1 Myr E_AgeB-GRp Upper 1σ age interval (BHAC15 models,
G-Rp colors) (EAgeBHAC15GRP)
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Note (1): Identification number from Ratzenboeck et al., 2023A&A...677A..59R 2023A&A...677A..59R,
Cat. J/A+A/677/A59.
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Acknowledgements:
Sebastian Ratzenboeck, sebastian.ratzenboeck(at)univie.ac.at
(End) Patricia Vannier [CDS] 27-Sep-2023