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14561. 35 star clusters and fields in the SMC
ID:
ivo://CDS.VizieR/J/A+A/647/A135
Title:
35 star clusters and fields in the SMC
Short Name:
J/A+A/647/A135
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this work we study 35 stellar clusters in the Small Magellanic Cloud (SMC) in order to provide their mean metallicities and ages. We also provide mean metallicities of the fields surrounding the clusters. We used Stroemgren photometry obtained with the 4.1 m SOAR telescope and take advantage of (b-y) and m1 colors for which there is a metallicity calibration presented in the literature. The spatial metallicity and age distributions of clusters across the SMC are investigated using the results obtained by Stroemgren photometry. We confirm earlier observations that younger, more metal-rich star clusters are concentrated in the central regions of the galaxy, while older, more metal-poor clusters are located farther from the SMC center. We construct the age-metallicity relation for the studied clusters and find good agreement with theoretical models of chemical enrichment, and with other literature age and metallicity values for those clusters. We also provide the mean metallicities for old and young populations of the field stars surrounding the clusters, and find the latter to be in good agreement with recent studies of the SMC Cepheid population. Finally, the Stroemgren photometry obtained for this study is made publicly available.
14562. Star clusters and other objects in M31 field
ID:
ivo://cfa.tdc/m31_proj/m31_proj.scs.q/cone
Title:
Star clusters and other objects in M31 field
Short Name:
M31 clusters
Date:
20 Jul 2023 19:50:52
Publisher:
Smithsonian Astrophysical Observatory Telescope Data Center
Description:
This catalog contains derived information and access to spectra for a catalog of objects in the field of M31, drawn from the study of star clusters, HII regions, PNe and individual stars in M31 done with Hectospec on the MMT by Nelson Caldwell and a host of others.
14563. Star clusters, associations, & candidates in the MW
ID:
ivo://CDS.VizieR/J/AJ/157/12
Title:
Star clusters, associations, & candidates in the MW
Short Name:
J/AJ/157/12
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a catalog of Galactic star clusters, associations and candidates with 10978 entries. This multi-band catalog was constructed over 20 years, starting with visual inspections on the Digital Sky Survey and incremented with the 2MASS, WISE, VVV, Spitzer, and Herschel surveys. Large and small catalogs, as well as papers on individual objects have been systematically cross-identified. The catalog provides Galactic and equatorial coordinates, angular diameters, and chronologically ordered designations, making it simple to assign discoveries and verify how often the objects were cataloged by different authors, search methods, and/or surveys. Detection in a single band is the minimum constraint to validate an entry. About 3200 objects have measured parameters in the literature. A fundamental contribution of the present study is to present an additional ~7700 objects for the first analyses of nature, photometry, spectroscopy and structure. The present focus is not to compile or determine fundamental parameters, but to provide a catalog uniformly characterizing the entries. A major result is that now 4234 embedded clusters are cataloged, a factor of ~1.5 larger than open clusters. In addition to cross-identifications in different references and wavelength domains, we also communicate the discovery of 638 star clusters and similar objects. The present general catalog provides previously studied objects and thousands of additional entries in a homogeneous way, a timely contribution to Gaia-related works.
14564. Star Clusters/Associations. I. Associations
ID:
ivo://CDS.VizieR/VII/31B
Title:
Star Clusters/Associations. I. Associations
Short Name:
VII/31B
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalog contains data and bibliographical citations for all 70 associations of the second edition of the "Catalogue of Star Clusters and Associations (CSCA)" edited by Alter et al. (1970) which includes data for open clusters, associations, globular clusters and extragalactic objects up to 1967 and "Supplement to the CSCA" by Ruprecht et al. (1982), which contains the supplementary data up to the end of 1973. Thus, the literature is covered through 1973. The catalog includes the years of the literature, references, authors, abbreviated journal references, diameters, distances and color indices of the associations, number of stars and spectral types of the stars in the associations, and identification of the Palomar Observatory Sky Survey Chart on which the association appears.
14565. Star Clusters & Associations II. Globular Clusters
ID:
ivo://CDS.VizieR/VII/44B
Title:
Star Clusters & Associations II. Globular Clusters
Short Name:
VII/44B
Date:
21 Oct 2021
Publisher:
CDS
Description:
The catalog is the complete bibliographical listing for globular clusters from the second edition of the "Catalogue of Star Clusters and Associations (CSCA)" edited by Alter et al. (1970), and the "Supplement to the CSCA" by Ruprecht et al. (1981). Thus, it covers the literature through 1973. The file "main" contains the original data: for each cluster, the first line contains the running number (GCL) followed by designations used by various authors; the second line contains the 1950 coordinates, the 50-yr precession, the galactic coordinates, the galactic direction cosines and the position on the POSS charts; the lines following provide the following parameters: YEAR: Year of the literature reference NAME: Author PUBLICATION: Reference AD: Apparent diameter of the cluster (arcmin) DIST: Distance of the cluster (pc) LD: Linear diameter of the cluster (pc) N: Number of stars studied CE: Color excess SP: Integrated spectrum RV: Radial velocity (km/s) MT: Total (integrated) magnitude NOTE: Notes The file "clusters" has been created from second lines; missing positions were filled with the help of the SIMBAD data-base <http://cdsweb.u-strasbg.fr/Simbad/html>.
14566. Star Clusters/Associations. III. Open Clusters
ID:
ivo://CDS.VizieR/VII/101A
Title:
Star Clusters/Associations. III. Open Clusters
Short Name:
VII/101A
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalogue includes the Open Clusters of the supplement up to 1973 of the "Catalogue of Star Clusters and Associations" by Alter G., Ruprecht J., Vanysek V., Budapest 1970. The file "main.dat" contains the original data. For each cluster, the first line contains the running number (OCL) followed by various designations. The first five figures represent the galactic longitude (in 0.01degree), 'N' or 'S' for North or South galactic hemisphere, and galactic latitude (in 0.01degree). The second line contains the 1950 coordinates, the 50-yr precession, the galactic direction cosines and the position on the POSS charts. For each cluster a number of bibliographic records follow containing: YEAR: Year of the literature reference NAME: Author PUBLICATION: Reference AD: Angular diameter of the cluster in arc minutes DIST: Distance of the cluster (pc) LD: Linear diameter of the cluster (pc) N: Number of stars studied CI: Color index SP: Spectra P: Positions RV: Radial velocity (km/s) MT: Integrated magnitude NOTE: Notes The file "clusters" has been created from first and second lines; missing equatorial coordinates were derived from the galactic ones.
14567. Star clusters automatically detected in the LMC
ID:
ivo://CDS.VizieR/J/ApJ/845/56
Title:
Star clusters automatically detected in the LMC
Short Name:
J/ApJ/845/56
Date:
21 Oct 2021
Publisher:
CDS
Description:
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 simulations to define stellar overdensities in the data. It decontaminates the cluster color-magnitude diagrams and, using a revised version of the Bayesian isochrone fitting code of Ramirez-Siordia+ (2017, in prep.), estimates the ages of the clusters. Comparisons of our estimates with those from other surveys show the superiority of our method to extract and measure the ages of star clusters, even in the most crowded fields. An application of our method is shown for the high-resolution, multiband imaging of the Large Magellanic Cloud. We detect 4850 clusters in the 7deg^2^ we surveyed, 3451 of which have not been reported before. Our findings suggest multiple epochs of star cluster formation, with the most probable occurring ~310Myr ago. Several of these events are consistent with the epochs of the interactions among the Large and Small Magellanic Clouds, and the Galaxy, as predicted by N-body numerical simulations. Finally, the spatially resolved star cluster formation history may suggest an inside-out cluster formation scenario throughout the LMC, for the past 1Gyr.
14568. Star clusters distances and extinctions
ID:
ivo://CDS.VizieR/J/MNRAS/436/1465
Title:
Star clusters distances and extinctions
Short Name:
J/MNRAS/436/1465
Date:
21 Oct 2021
Publisher:
CDS
Description:
Determining star cluster distances is essential to analyse their properties and distribution in the Galaxy. In particular, it is desirable to have a reliable, purely photometric distance estimation method for large samples of newly discovered cluster candidates e.g. from the Two Micron All Sky Survey, the UK Infrared Deep Sky Survey Galactic Plane Survey and VVV. Here, we establish an automatic method to estimate distances and reddening from near-infrared photometry alone, without the use of isochrone fitting. We employ a decontamination procedure of JHK photometry to determine the density of stars foreground to clusters and a galactic model to estimate distances. We then calibrate the method using clusters with known properties. This allows us to establish distance estimates with better than 40 percent accuracy. We apply our method to determine the extinction and distance values to 378 known open clusters and 397 cluster candidates from the list of Froebrich, Scholz & Raftery (2007MNRAS.374..399F, Cat. J/MNRAS/374/399). We find that the sample is biased towards clusters of a distance of approximately 3kpc, with typical distances between 2 and 6kpc. Using the cluster distances and extinction values, we investigate how the average extinction per kiloparsec distance changes as a function of the Galactic longitude. We find a systematic dependence that can be approximated by A_H_(l)[mag/kpc]=0.10+0.001x|l-180{deg}|/{deg} for regions more than 60{deg} from the Galactic Centre.
14569. Star clusters distances and extinctions. II.
ID:
ivo://CDS.VizieR/J/MNRAS/444/290
Title:
Star clusters distances and extinctions. II.
Short Name:
J/MNRAS/444/290
Date:
21 Oct 2021
Publisher:
CDS
Description:
Until now, it has been impossible to observationally measure how star cluster scaleheight evolves beyond 1Gyr as only small samples have been available. Here, we establish a novel method to determine the scaleheight of a cluster sample using modelled distributions and Kolmogorov-Smirnov tests. This allows us to determine the scaleheight with a 25% accuracy for samples of 38 clusters or more. We apply our method to investigate the temporal evolution of cluster scaleheight, using homogeneously selected sub-samples of Kharchenko et al. (MWSC, 2012, Cat. J/A+A/543/A156, 2013, J/A+A/558/A53 ), Dias et al. (DAML02, 2002A&A...389..871D, Cat. B/ocl), WEBDA, and Froebrich et al. (FSR, 2007MNRAS.374..399F, Cat. J/MNRAS/374/399). We identify a linear relationship between scaleheight and log(age/yr) of clusters, considerably different from field stars. The scaleheight increases from about 40pc at 1Myr to 75pc at 1Gyr, most likely due to internal evolution and external scattering events. After 1Gyr, there is a marked change of the behaviour, with the scaleheight linearly increasing with log(age/yr) to about 550pc at 3.5Gyr. The most likely interpretation is that the surviving clusters are only observable because they have been scattered away from the mid-plane in their past. A detailed understanding of this observational evidence can only be achieved with numerical simulations of the evolution of cluster samples in the Galactic disc. Furthermore, we find a weak trend of an age-independent increase in scaleheight with Galactocentric distance. There are no significant temporal or spatial variations of the cluster distribution zero-point. We determine the Sun's vertical displacement from the Galactic plane as Z_{sun}_=18.5+/-1.2pc.
14570. Star clusters in IC 10
ID:
ivo://CDS.VizieR/J/ApJ/804/123
Title:
Star clusters in IC 10
Short Name:
J/ApJ/804/123
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a survey of star clusters in the halo of IC 10, a starburst galaxy in the Local Group, based on Subaru R-band images and NOAO Local Group Survey UBVRI images. We find five new star clusters. All of these star clusters are located far from the center of IC 10, while previously known star clusters are mostly located in the main body. Interestingly, the distribution of these star clusters shows an asymmetrical structure elongated along the east and southwest directions. We derive UBVRI photometry of 66 star clusters, including these new star clusters, as well as previously known star clusters. Ages of the star clusters are estimated from a comparison of their UBVRI spectral energy distribution with the simple stellar population models. We find that the star clusters in the halo are all older than 1Gyr, while those in the main body have various ages, from very young (several Myr) to old (>1Gyr). The young clusters (<10Myr) are mostly located in the H{alpha} emission regions and are concentrated on a small region at 2" in the southeast direction from the galaxy center, while the old clusters are distributed in a wider area than the disk. Intermediate-age clusters (~100 Myr) are found in two groups. One is close to the location of the young clusters and the other is at ~ 4" from the location of the young clusters. The latter may be related to past mergers or tidal interaction.

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