Annapurni Subramaniam

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The stellar population and star clusters around six regions in the Large Magellanic Cloud (LMC) is studied to understand the correlation between star formation and cluster formation rates. We used the stellar data base of the OGLE II LMC survey and the star cluster catalogues. The observed distribution of stellar density on the colour-magnitude diagrams(More)
The Thirty Meter Telescope (TMT) first light instrument IRIS (Infrared Imaging Spectrograph) will complete its preliminary design phase in 2016. The IRIS instrument design includes a near-infrared (0.85 2.4 micron) integral field spectrograph (IFS) and imager that are able to conduct simultaneous diffraction-limited observations behind the advanced adaptive(More)
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(More)
Emission-line stars in young open clusters are identified to study their properties, as a function of age, spectral type and their evolutionary state. 207 open star clusters were observed using slitless spectroscopy method and 157 emission stars were identified in 42 clusters. We have found 54 new emission-line stars in 24 open clusters, out of which 19(More)
Aims. The distribution of RR Lyrae stars (RRLS) in the inner Large Magellanic Cloud (LMC), and the structure of the halo of the LMC delineated by these stars are studied here. Methods. RRLS identified by the OGLE II survey are used to estimate their number density distribution in the bar region of the LMC. To find their location, I estimated the(More)
The purpose of the Observatory Software System (OSW) is to integrate all software and hardware components of the Thirty Meter Telescope (TMT) to enable observations and data capture; thus it is a complex software system that is defined by four principal software subsystems: Common Software (CSW), Executive Software (ESW), Data Management System (DMS) and(More)
UNLABELLED The configurational force experienced by a dislocation towards a free-surface is termed as the image force. In this work we consider a combination of two cases, wherein the image force experienced by an edge dislocation is considerably altered with respect to an edge dislocation in a semi-infinite body: (i) interfacial misfit edge dislocation in(More)
We present UBV RI CCD photometry in the region of the open clusters NGC 637 and NGC 957. The radii are found to be 4.2 and 4.3. Their reddenings E(B − V ) are 0.64 ± 0.05 mag and 0.71 ± 0.05 mag and their distances, from main sequence fitting are 2.5±0.2 kpc and 2.2±0.2 kpc. Comparison with Z = 0.02 isochrones leads to an age of 10 ± 5 Myr for both(More)