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Integrated spectra have been obtained of 31 star clusters in the Magellanic Clouds (MC) and of 4 Galactic globular clusters. The spectra cover the wavelength range 3500 -- 4700 Angstroms at a resolution of 3.2 Angstroms FWHM. The MC…

Astrophysics · Physics 2007-05-23 Andrew. J. Leonardi , James. A. Rose

The characteristics of the cluster systems of the Magellanic Clouds, as inferred from integrated properties, are compared with those from individual cluster studies and from the field population. The agreement is generally satisfactory…

Astrophysics · Physics 2007-05-23 G. S. Da Costa

We use HST observations to study the LMC's young cluster NGC1844. We estimate the fraction and the mass-ratio distribution of photometric binaries and report that the main sequence presents an intrinsic breadth which can not be explained in…

Solar and Stellar Astrophysics · Physics 2015-06-12 A. P. Milone , L. R. Bedin , S. Cassisi , G. Piotto , J. Anderson , A. Pietrinferni , R. Buonanno

We present our new, fully-automated method to detect and measure the ages of star clusters in nearby galaxies, where individual stars can be resolved. The method relies purely on statistical analysis of observations and Monte-Carlo…

We examine the star clusters in the irregular galaxy NGC 4449. We use a near-infrared spectrum and broad-band images taken with the HST to place a limit of 8--15 Myrs on the age of the bright central ojbect in NGC 4449. Its luminosity and…

Astrophysics · Physics 2009-10-31 Andrea E. Gelatt , Deidre A. Hunter , J. S. Gallagher

Colour-magnitude diagrams are presented for the first time for L32, L38, K28 (L43), K44 (L68) and L116, which are clusters projected onto the outer parts of the Small Magellanic Cloud (SMC). The photometry was carried out in the Washington…

Astrophysics · Physics 2009-11-06 A. E. Piatti , J. F. C. Santos , J. J. Claria , E. Bica , A. Sarajedini , D. Geisler

The conventional picture of coeval, chemically homogeneous, populous star clusters -- known as `simple stellar populations' (SSPs) -- is a view of the past. Photometric and spectroscopic studies reveal that almost all ancient globular…

Astrophysics of Galaxies · Physics 2021-04-07 Shalmalee Kapse , Richard de Grijs , Daniel B. Zucker

We present structural parameters for the seven intermediate-age and old star clusters NGC121, Lindsay 1, Kron 3, NGC339, NGC416, Lindsay 38, and NGC419 in the Small Magellanic Cloud. We fit King profiles and Elson, Fall, and Freeman…

New star cluster candidates projected toward the Large and Small Magellanic Clouds (L/SMC) have been recently discovered from relatively deep imaging surveys. We here conduct a sound analysis of 24 star cluster candidates located in the…

Astrophysics of Galaxies · Physics 2021-03-10 Andrés E. Piatti

Young and intermediate-age star clusters of both Magellanic Clouds exhibit complex color-magnitude diagrams. In addition to the extended main-sequence turn-offs (eMSTOs), commonly observed in star clusters younger than ~2 Gyr, the clusters…

We have analyzed multi-passband photometric observations, obtained with the {\it Hubble Space Telescope}, of the massive ($1.8 \times 10^5 M_\odot$), intermediate-age (1.8 Gyr-old) Large Magellanic Cloud star cluster NGC 1783. The…

Astrophysics of Galaxies · Physics 2018-02-21 Hao Zhang , Richard de Grijs , Chengyuan Li , Xiaohan Wu

We present V, V-I color-magnitude diagrams (CMDs) for three old star clusters in the Large Magellanic Cloud (LMC): NGC 1466, NGC 2257 and Hodge 11. Our data extend about 3 magnitudes below the main-sequence turnoff, allowing us to determine…

Astrophysics · Physics 2009-10-31 J. A. Johnson , M. Bolte , P. B. Stetson , J. E. Hesser , R. S. Somerville

We infer the ages of three young stellar clusters, NGC 2004, NGC 7419, and NGC 2100, using Stellar Ages, a statistical algorithm designed to infer stellar population properties from color magnitude diagrams. Recent studies have revealed…

We address the issue about the variation of the star cluster frequency (CF) in the Large Magellanic Cloud (LMC) in terms of the cluster spatial distribution. We adopted the LMC regions traced by Harris & Zaritsky (2009) and used an updated…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Andrés E. Piatti

Studies during the last decade have revealed that nearly all Globular Clusters (GCs) host multiple populations (MPs) of stars with a distinctive chemical patterns in light elements. No evidence of such MPs has been found so far in…

Astrophysics of Galaxies · Physics 2016-05-25 I. Cabrera-Ziri , C. Lardo , B. Davies , N. Bastian , G. Beccari , S. S. Larsen , S. Hernandez

The optical integrated spectra of three LMC young stellar clusters (NGC 1984, NGC 1994 and NGC 2011) exhibit concave continua and prominent molecular bands which deviate significantly from the predictions of single stellar population (SSP)…

Astrophysics of Galaxies · Physics 2017-08-30 Randa S. Asa'd , Alexandre Vazdekis , Miguel Cervino , Noelia E. D. Noel , Michael A. Beasley , Mahmoud Kassab

We present flux-calibrated integrated spectra in the optical range (3700-6800 \AA) obtained at Complejo Astron\'omico El Leoncito (CASLEO, Argentina) for a sample of 10 concentrated star clusters belonging to the Large Magellanic Cloud…

Solar and Stellar Astrophysics · Physics 2016-06-29 Andrea V. Ahumada , Luis R. Vega , Juan J. Clariá , Mónica A. Oddone , Tali Palma

We use the Wide Field Camera 3 onboard the Hubble Space Telescope to obtain deep, high-resolution photometry of the young (age ~ 300 Myr) star cluster NGC1856 in the Large Magellanic Cloud. We compare the observed colour-magnitude diagram…

Solar and Stellar Astrophysics · Physics 2015-05-27 Matteo Correnti , Paul Goudfrooij , Thomas H. Puzia , Selma E. de Mink

We review the complications involved in the conversion of stellar luminosities into masses and apply a range of mass-to-luminosity relations to our Hubble Space Telescope observations of the young LMC star clusters NGC 1805 and NGC 1818.…

Astrophysics · Physics 2009-11-07 R. de Grijs , G. F. Gilmore , R. A. Johnson , A. D. Mackey

We present an investigation of the relationship between giant molecular cloud (GMC) properties and the associated stellar clusters in the nearby flocculent galaxy NGC 7793. We combine the star cluster catalog from the HST LEGUS (Legacy…

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