Trumpler 27 - A heavily reddened young open cluster with blue and red supergiants

1977 ◽  
Vol 215 ◽  
pp. 106 ◽  
Author(s):  
A. F. J. Moffat ◽  
M. P. Fitzgerald ◽  
P. D. Jackson
Keyword(s):  
Open Cluster ◽  
Young Open Cluster ◽  
Red Supergiants

scholarly journals NGC 3105: a young open cluster with low metallicity

2018 ◽  
Vol 616 ◽  
pp. A124 ◽  
Author(s):  
J. Alonso-Santiago ◽  
A. Marco ◽  
I. Negueruela ◽  
H. M. Tabernero ◽  
N. Castro ◽  
...  
Keyword(s):  
Open Cluster ◽  
High Mass ◽  
Complete Analysis ◽  
Evolutionary Models ◽  
Chemical Abundances ◽  
Evolved Stars ◽  
Young Open Cluster ◽  
Red Supergiants ◽  
Low Metallicity ◽  
First Time

Context. NGC 3105 is a young open cluster hosting blue, yellow, and red supergiants. This rare combination makes it an excellent laboratory for constraining evolutionary models of high-mass stars. It has been poorly studied, and the fundamental parameters such as its age or distance are not well defined. Aims. We intend to characterise in an accurate way the cluster and its evolved stars, for which we derive for the first time atmospheric parameters and chemical abundances. Methods. We performed a complete analysis combining UBVR photometry with spectroscopy. We obtained spectra with classification purposes for 14 blue stars and high-resolution spectroscopy for an in-depth analysis of the six other evolved stars. Results. We identify 126 B-type likely members within a radius of 2.7 ± 0.6 arcmin, which implies an initial mass, Mcl ≈ 4100 M⊙. We find a distance of 7.2 ± 0.7 kpc for NGC 3105, placing it at RGC = 10.0 ± 1.2 kpc. Isochrone fitting supports an age of 28 ± 6 Ma, implying masses around 9.5 M⊙ for the supergiants. A high fraction of Be stars (≈25%) is found at the top of the main sequence down to spectral type b3. From the spectral analysis we estimate for the cluster an average νrad = +46.9 ± 0.9 km s−1 and a low metallicity, [Fe/H] = −0.29 ± 0.22. We also have determined, for the first time, chemical abundances for Li, O, Na, Mg, Si, Ca, Ti, Ni, Rb, Y, and Ba for the evolved stars. The chemical composition of the cluster is consistent with that of the Galactic thin disc. An overabundance of Ba is found, supporting the enhanced s-process. Conclusions. NGC 3105 has a low metallicity for its Galactocentric distance, comparable to typical LMC stars. It is a valuable spiral tracer in a very distant region of the Carina–Sagittarius spiral arm, a poorly known part of the Galaxy. As one of the few Galactic clusters containing blue, yellow, and red supergiants, it is massive enough to serve as a test bed for theoretical evolutionary models close to the boundary between intermediate- and high-mass stars.

scholarly journals Cluster membership for the long-period Cepheid calibrator SV Vul

2020 ◽  
Vol 494 (2) ◽  
pp. 3028-3036 ◽  
Author(s):  
I Negueruela ◽  
R Dorda ◽  
A Marco
Keyword(s):  
Open Cluster ◽  
Hubble Constant ◽  
Cluster Membership ◽  
Long Period ◽  
Classical Cepheids ◽  
Good Accordance ◽  
Young Open Cluster ◽  
Red Supergiants ◽  
Stellar Properties ◽  
Gaia Dr2

ABSTRACT Classical Cepheids represent the first step of the distance scale ladder. Claims of tension between the locally calculated Hubble constant and the values deduced from Planck’s results have sparked new interest in these distance calibrators. Cluster membership provides an independent distance measurement, as well as astrophysical context for studies of their stellar properties. Here, we report the discovery of a young open cluster in the vicinity of SV Vul, one of the most luminous Cepheids known in the Milky Way. Gaia DR2 data show that SV Vul is a clear astrometric and photometric member of the new cluster, which we name Alicante 13. Although dispersed, Alicante 13 is moderately well populated, and contains three other luminous stars, one early-A bright giant and two low-luminosity red supergiants. The cluster is about 30 Ma old at a nominal distance of 2.5 kpc. With this age, SV Vul should have a mass around $10$ M⊙, in good accordance with its luminosity, close to the highest luminosity for Cepheids allowed by recent stellar models.

scholarly journals [ITAL]UBVRI[/ITAL] and Hα Photometry of the Young Open Cluster NGC 6530

2000 ◽  
Vol 120 (1) ◽  
pp. 333-348 ◽  
Author(s):  
Hwankyung Sung ◽  
Moo-Young Chun ◽  
Michael S. Bessell
Keyword(s):  
Open Cluster ◽  
Young Open Cluster

scholarly journals ASPITZERVIEW OF THE YOUNG OPEN CLUSTER NGC 2264

2009 ◽  
Vol 138 (4) ◽  
pp. 1116-1136 ◽  
Author(s):  
Hwankyung Sung ◽  
John R. Stauffer ◽  
Michael S. Bessell
Keyword(s):  
Open Cluster ◽  
Young Open Cluster

scholarly journals CHARACTERIZATION OF THE YOUNG OPEN CLUSTER G144.9+0.4 IN THE CAMELOPARDALIS OB1 ASSOCIATION

2013 ◽  
Vol 775 (2) ◽  
pp. 123
Author(s):  
Chien-Cheng Lin ◽  
W. P. Chen ◽  
Neelam Panwar
Keyword(s):  
Open Cluster ◽  
Young Open Cluster

scholarly journals The young open cluster Trumpler 3

2010 ◽  
Vol 331 (3) ◽  
pp. 312-322
Author(s):  
G. Maciejewski ◽  
L. Bukowiecki
Keyword(s):  
Open Cluster ◽  
Young Open Cluster

scholarly journals Defining the Binary Star Population in the Young Open Cluster M35 (NGC 2168)

2007 ◽  
Vol 3 (S246) ◽  
pp. 105-106
Author(s):  
Ella K. Braden ◽  
Robert D. Mathieu ◽  
Sören Meibom
Keyword(s):  
Binary Systems ◽  
Initial Conditions ◽  
Binary Star ◽  
Open Cluster ◽  
Open Clusters ◽  
Spatial Period ◽  
Large Sample Size ◽  
Long Baseline ◽  
Dynamical Simulations ◽  
Young Open Cluster

AbstractWe present current results from the ongoing WIYN Open Cluster Study radial-velocity survey for 1410 stars in the young (150 Myr) open cluster M35 (NGC 2168) and establish a benchmark for initial conditions in young open clusters. We find for periods ≲ 1000 days a minimum binary frequency of 0.36 – 0.51. We also analyze the spatial, period and eccentricity distributions of the binary systems and find that the period and eccentricity distributions are well approximated by scaled field distributions from Duquennoy & Mayor (1991). With our large sample size and long baseline, we have a unique understanding of the binary population in this young cluster, making it ideal for defining initial conditions for dynamical simulations.

NGC 6124: a young open cluster with anomalous- and fast-rotating giant stars

2021 ◽  
Author(s):  
N Holanda ◽  
N Drake ◽  
W J B Corradi ◽  
F A Ferreira ◽  
F Maia ◽  
...  
Keyword(s):  
Isotopic Ratio ◽  
Rotational Velocity ◽  
Open Cluster ◽  
Chemical Species ◽  
Stellar Atmospheres ◽  
Lithium Abundance ◽  
Giant Stars ◽  
Analysis Technique ◽  
Young Open Cluster ◽  
Fast Rotating

Abstract We present the results of a chemical analysis of fast and anomalous rotator giants members of the young open cluster NGC 6124. For this purpose, we carried out abundances of the mixing sensitive species such as Li, C, N, Na and 12C/13C isotopic ratio, as well as other chemical species for a sample of four giants among the seven observed ones. This study is based on standard spectral analysis technique using high-resolution spectroscopic data. We also performed an investigation of the rotational velocity (v sin  i) once this sample exhibit abnormal values – giant stars commonly present rotational velocities of few km s−1. In parallel, we have been performed a membership study, making use of the third data release from ESA Gaia mission. Based on these data, we estimated a distance of d = 630 pc and an age of 178 Myr through isochrone fitting. After that procedure, we matched all the information raised and investigated the evolutionary stages and thermohaline mixing model through of spectroscopic Teff and log  g and mixing tracers, as 12C/13C and Na, of the studied stars. We derived a low mean metallicity of [Fe/H] = −0.13 ±0.05 and a modest enhancement of the elements created by the s-process such as Y, Zr, La, Ce, and Nd, which is in agreement of what has already been reported in the literature for young clusters. The giants analyzed have homogeneous abundances, except for lithium abundance [log  ε(Li)NLTE = 1.08±0.42] and this may be associated to a combination of mechanisms that act increasing or decreasing lithium abundances in stellar atmospheres.

scholarly journals Red supergiants around the obscured open cluster Stephenson 2

2012 ◽  
Vol 547 ◽  
pp. A15 ◽  
Author(s):  
I. Negueruela ◽  
A. Marco ◽  
C. González-Fernández ◽  
F. Jiménez-Esteban ◽  
J. S. Clark ◽  
...  
Keyword(s):  
Open Cluster ◽  
Red Supergiants
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