A5022464549- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Advanced Algebra and Geometry
- History and Developments in Astronomy
- Advanced Topics in Algebra
Universidade de São Paulo
2001-2012
Valongo Observatory
2006
We have compiled a new catalogue of open clusters in the Galaxy which updates previous catalogues Lyngå ([CITE]) and Mermilliod (included WEBDA database). New objects data, particular, data on kinematics (proper motions) that were not present old catalogues, been included. Virtually all (1537) presently known included, represents an increment about 347 relative to catalogue. The is presented single table containing important makes it easy use. can be accessed line either at...
In this study we follow up our recent paper (Monteiro et al. 2020) and present a homogeneous sample of fundamental parameters open clusters in Galaxy, entirely based on Gaia DR2 data. We used published membership probability the stars derived from data applied isochrone fitting code, updated as Monteiro (2020), to GB GR for member stars. doing take into account nominal errors derive distance, age, extinction each cluster. This work therefore provides 1743 and, byproduct, list likely not...
An inspection of the DSS and 2MASS images selected Milky Way regions has led to discovery 66 stellar groupings whose morphologies, color–magnitude diagrams, density distributions suggest that these objects are possible open clusters do not yet appear be listed in any catalogue. For 24 groupings, which we consider most likely candidates, provide extensive descriptions on basis photometry their visual impression 2MASS. Of cluster 9 have fundamental parameters determined by fitting diagrams...
We present the kinematics of hundreds open clusters, based on UCAC2 Catalogue positions and proper motions. Membership probabilities were obtained for stars in cluster fields by applying a statistical method uses stellar All clusters with known distance investigated, 75 this is first determination mean motion. The results, including DSS images cluster's kinematic members marked, are incorporated Open Clusters supported line our group.
We present mean absolute proper motions of 112 open clusters, determined using the data from Tycho2 Catalogue. For 28 this is first determination motion. The measurements made use a large number stars (usually several tens) for each cluster. total studied in fields 164 clusters 5016, which 4006 were considered members. and membership probability individual obtained motion by applying statistical method proposed Sanders ([CITE]).
We determined the mean absolute proper motion of 94 open clusters situated farther than 1 kpc from Sun. The results are derived stellar data given in Tycho2 Catalogue. and membership probability individual stars were obtained by applying statistical method proposed Sanders ([CITE]). measurements made use a large number stars, usually several tens, for each cluster. total investigated fields is 4864 which 2021 considered members. For 55 clusters, this first determination motion.
The Galactic globular cluster system is incomplete, especially in the low latitude regions of bulge and disk. We report physical characterization twelve star clusters Milky Way, most which are explored here for first time. Our aim determining their main parameters, such as reddening extinction, metallicity, age, total luminosity, mean proper motions (PMs), distances, order to unveil nature. study using optical near-infrared (NIR) datasets. use Gaia Early Data Release 3 (EDR3) PMs perform a...
The parameters for the newly-discovered open cluster Alessi 95 are established on basis of available photometric and spectroscopic data, in conjunction with new observations. Colour excesses spectroscopically-observed B A-type stars near SU Cas follow a reddening relation described by E(U-B)/E(B-V)=0.83+0.02*E(B-V), implying value R=Av/E(B-V)~2.8 associated dust. has mean E(B-V)_(B0)=0.35+-0.02 s.e., an intrinsic distance modulus Vo-Mv=8.16+-0.04 s.e. (+-0.21 s.d.), d=429+-8 pc, estimated...
We present 11 new open cluster candidates found in a systematic search for unknown star clusters using the astrometric and photometric data included Tycho 2 catalog. The possible existence of these stellar aggregates is supported by analysis proper motions, color–magnitude diagrams, density distributions, visual inspection Digitized Sky Survey (DSS) plates. With tools we were able to determine mean absolute motions as well preliminary reddenings, distances ages majority candidates. that most...
We have compiled a new catalogue of open clusters in the Galaxy which updates previous catalogues Lyngå (1987) and Mermilliod (1995) (included WEBDA database). New objects data, particular, data on kinematics (proper motions, radial velocities) that were not present old catalogues, been included. Virtually all (1622) presently known included, represents an increment about 450 relative to catalogue. The is presented single table containing important (positions, reddenings, distances, ages,...
We present the first determination of fundamental parameters (positions, reddenings, distances, ages and kinematics) for a sample 22 open clusters in solar vicinity. A systematic search unknown using astrometric photometric data included Tycho2 catalogue has resulted identification several candidates. In this work, we introduce 11 most promising cluster The reality stellar aggregates is supported by analysis proper motions, colour-magnitude diagrams, density distributions, visual inspection...