Abstract Reliable fundamental parameters of star clusters such as distance modulus, metallicity, age, extinction, and binary fraction are key importance for astrophysical studies. Although a lot new were identified from the data of, e.g., Gaia Data Release 2 (Gaia DR2), many not determined reliably. This work makes use photometry DR2 good color–magnitude diagram (CMD) analysis tool, Powerful CM...

We studied the normal spread of excitation on the anterior and posterior ventricular surface of open-chest dogs by recording unipolar electrograms from an array of 1124 electrodes spaced 2 mm apart. The array had the shape of the ventricular surface of the heart. The electrograms were processed by a computer and displayed as epicardial equipotential maps at 1-msec intervals. Isochrone maps also...

We report on HST/ACS photometry of the rich intermediate-age star cluster NGC 1846 in the Large Magellanic Cloud, which clearly reveals the presence of a double main sequence turn-off in this object. Despite this, the main sequence, sub-giant branch, and red giant branch are all narrow and well-defined, and the red clump is compact. We examine the spatial distribution of turn-off stars and demo...

We have obtained Keck HIRES spectra of 35 objects in the preÈmain-sequence cluster NGC 2264 in order to determine their radial velocities, rotation rates, activity levels, and Li abundances. Our precise radial velocities indicate that the eight objects we observed that lie below a 5 Myr isochrone are nonmembers. This means that the age spread within NGC 2264 is only about 4 Myr, a factor of 2 l...

The B,V CCD photometry of 916 stars in the field of the high galactic latitude intermediate age open cluster NGC 1245 is presented. The cluster parameters were estimated with the help of V vs (B−V) colour magnitude diagram (CMD). After correcting for intra-cluster reddening, the mean redding towards the cluster was found to be 0.29±0.05 mag, with a distance modulus (m−M)0 equal to 12.4±0.3 mag....

We present 1 and 100MHz ground-based radar data from the onset region of Rutford Ice Stream, West Antarctica, which indicate the form and internal structure of isochrones. In the flowparallel lines, modelled isochrone patterns reproduce the gross pattern of the imaged near-surface layers, assuming steady-state flow velocity from GPS records and the current accumulation rate for the last 200 yea...

We present a statistical approach for determining the age of Globular Clusters (GCs) that allows estimating the age derived from CMDs more accurately than the conventional methods of the isochrone fitting. We measure how closely a set of synthetic CMDs constructed from different evolutionary models resemble the observed ones by determining the likelihood using Saha and χ2 statistics. The model ...

An isochrone in a spatial network is the minimal, possibly disconnected subgraph that covers all locations from where a query point is reachable within a given time span and by a given arrival time [5]. A novel approach for computing isochrones in multimodal spatial networks is presented in this paper. The basic idea of this incremental calculation is to reuse already computed isochrones when a...

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, a...

Canis Major OB1 (CMa OB1) is a Galactic stellar association with very intriguing star-formation scenario. There are more than two dozen known star clusters in its line of sight, but it not clear which ones physically associated CMa OB1. We use clustering code that employs 5-dimensional data from the Gaia DR2 catalogue to identify physical groups and obtain their astrometric parameters and, addi...