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We present fundamental parameters of 4 massive eclipsing binaries in the young massive cluster Westerlund 1. The goal is to measure accurate masses and radii of their component stars, which provide much needed constraints for evolutionary…

Solar and Stellar Astrophysics · Physics 2015-05-30 E. Koumpia , A. Z. Bonanos

The initial cluster mass function (ICMF) in spiral galaxy discs is constrained and compared with data for old globular clusters and young clusters in starbursts. It is found that the observed ages and luminosities of the brightest clusters…

Astrophysics · Physics 2009-11-13 S. S. Larsen

We investigate the star cluster population in the outer parts of the starburst galaxy NGC 5253 using archive images taken with the Hubble Space Telescope's Advanced Camera for Surveys. Based on the F415W, F555W, and F814W photometry ages…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 D. Harbeck , J. Gallagher , D. Crnojević

The early evolution during massive star cluster formation is still uncertain. Observing embedded clusters at their earliest stages of formation can provide insight into the spatial and temporal distribution of the stars and thus probe…

Astrophysics of Galaxies · Physics 2017-11-29 M. Andersen , P. J. Barnes , J. C. Tan , J. Kainulainen , G. de Marchi

We confirm the reality of the recently discovered Milky Way stellar cluster $\textit{Gaia}$ 1 using spectra acquired with the HERMES and AAOmega spectrographs of the Anglo-Australian Telescope. This cluster had been previously undiscovered…

Recent results from Hubble Space Telescope (HST) have resolved starbursts as collections of compact young stellar clusters. Here we present a photometric catalogue of the young stellar clusters in the nuclear starburst of M82, observed with…

Astrophysics · Physics 2016-08-16 V. P. Melo , C. Muñoz-Tuñón , J. Maíz-Apellániz , G. Tenorio-Tagle

A new X-ray, {\it UBVR}$I_c$, and {\it JHK$s$} study of the young cluster Westerlund 2 was undertaken to resolve discrepancies tied to the cluster's distance. Existing spectroscopic observations for bright cluster members and new multi-band…

Astrophysics of Galaxies · Physics 2015-06-16 Giovanni Carraro , David Turner , D. Majaess , Gustavo Baume

We report the discovery of a hitherto undetected population of Wolf-Rayet stars in the young galactic open cluster Westerlund 1. Optical spectroscopy of the cluster identified 11 such objects; provisional classification suggests that 6 are…

Astrophysics · Physics 2009-11-07 J. Simon Clark , Ignacio Negueruela

We present a study of the star cluster formation in M51 based on the image data taken with Advanced Camera for Surveys (ACS) and Wide Field Planetary Camera 2 (WFPC2) of Hubble Space Telescope (HST). We have derived the star cluster…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 Narae Hwang , Myung Gyoon Lee

The very bright and compact massive young cluster, NGC 3603, has been cited as an example of a starburst in the Milky Way and compared with the much-studied R136/30 Doradus region in the Large Magellanic Cloud. Here we build on the…

Solar and Stellar Astrophysics · Physics 2019-04-10 J. E. Drew , M. Monguió , N. J. Wright

The all-sky Milky Way Star Clusters (MWSC) survey provides uniform and precise ages and other parameters for a variety of clusters in the Solar Neighbourhood. We construct the cluster age distribution, investigate its spatial variations,…

Astrophysics of Galaxies · Physics 2018-06-13 A. E. Piskunov , A. Just , N. V. Kharchenko , P. Berczik , R. -D. Scholz , S. Reffert , S. X. Yen

We present a HST multiband analysis of the large population of star clusters in the blue compact galaxy (BCG) Mrk 930. We have reconstructed the spectral energy distributions of the star clusters and estimated age, mass, and extinction for…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 A. Adamo , G. Ostlin , E. Zackrisson , P. Papaderos , N. Bergvall , R. M. Rich , G. Micheva

We present an updated catalog of 1300 objects in the field of M31, including 670 likely star clusters of various types. Archival images were inspected to confirm cluster classifications where possible, but most of the classifications were…

We present a study of the properties of the star-cluster systems around pseudo-bulges of late-type spiral galaxies using a sample of 11 galaxies with distances from 17 to 37 Mpc. Star clusters are identified from multiband HST ACS and WFPC2…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Daiana Di Nino , Michele Trenti , Massimo Stiavelli , C. Marcella Carollo , Claudia Scarlata , Rosemary F. G. Wyse

We present a spectroscopic study of the most massive stars in the young (4 Myr old) stellar cluster LH 95 in the Large Magellanic Cloud. This analysis allows us to complete the census of the stellar population of the system, previously…

Astrophysics of Galaxies · Physics 2015-06-04 N. Da Rio , D. Gouliermis , B. Rochau , A. Pasquali , J. Setiawan , G. De Marchi

Observations indicate that present-day star formation in the Milky Way disk takes place in stellar ensembles or clusters rather than in isolation. Bound, long lived stellar groups are known as open clusters. They gradually lose stars and in…

Massive clusters are more often found in actively star forming galaxies than in quiescent ones, similar to the Milky Way. We have carried out an extensive survey of obscured Milky Way clusters to determine whether our Galaxy is still…

Astrophysics · Physics 2009-11-11 J. Borissova , V. D. Ivanov , D. Minniti , D. Geisler

We present evidence that some of the compact, luminous, young star clusters recently discovered through images taken with the Hubble Space Telescope (HST) have masses comparable to those of old Galactic globular clusters. The "super star…

Astrophysics · Physics 2009-10-28 Luis C. Ho , Alexei V. Filippenko

Context: Recent near-infrared data have contributed to the discovery of new (obscured) massive stellar clusters and massive stellar populations in previously known clusters in our Galaxy. These discoveries lead us to view the Milky Way as…

Solar and Stellar Astrophysics · Physics 2015-06-04 S. Ramírez Alegría , A. Marín-Franch , A. Herrero

We study the population of compact stellar clusters (CSCs) in M81, using the HST/ACS images in the filters F435W, F606W and F814W covering, for the first time, the entire optical extent of the galaxy. Our sample contains 435 clusters of…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 M. Santiago-Cortes , Y. D. Mayya , D. Rosa-Gonzalez
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