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The young open star cluster M25 (IC 4725) is located in the direction of the galactic center in a crowded region, near much irregular absorption features on Sagittarius arm. This cluster has some difficult observing problems due to its…

Astrophysics · Physics 2007-05-23 A. L. Tadross , A. I. Osman , M. A. Marie , S. M. Hassan , .

We have used deep ACS/WFC images of M33 to check nature of extended objects detected by the ground based survey of Zloczewski et al. (2008). A total of 24 candidates turned out to be genuine compact stellar clusters. In addition we detected…

Solar and Stellar Astrophysics · Physics 2009-03-24 K. Zloczewski , J. Kaluzny

Wide field BVI photometry and $^{12}$CO(1$\to$0) observations are presen ted in the region of the open cluster NGC 6520 and the dark molecular cloud Barnard~86. From the analysis of the optical data we find that the cluster is rather…

Astrophysics · Physics 2009-11-11 Giovanni Carraro , Rene Mendez , Jorge May , Diego Mardones

We construct a sample of nearly 30,000 main-sequence stars with 4500K $<T\rm_{eff}<$ 5000K and stellar ages estimated by the chromospheric activity$-$age relation. This sample is used to determine the age distribution in the $R-Z$ plane of…

Astrophysics of Galaxies · Physics 2021-03-03 Jiajun Zhang , Jingkun Zhao , Terry D. Oswalt , Xilong Liang , Xianhao Ye , Gang Zhao

We present results on the recently discovered stellar system YMCA-1, for which physical nature and belonging to any of the Magellanic System galaxies have been irresolutely analyzed. We used SMASH and {\it Gaia} EDR3 data sets to conclude…

Astrophysics of Galaxies · Physics 2022-07-27 Andrés E. Piatti , Scott Lucchini

The dust cloud TGU H645 P2 and embedded in it young open cluster NGC 7129 are investigated using the results of medium-band photometry of 159 stars in the Vilnius seven-colour system down to V = 18.8 mag. The photometric data were used to…

We have carried out a survey of compact star clusters (apparent size <3 arcsec) in the southwest part of the M31 galaxy, based on the high-resolution Suprime-Cam images (17.5 arcmin x 28.5 arcmin), covering ~15% of the deprojected galaxy…

Astrophysics of Galaxies · Physics 2009-11-18 V. Vansevicius , K. Kodaira , D. Narbutis , R. Stonkute , A. Bridzius , V. Deveikis , D. Semionov

We investigate the nature of a sample of star cluster candidates detected as stellar overdensities towards the Galactic anticentre. Taken from the catalogue of Froebrich, Scholz, and Raftery (FSR), the sample contains 28 star cluster…

Astrophysics · Physics 2009-11-13 Charles Bonatto , Eduardo Bica

One of the results of the Milky Way Star Clusters (MWSC) survey by Kharchenko et al. (2013) was the detection of a slight under-density of old (ca. 1 Gyr) clusters within the nearest kilo-parsec from the Sun. This under-density may be due…

Solar and Stellar Astrophysics · Physics 2016-10-26 Siegfried Roeser , Elena Schilbach , Bertrand Goldman

We report the discovery of a new young stellar cluster in the outer Galaxy located at the position of an IRAS PSC source that has been previously mis-identified as an external galaxy. The cluster is seen in our near-infrared imaging towards…

Solar and Stellar Astrophysics · Physics 2015-08-06 J. L. Yun , D. Elia , A. A. Djupvik , J. M. Torrelles , S. Molinari

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

NGC 7067 is a young open cluster located in the direction between the first and the second Galactic quadrants and close to the Perseus spiral arm. This makes it useful for studies of the nature of the Milky Way spiral arms. Stromgren…

We report metallicities for three $\sim$Gyr-old stars in the Milky Way nuclear star cluster (NSC) using high-resolution near-infrared spectroscopy. We derive effective temperatures from a calibration with Sc line strength, which yields…

Recent high-resolution observations with the Hubble Space Telescope (HST) reveal that star clusters of extraordinary luminosity and compactness are commonly found in a variety of starburst systems. There has been much speculation that these…

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

We present a near-infrared study of the candidate star cluster Mercer 81, located at the centre of the G338.4+0.1 HII region, and close to the TeV gamma-ray source HESS 1640-465. Using HST/NICMOS imaging and VLT/ISAAC spectroscopy we have…

We study the quiescent ultra-diffuse galaxy FCC 224 in the Fornax cluster using Hubble Space Telescope (HST) imaging, motivated by peculiar properties of its globular cluster (GC) system revealed in shallower imaging. The surface brightness…

(abridged) In this paper we aim at determining the shape, size, and luminosity/mass of the Milky Way Nuclear Star Cluster (MWNSC). We use Spitzer/IRAC images at 3.6 and 4.5 micrometer, where interstellar extinction is at a minimum but the…

Astrophysics of Galaxies · Physics 2014-06-18 R. Schodel , A. Feldmeier , D. Kunneriath , S. Stolovy , N. Neumayer , P. Amaro-Seoane , S. Nishiyama

This paper compares reddening values E(B-V) derived from the stellar content of 103 old open clusters and 147 globular clusters of the Milky Way with those derived from DIRBE/IRAS 100 micron dust emission in the same directions. Star…

Astrophysics · Physics 2007-05-23 C. M. Dutra , E. Bica

Single epoch K-band photometry of 32 RR Lyrae stars in the young galactic globular cluster IC4499 is presented. The mean magnitudes have been estimated using the K-band template light-curves of Jones, Carney and Fulbright (1996). We derive…

Astrophysics · Physics 2009-11-10 Jesper Storm

We report the discovery of four galaxy candidates observed 450 - 600 Myr after the Big Bang with photometric redshifts between z ~ 8.3 - 10.2 measured using the JWST NIRCam imaging of the galaxy cluster WHL0137-08 observed in 8 filters…

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