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Browsing by Author "Bhatt, H. C"

Browsing by Author "Bhatt, H. C"

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  • 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 ...
  • Photometric distances to dark clouds: cometary globule CG 12 
    Maheswar, G; Manoj, P; Bhatt, H. C (Royal Astronomical Society, 2004-12)
    A method for determining distances to dark clouds and Bok globules based on broad-band optical and near-infrared photometry is presented. In this method, intrinsic colour indices of stars projected towards the direction ...
  • Photometric distances to nine dark globules 
    Maheswar, G; Bhatt, H. C (Blackwell Publishing, 2006-07)
    Distances to nine dark globules are determined by a method using optical (VRI) and near-infrared (near-IR) (JHK) photometry of stars projected towards the field containing the globules. In this method, we compute intrinsic ...
  • Planet formation in sun-like systems 
    Bhatt, H. C (Astronomical Society of India, 1999)
    Recent discoveries of substellar and planetary-mass objects in orbit around other stars represent the most remarkable progress achieved in the search for extrasolar planetary systems. The evidence for their existence is ...
  • Polarisation in A-type stars with circumstellar shells 
    Bhatt, H. C (European Southern Observatory, 1996-12)
    We present the results of optical linear polarisation measurements of about 30 A-type stars that are known to be either Ae/A shell stars or have shown anomalous emission in the infrared. Compared with the general population ...
  • Polarization Maps for the Dark Clouds B:227 and L:121 
    Bhatt, H. C; Jain, S. K (European Southern Observatory, 1993-09)
    Optical linear polarization measurements for stars in the regions of the molecular clouds B 227 and L 121 are presented. The magnetic field geometry in the clouds as indicated by the polarization maps is discussed in ...
  • Polarization Measurements of Some Herbig Ae / Be-Stars 
    Jain, S. K; Bhatt, H. C; Sagar, R (International Astronomical Union, 1990)
    We have measured the linear polarization of 8 bright Herbing Ae/ Be starsin UBVRI bands. No unique wavelength dependence of magnitude as well as direction is found on these measurements.
  • Polarization measurements of stars in the region of the nearby molecular cloud MBM 12 
    Bhatt, H. C; Jain, S. K (Blackwell Publishing, 1992-07)
    Linear polarization measurements of stars in the region of the nearby high-latitude molecular cloud MBM 12 are presented. Stars behind the cloud show a polarization of about 2-3 percent, while stars that are in front of ...
  • Polarization measurements of the luminous blue variable HR Carinae 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (European Southern Observatory, 2000-03)
    We have made BVRI polarization measurements of HR Car on ten occasions during the period JD 2447919 to JD 2449014. All our observations are on the rising part of the light curve. We find the presence of intrinsic variable ...
  • Polarization measurements of Vega-like stars 
    Bhatt, H. C; Manoj, P (European Southern Observatory, 2000-10)
    Optical linear polarization measurements are presented for about 30 Vega-like stars. These are then compared with the polarization observed for normal field stars. A significant fraction of the Vega-like stars are found ...
  • A possible scenario for the formation of the composite Large Magellanic Cloud star cluster NGC 2214 
    Bhatt, H. C; Sagar, R (Astronomical Society of India, 1992)
    The total masses and relaxation times for the two stellar populations (old and young) in the star cluster NGC 2214 are estimated. The total masses are found to be comparable. While the older population may be dynamically ...
  • Possible young stellar objects in the region of the Cygnus OB2 (VI Cygni) association from IRAS observations 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (EDP Sciences, 1992-12)
    Several massive young stellar objects are found from an analysis of the 12- to 100-micron flux data of IRAS sources in the region of the Cyg OB2 association. Sixty-four sources with positive spectral indices and steeply ...

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