Automated search for star clusters in large multiband surveys: II. Discovery and investigation of open clusters in the galactic plane

Glushkova, E. V.; Koposov, S. E.; Zolotukhin, I.; Beletsky, Yu. V.; Vlasov, A. D.; Leonova, S. I.

doi:10.1134/s1063773710020015

Cited by 56 publications

(53 citation statements)

References 8 publications

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“…The follow-up studies compiled by Froebrich et al (2008) also unveil 22 spurious clusters and one globular cluster (see Table A.1). A similar automatic 2MASS search done by Glushkova et al (2010) in the |b| < 24 • range, which includes the verification of the obtained star density enhancements by the analysis of color-magnitude diagrams and radial density distributions, produced a list of ∼100 new clusters (most of them included in the last version of the catalog by Dias et al 2002), providing physical parameters for a total of 168 new and previously discovered objects.…”

Section: A2 Nir Clustersmentioning

confidence: 99%

“…• NIR isochrone fitting (e.g., Tadross 2008;Glushkova et al 2010): we adopted the same minimum distance error as for optical isochrone fitting, 15%. Extinction law variations might be present, but since the type of clusters for which isochrone fitting is possible are not severely extinguished (they are generally not young), the corresponding uncertainty in A K due to these variations is also low (recall σ(A K ) 0.2 A K ).…”

Section: B5 Stellar Distance and Agementioning

confidence: 99%

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Stellar clusters in the inner Galaxy and their correlation with cold dust emission

Morales

Wyrowski

Schüller

et al. 2013

A&A

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Context. Stars are born within dense clumps of giant molecular clouds, and constitute young stellar agglomerates known as embedded clusters, which only evolve into bound open clusters under special conditions. Aims. We statistically study all embedded clusters (ECs) and open clusters (OCs) known so far in the inner Galaxy, in particular investigating their interaction with the surrounding molecular environment and the differences in their evolution. Methods. We first compiled a merged list of 3904 clusters from optical and infrared cluster catalogs in the literature, including 75 new (mostly embedded) clusters discovered by us in the GLIMPSE survey. From this list, 695 clusters are within the Galactic range | | ≤ 60 • and |b| ≤ 1.5 • covered by the ATLASGAL survey, which was used to search for correlations with submm dust continuum emission tracing dense molecular gas. We defined an evolutionary sequence of five morphological types: deeply embedded cluster (EC1), partially embedded cluster (EC2), emerging open cluster (OC0), OC still associated with a submm clump in the vicinity (OC1), and OC without correlation with ATLASGAL emission (OC2). Together with this process, we performed a thorough literature survey of these 695 clusters, compiling a considerable number of physical and observational properties in a catalog that is publicly available. Results. We found that an OC defined observationally as OC0, OC1, or OC2 and confirmed as a real cluster is equivalent to the physical concept of OC (a bound exposed cluster) for ages in excess of ∼16 Myr. Some observed OCs younger than this limit can actually be unbound associations. We found that our OC and EC samples are roughly complete up to ∼1 kpc and ∼1.8 kpc from the Sun, respectively, beyond which the completeness decays exponentially. Using available age estimates for a few ECs, we derived an upper limit of 3 Myr for the duration of the embedded phase. Combined with the OC age distribution within 3 kpc of the Sun, which shows an excess of young exposed clusters compared to a theoretical fit that considers classical disruption mechanisms, we computed an embedded and young cluster dissolution fraction of 88 ± 8%. This high fraction is thought to be produced by several factors and not only by the classical paradigm of fast gas expulsion.

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Section: A2 Nir Clustersmentioning

confidence: 99%

Section: B5 Stellar Distance and Agementioning

confidence: 99%

Stellar clusters in the inner Galaxy and their correlation with cold dust emission

Morales

Wyrowski

Schüller

et al. 2013

A&A

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“…Around 1300 clusters, mainly in the infrared have been discovered through automatic or semi-automatic searches of large scale survey data products from DSS, 2MASS, DENIS and GLIMPSE (e.g. Bica et al 2003;Mercer et al 2005;Froebrich et al 2007a;Glushkova et al 2010). Expectations are that the new generation of all sky surveys (UKIDSS, the VISTA-based VHS and VVV, and Gaia) will add many more.…”

Section: Introductionmentioning

confidence: 99%

New Galactic star clusters discovered in the VVV survey

Borissova

Bonatto

Kurtev

et al. 2011

A&A

108

170

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Context. VISTA Variables in the Vía Láctea (VVV) is one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV is scanning the Milky Way bulge and an adjacent section of the disk, where star formation activity is high. One of the principal goals of the VVV Survey is to find new star clusters of different ages. Aims. In order to trace the early epochs of star cluster formation we concentrated our search in the directions to those of known star formation regions, masers, radio, and infrared sources. Methods. The disk area covered by VVV was visually inspected using the pipeline processed and calibrated K S -band tile images for stellar overdensities. Subsequently, we examined the composite JHK S and Z JK S color images of each candidate. PSF photometry of 15 × 15 arcmin fields centered on the candidates was then performed on the Cambridge Astronomy Survey Unit reduced images. After statistical field-star decontamination, color-magnitude and color-color diagrams were constructed and analyzed. Results. We report the discovery of 96 new infrared open clusters and stellar groups. Most of the new cluster candidates are faint and compact (with small angular sizes), highly reddened, and younger than 5 Myr. For relatively well populated cluster candidates we derived their fundamental parameters such as reddening, distance, and age by fitting the solar-metallicity Padova isochrones to the color-magnitude diagrams.

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“…Kharchenko et al 2005Kharchenko et al , 2013Bukowiecki et al 2011;Glushkova et al 2010;Loktin et al 2001;Tadross 2011). The goals of these studies are obvious: first to provide large samples of clusters with homogeneous fundamental parameters, and, second, eventually to use these samples to probe the properties of the Galactic thin disk, where most open clusters reside, and/or of the open cluster population as a whole.…”

Section: Introductionmentioning

confidence: 99%

On the assessment of the nature of open star clusters and the determination of their basic parameters with limited data

Carraro

Baume

Seleznev

et al. 2017

Astrophys Space Sci

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Our knowledge of stellar evolution and of the structure and chemical evolution of the Galactic disk largely builds on the study of open star clusters. Because of their crucial role in these relevant topics, large homogeneous catalogues of open cluster parameters are highly desirable. Although efforts have been made to develop automatic tools to analyse large numbers of clusters, the results obtained so far vary from study to study, and sometimes are very contradictory when compared to dedicated studies of individual clusters. In this work we highlight the common causes of these discrepancies for some open clusters, and show that at present dedicated studies yield a much better assessment of the nature of star clusters, even in the absence of ideal data-sets. We make use of deep, widefield, multi-colour photometry to discuss the nature of six strategically selected open star clusters: Trumpler 22, Lynga 6, Hogg 19, Hogg 21, Pismis 10 and Pismis 14. We have precisely derived their basic parameters by means of a combination of star counts and photometric diagrams. Trumpler 22 and Lynga 6 are included in our study because they are widely known, and thus provided a check of our data and methodology. The remaining four clusters are very poorly known, and

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Automated search for star clusters in large multiband surveys: II. Discovery and investigation of open clusters in the galactic plane

Cited by 56 publications

References 8 publications

Stellar clusters in the inner Galaxy and their correlation with cold dust emission

Stellar clusters in the inner Galaxy and their correlation with cold dust emission

New Galactic star clusters discovered in the VVV survey

On the assessment of the nature of open star clusters and the determination of their basic parameters with limited data

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