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Browsing by Author "Bhatt, H. C"

Browsing by Author "Bhatt, H. C"

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  • Kinematical distances to open star clusters 
    Sagar, R; Bhatt, H. C (Indian Academy Sciences, 1988-06)
    Kinematical distances are estimated for six open star clusters. They agree fairly well with the photometric distances. The kinematical distances cannot, at present, be estimated better than the photometric distances. When ...
  • Kinematics of the young stellar objects associated with the cometary globules in the Gum Nebula 
    Choudhury, R; Bhatt, H. C (Royal Astronomical Society, 2009-03)
    An analysis of the proper motion measurements of the young stellar objects (YSOs) associated with the cometary globules (CGs) in the Gum Nebula is presented. While earlier studies based on the radial-velocity measurements ...
  • Kinematics of Vega-like stars 
    Manoj, P; Bhatt, H. C (Astronomical Society of India, 2001)
    We have studied the kinematics of Vega-like stars in the solar neighbourhood. Space velocities are computed for 80 Vega-like stars. We analyse the space velocities of these stars in connection with the young stellar ...
  • Kinematics of Vega-like stars: Lifetimes and temporal evolution of circumstellar dust disks 
    Manoj, P; Bhatt, H. C (EDP Sciences, 2005-01)
    We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use ...
  • Large dust grains in the dark cloud B5 
    Bhatt, H. C (Royal Astronomical Society, 1986-09)
    Polarization measurements of stars in the region of the dark cloud B5 indicate that the average dust grain size in the cloud is much larger than the mean interstellar grain size. Within the cloud, the average grain size ...
  • Magnetic field structure around cores with very low luminosity objects 
    Soam, A; Maheswar, G; Lee, C. W; Dib, S; Bhatt, H. C; Tamura, M; Kim, G (EDP Sciences, 2015-01)
    Aims. We carried out optical polarimetry of five dense cores, (IRAM 04191, L1521F, L328, L673-7, and L1014) which are found to harbour very low luminosity objects (VeLLOs; Lint ≲ 0.1 L⊙). This study was conducted mainly ...
  • Magnetic fields in cometary globules - II. CG 30-31 complex 
    Bhatt, H. C (The Royal Astronomical Society, 1999-09)
    Optical linear polarization measurements of stars in the region of the cometary globules CG 30-31 in Vela-Puppis are presented. A polarization map representing the geometry of the magnetic field in the cometary globule ...
  • Magnetic fields in cometary globules - III. CG 12 
    Bhatt, H. C; Maheswar, G; Manoj, P (Royal Astronomical Society, 2004-02-11)
    We present results of optical linear polarization measurements of stars in the region of the relatively isolated cometary globule CG 12 in Centaurus at a galactic latitude b~= 21°. A polarization map representing the ...
  • Magnetic fields in cometary globules – IV. LBN 437 
    Soam, A; Maheswar, G; Bhatt, H. C; Won Lee, C; Ramaprakash, A. N (Oxford University Press on behalf of the Royal Astronomical Society, 2013-06-21)
    We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, ℓ = 96°, b = −15°), to study the magnetic field geometry of the cloud. We estimated a distance of 360 ± 65 pc to LBN 437 (also one ...
  • Magnetic fields in cometary globules. I. CG 22 
    Sridharan, T. K; Bhatt, H. C; Rajagopal, J (Royal Astronomical Society, 1996-04)
    We report first results from a program to study magnetic fields in cometary globules (CGs). These are clouds near massive stars showing a head-tail morphology. Linear optical polarization measurements on stars seen projected ...
  • Measurements of linear polarization of some Herbig Ae/Be stars 
    Jain, S. K; Bhatt, H. C; Sagar, R (The American Physical Society, 1990-05)
    The linear polarization of eight bright Herbig Ae/Be stars in UBVRI bands has been measured. No unique wavelength dependence of polarization magnitude or direction is found in these measurements. Comparison with earlier ...
  • A method to determine distances to molecular clouds using near-IR photometry 
    Maheswar, G; Lee, C. W; Bhatt, H. C; Mallik, S. G. V; Dib, S (EDP Sciences, 2010-01)
    We aim to develop a method to determine distances to molecular clouds using JHK near-infrared photometry. Methods: The method is based on a technique that aids spectral classification of stars lying towards the fields ...
  • A new look at the OB associations and star clusters in the Puppis-Vela region using HIPPARCOS data 
    Subramaniam, A; Bhatt, H. C (Astronomical Society of India, 2000)
    The Puppis-Vela region contains a few OB associations and young star clusters which are the imprints of recent star formation. As this region comprises of many star clusters in the line of sight, accurate distance and ...
  • Non-emission-line young stars of intermediate mass 
    Manoj, P; Maheswar, G; Bhatt, H. C (Blackwell Publishing Ltd, 2002-08)
    We present optical spectra of four intermediate-mass candidate young stellar objects that have often been classified as Herbig Ae/Be stars. Typical Herbig Ae/Be emission features are not present in the spectra of these ...
  • On the evolution of irradiated turbulent clouds: a comparative study between modes of triggered star formation 
    Anathpindika, S; Bhatt, H. C (Wiley-Blackwell, 2012-12)
    Gas within molecular clouds (MCs) is turbulent and unevenly distributed. Interstellar shocks such as those driven by strong fluxes of ionizing radiation (IR) profoundly affect MCs. While small dense MCs exposed to a strong ...
  • On the interaction of a thin, supersonic shell with a molecular cloud 
    Anathpindika, S; Bhatt, H. C (Wiley-Blackwell, 2011-04)
    Molecular Clouds (MCs) are stellar nurseries; however, formation of stars within MCs depends on the ambient physical conditions. MCs, over a free-fall time, are exposed to numerous dynamical phenomena, of which, the ...
  • Oort and the comets 
    Bhatt, H. C (Indian Academy of Sciences, 1993-07-25)
  • Optical CCD imaging of some Herbig Ae/Be stars 
    Bhatt, H. C; Sagar, R (EDP Sciences, 1992-02)
    Results of V, R, and H-alpha CCD imaging for 15 Herbig Ae/Be stars are presented. Light variations of more than about 2 mag in V have been noticed in stars T Ori, RR Tau, and LH-alpha 25. The nature of the variations in ...
  • Optical spectroscopic and 2MASS measurements of Stephenson Halpha stars 
    Maheswar, G; Manoj, P; Bhatt, H. C (European Southern Observatory, 2003-05)
    We present the results of spectroscopic observations for 52 objects from the list of Halpha emission stars of Stephenson (\cite{Ste86}). Out of six known T Tauri stars observed, five showed Halpha in emission and in one ...
  • Orbital decay of protostellar binaries in molecular clouds 
    Gorti, U; Bhatt, H. C (Royal Astronomical Society, 1996-11)
    The evolution of protostellar binary system is investigated while it is embedded in its parent molecular cloud core and is acted upon by gas drag as a result of dynamical friction. Approximate analytical results are obtained ...

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