J/A+A/686/A118 Young Galactic OP mass and wind luminosity (Celli+, 2024)
Mass and wind luminosity of young Galactic open clusters in Gaia DR2.
Celli S., Specovius A., Menchiari S., Mitchell A., Morlino G.
<Astron. Astrophys. 686, A118 (2024)>
=2024A&A...686A.118C 2024A&A...686A.118C (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Optical ; Mass loss
Keywords: stars: luminosity function, mass function - stars: mass loss -
stars: winds, outflows - open clusters and associations: general -
Abstract:
Star clusters constitute a significant part of the stellar population
in our Galaxy. The feedback processes they exert on the interstellar
medium impact multiple physical processes from the chemical to the
dynamical evolution of the Galaxy. In addition, young and massive
stellar clusters might act as efficient particle accelerators and
contribute to the production of cosmic rays.
We aim at evaluating the wind luminosity driven by the young (<30Myr)
Galactic open stellar clusters observed by the Gaia space mission.
This is crucial for determining the energy channeled into accelerated
particles.
To do this, we developed a method relying on the number, magnitude,
and line-of-sight extinction of the stars observed per cluster.
Assuming that the stellar mass function follows a Kroupa mass
distribution and accounting for the maximum stellar mass allowed by
the age and mass of the parent cluster, we conservatively estimated
the mass and wind luminosity of 387 local clusters within the second
data release of Gaia.
We compared the results of our computation with recent estimates of
young cluster masses. With respect to these, our sample is three times
more abundant, particularly above a few thousand solar masses. This is
of the utmost relevance for predicting the gamma-ray emission
resulting from the interaction of accelerated particles. The cluster
wind luminosity distribution we obtained extends up to 3x1038erg/s.
This is a promising feature in terms of potential particle
acceleration scenarios.
Description:
In this paper we estimate and compile physical parameters of 387 young
(age below 30Myr) open clusters included in Gaia DR2. We employ a
star counting based method, assuming an initial mass function, to
derive reliable values of mass, mass-loss rate, and wind luminosity of
the clusters in our sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 67 387 Physical parameters for 387 clusters
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See also:
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way
(Cantat-Gaudin+, 2018)
J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)
J/A+A/633/A99 : Gaia DR2 open clusters in the Milky Way. II
(Cantat-Gaudin+, 2020)
J/A+A/635/A45 : 570 new open clusters in the Galactic disc
(Castro-Ginard+, 2020)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Cluster Cluster name
19- 22 F4.1 Myr Age Cluster age
24- 30 F7.1 Msun Mc Cluster mass
32- 39 E8.2 Msun/yr Mdotc Cluster mass loss rate
41- 48 E8.2 10-7W Lwc Cluster wind luminosity
49- 56 F8.1 --- k Normalization of the cluster mass function
58- 61 F4.2 Msun Mmin* Minimum stellar mass per cluster
as inferred from Gaia observations
63- 67 F5.2 Msun Mmax* Maximum stellar mass per cluster
as inferred from Gaia observations
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References:
Silvia Celli, silvia.celli(at)uniroma1.it
(End) Silvia Celli [Roma Univ.], Patricia Vannier [CDS] 13-Mar-2024