The Clusters of M 33

Metallicity Estimates for Old Star Clusters in M 33

Using the theoretical stellar population synthesis models of BC96, Kong et al. (2003) showed that some BATC colors and color indices could be used to disentangle the age and metallicity effect. They found that there is a very good relation between the flux ratio of L8510/L9170 and the metallicity for stellar populations older than 1 Gyr. In this paper, based on the Kong et al. results and on th...

O-33: Serum Anti-M

Identification and photometry of globular clusters in M 31 and M 33 galaxies

We have used the data from the DIRECT project to search for new globular cluster candidates in the M31 and M33 galaxies. We have found 67 new objects in M31 and 35 in M33 and confirmed 38 and 16 previously discovered ones. A V I and BV I photometry has been obtained for all the clusters in M31 and M33 respectively. Luminosity functions have been constructed for the clusters in each galaxy and c...

HST - WFPC 2 Observations of the Star Clusters in the Giant HII Regions of M 33

We present a photometric study of the stars in ionizing star clusters embedded in several giant HII regions of M33 (CC93, IC 142, NGC 595, MA2, NGC 604 and NGC 588). Our photometry are based on the HST-WFPC2 images of these clusters. Color-magnitude diagrams and color-color diagrams of these clusters are obtained and are used for estimating the reddenings and ages of the clusters. The luminosit...

Why do Bimetallic Clusters have more Chemical Reactivity? Study the VnNim (2 ≤ n + m ≤ 6) Clusters as the Nano Species

This article gives you proof that bimetallic transition metal clusters with the difference in electronegativity are better catalysts than monoatomic one. To prove this fact, a study of ethylene adsorption on bimetallic clusters vanadium-nickel VnNim (2≤n+m≤6) has been demonstrated. Our result shows that hardness has a quite good linear correlation with the non-Lewis of VnNi (n=1-5) cluster (R2=...