An impressive variety of recent observations which include luminosity evolutions of high red shift supernovae strongly suggest that the cosmological constant (/\)is not zero. Even though the /\-term may dominate cosmic ...

We present here preliminary results obtained form some simulation and experimental investigations on the polarization state of atmospheric Cerenkov events.

Lunar occultaion in the near infrared has been demonstrated by the PRL group to be an effective method of determining the angular size (in milliarcsecond range)and accurate effective temperature of red giants, supergiants ...

The night time variation of the Fried's parameter, r lower script o is measured on 28-29 March 1991, at the Cassegrain focus of 2.34 m Vainu Bappu Telescope (VBT), at Vainu Bappu Observatory (VBO), Kavalur, India, using ...

An interrupt-driven distributed Data AcQuisition and Control System (DAQCS) has been developed for the Imaging Element of the 4-element gamma-ray telescope array, TACTIC. A network of PCs, running the QNX RTOS, have been ...

Comprehensive simulation studies, using the CORSIKA air-shower code are in progress to predict and optimize the performance of the TACTIC gamma-ray telescope array. Preliminary results are presensted here on the gamma-ray ...

We present here some salient features of the hardware and software aspects of the 2-axes drive system developed for the TACTIC γ-ray telescope array. A test-report of its performance is also presented

The Indian X-ray Astronomy Experiment(IXAE) is currently in operation on-board the IRS-P3 satellite launched by the PSLV-D3 rocket in 1996 March 21. Based on IXAE observations, several interesting results have been obtained ...

Early-type galaxies with large-scale dust are suitable objects to investigate the propeties of dust extinction in extragalactic environments because the underlying galaxies have fairly smooth distribution of the starlight. ...