Navegação Ciências Exatas e da Terra por Assunto "Open clusters and associations: general"
Resultados 1-20 de 45
-
Anchoring the distence scale via x-ray/infrared data for Cepheid clusters : SU Cas
(2012) [Artigo de periódico]New X-ray (XMM-Newton) and JHKs (Observatoire du Mont-Mégantic) observations for members of the star cluster Alessi 95, which Turner et al. discovered hosts the classical Cepheid SU Cas, were used in tandem with UCAC3 ... -
Characterization of 15 overlooked Ruprecht clusters with ages within 400 Myr and 3Gyr
(2010) [Artigo de periódico]We derive fundamental, structural and photometric parameters of 15 overlooked Ruprecht (hereafter Ru) star clusters by means of Two-Micron All-Sky Survey photometry and fieldstar decontamination. Ru 1, 10, 23, 26, 27, 34, ... -
Characterizing star cluster formation with WISE : 652 newly found star clusters and candidates
(2016) [Artigo de periódico]We report the discovery of 652 star clusters, stellar groups and candidates in the Milky Way with Wide-field Infrared Survey Explorer (WISE). Most of the objects are projected close to Galactic plane and are embedded ... -
Colour-magnitude analysis of five old open clusters
(2005) [Artigo de periódico]The Galileo Telescope was used to carry out BV photometry of five faint open clusters, for which no Colour Magnitude Diagrams were available in the literature. The clusters Berkeley 24, Berkeley 35, Berkeley 78, PWM 1, and ... -
Constraining the star formation rate in the solar neighbourhood with star clusters
(2011) [Artigo de periódico]This paper investigates the star formation rate (SFR) in the solar neighbourhood. First, we build the local age distribution function (ADF) with an updated sample of 442 star clusters located at less than 1 kpc from the ... -
Deriving reliable fundamental parameters of pre-main-sequence-rich star clusters affected by differential reddening
(2012) [Artigo de periódico]We present an approach that improves the search for reliable astrophysical parameters (e.g. age, mass and distance) of differentially reddened, pre-main-sequence-rich star clusters. It involves simulating conditions related ... -
Detailed analysis of open clusters : a mass function break and evidence of a fundamental plane
(2005) [Artigo de periódico]We derive photometric, structural and dynamical evolution-related parameters of 11 nearby open clusters with ages in the range 70 Myr to 7 Gyr and masses in the range ≈400 Mʘ to ≈5300 Mʘ. The clusters are homogeneously ... -
Discovery of an open cluster with a possible physical association with a planetary nebula
(2008) [Artigo de periódico]We report the discovery of a new open cluster (OC) in the Galaxy at l = 167◦ 0 and b = −1◦ 0. Its field includes the planetary nebula (PN) PK 167−0.1. We study the possible associations of the PN/OC pairs NGC2818/2818A, ... -
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8
(2015) [Artigo de periódico]Molecular clouds at very high latitude (b > 60°) away from the Galactic plane are rare and in general are expected to be non-star-forming. However, we report the discovery of two embedded clusters (Camargo 438 and Camargo ... -
Does Cyg OB2 harbour any open cluster?
(2003) [Artigo de periódico]We report the detection of three new open cluster candidates located in Cygnus. Two of them are projected near the center of the rich compact association CygOB2. These two objects have been found during an optical inspection ... -
Extracting parameters from colour–magnitude diagrams
(2015) [Artigo de periódico]We present a simple approach for obtaining robust values of astrophysical parameters from the observed colour–magnitude diagrams (CMDs) of star clusters. The basic inputs are the Hess diagram built with the photometric ... -
Faint open clusters with 2MASS : BH 63, Lynga 2, Lynga 12 and King 20
(2006) [Artigo de periódico]Context. Structural and dynamical parameters of faint open clusters are probed with quality 2MASS-photometry and analytical procedures developed for bright clusters. Aims. We derive fundamental parameters of the faint open ... -
From proper motions to star cluster dynamics : measuring the velocity dispersion in deconvolved distribution functions
(2011) [Artigo de periódico]We investigate the effect that the usually large errors associated with ground-based proper motion (PM) components have on the determination of a star cluster’s velocity dispersion (σv). Rather than histograms, we work ... -
Fundamental parameters of the moderately young open clusters NGC 5999, NGC 6031, Ruprecht 115 and Ruprecht 120
(1999) [Artigo de periódico]We present CCD BVI Johnson–Cousins photometry for the southern open clusters NGC 5999, NGC 6031, Ruprecht 115 and Ruprecht 120. The sample consists of about 1160 stars reaching down to V ~ 19 mag. From the analysis of the ... -
Integrated spectral evolution of Galactic open clusters
(2002) [Artigo de periódico]We present a library of 47 open-cluster integrated spectra, mostly obtained at CASLEO (San Juan, Argentina) in the range 3600<λ<7400 Å, which are made available at CDS. The data are combined with previous spectra to obtain ... -
Integrated spectral properties of 22 small angular diameter galactic open clusters
(2007) [Artigo de periódico]Aims. Flux-calibrated integrated spectra of a sample of 22 Galactic open clusters of small angular diameter are presented. With one exception (ESO429-SC2), all objects have Galactic longitudes in the range 208° < l < 33°. ... -
Investigating potential planetary nebula/cluster pairs
(2014) [Artigo de periódico]Context. Fundamental parameters characterizing the end-state of intermediate-mass stars may be constrained by discovering planetary nebulae (PNe) in open clusters (OCs). Cluster membership may be exploited to establish the ... -
Investigating the age and structure of the infrared old open clusters LK 1, LK 10, FSR 1521 and FSR 1555
(2009) [Artigo de periódico]The combination of several mass-decreasing processes may critically affect the structure of open clusters (OCs), to the point that most dissolve into the field in a time-scale shorter than ≈1 Gyr. Therefore, as is observed, ... -
Investigating the boderline between a young star cluster and a small stellar association : a test case with Bochum 1
(2008) [Artigo de periódico]Context. Usually, a loose stellar distribution can be classified as an OB stellar group, an association, or a young open cluster. We compare data with the typical OB association Vul OB1. Aims. Here, we discuss the nature ... -
Massive open star clusters using the VVV survey : II. Discovery of six clusters with Wolf-Rayet stars
(2013) [Artigo de periódico]Context. The ESO Public Survey “VISTA Variables in the Vía Láctea” (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Nearly ...
