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Browsing Aryabhatta Research Institute of Observational Sciences by Author "Ojha, D. K."

Browsing Aryabhatta Research Institute of Observational Sciences by Author "Ojha, D. K."

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  • Broad-band optical polarimetric studies towards the Galactic young star cluster Berkeley 59 
    Eswaraiah, C.; Pandey, A. K.; Maheswar, G.; Chen, W. P.; Ojha, D. K.; Chandola, H. C. (2012)
    We present multiwavelength optical linear polarimetric observations of 69 stars towards the young open cluster Berkeley 59. The observations reveal the presence of three dust layers located at distances of ∼300, ∼500 and ...
  • Colour indices of the Markarian galaxies 
    Ojha, D. K.; Joshi, S. C. (1991)
    By use of the ANS ultraviolet fluxes, optical (UBV) and IRAS infrared fluxes, several colour indices for a few Markarian galaxies have been investigated. A comparison of these indices with those for normal NGC galaxies has ...
  • The IMF of stellar clusters: effects of accretion and feedback 
    Dib, S.; Shadmehri, M.; Padoan, P.; Maheswar, G.; Ojha, D. K.; Khajenabi, F. (2010)
    We have developed a model which describes the co-evolution of the mass function of dense gravitationally bound cores and of the stellar mass function in a protocluster clump. In the model, dense cores are injected, at a ...
  • A multiwavelength census of stellar contents in the young cluster NGC 1624 
    Jose, J.; Pandey, A. K.; Ogura, K.; Ojha, D. K.; Bhatt, B. C.; Samal, M. R.; Chauhan, N.; Sahu, D. K.; Rawat, P. S. (2011)
    We present a comprehensive multiwavelength analysis of the young cluster NGC 1624 associated with the HII region Sh2-212 using optical UBVRI photometry, optical spectroscopy and GMRT radio continuum mapping along with ...
  • A multiwavelength study of galactic H II region Sh 2-294 
    Samal, M. R.; Pandey, A. K.; Ojha, D. K.; Ghosh, S. K.; Kulkarni, V. K.; Bhatt, B. C. (2007-12-10)
    We present the observational results of Galactic H II region Sh 2-294, using optical photometry, narrowband imaging, and radio continuum mapping at 1280 MHz, together with archival data from the 2MASS, MSX, and IRAS surveys. ...
  • A multiwavelength study of star formation in the vicinity of galactic H II region Sh2-100 
    Samal, M. R.; Pandey, A. K.; Ojha, D. K.; Ghosh, S. K.; Kulkarni, V. K.; Kusakabe, N.; Tamura, M.; Bhatt, B. C.; Thompson, M. A.; Sagar, R. (2010)
    We present multiwavelength investigation ofmorphology, physical-environment, stellar contents, and star formation activity in the vicinity of star-forming region Sh 2-100. It is found that the Sh 2-100 region contains ...
  • Near-infrared JH photometry of young open cluster Be 59 
    Sharam, S.; Ogura, K.; Pandey, A. K.; Ojha, D. K.; Bhatt, B. C. (2007)
    We present near-infrared JH photometry and optical slitless spectroscopy of stars in the field of the young cluster Be 59. The J/(J − H) colour-magnitude diagram of the cluster yields a distance modulus of (m − M )0 = ...
  • New survey of UBV photometry and absolute paper motions at internediate latitude 
    Ojha, D. K.; Bienayme, O.; Mohan, V.; Robin, A. C. (1999)
    A photometric and proper motion survey has been obtained in 2 directions at intermediate latitude: (l = 167.5° , b = 47.4° ; α₂ₒₒₒ= 9ʰ 41ᵐ 26ᶳ ,δ₂ₒₒₒ = +49° 53' 27” ) and (l = 278° , b = 47° ; α₂ₒₒₒ = 11ʰ 42ᵐ 56ᶳ , δ₂ₒₒₒ ...
  • On the shell star pleione (BU Tauri) 
    Ojha, D. K.; Joshi, S. C. (1991)
    BU Tauri (Pleione) an interesting star in the Pleiades cluster, has been observed spectrophotometrically. The energy distribution curves of the star have been discussed vis a vis model atmospheres for normal stars in the ...
  • Pre-main-sequence population in NGC 1893 region 
    Pandey, A. K.; Samal, M. R.; Chauhan, N.; Eswariah, C.; Pandey, J. C.; Chen, W. P.; Ojha, D. K. (2013)
    In this paper we continued our efforts to understand the star formation scenario in and around the young cluster NGC 1893. We used a sample of the young stellar sources (YSOs) identified on the basis of multiwavelength data ...
  • Pre-main-sequence population in NGC 1893 region: X-ray properties 
    Pandey, A. K.; Samal, M. R.; Yadav, Ramkesh; Richichi, Andrea; Lata, Sneh; Pandey, J. C.; Ojha, D. K.; Chen, W. P. (Elsevier, 2013-11-08)
    Continuing the attempt to understand the properties of the stellar content in the young cluster NGC 1893 we have carried out a comprehensive multi-wavelength study of the region. The present study focuses on the X-ray ...
  • Spectrophotometric observations of B type stars HR 1207 and HR 1770 
    Joshi, S. C.; Ojha, D. K. (1991)
    Two high rotational velocity B type stars HR 1207 and HR 1770 have been observed spectrophotometrically. The energy distribution curves of the stars have been compared with model atmospheres in the ultraviolet and visible ...
  • Spectrophotometric observations of HR 8107 
    Joshi, S. C.; Ojha, D. K.; Srivastava, J. B. (1989)
    HR 8107, a reported new Be star, has been observed spectrophotometrically. The energy distribution curve of the star has been compared with those of other stars of similar spectral and luminosity types and model atmospheres. ...
  • Spectrophotometry of Comet Bradfield (1987s) 
    Ojha, D. K.; Joshi, S. C. (1989)
    Special scans of COmet Bradfield (1987s) at heliocentric distance of 1.539 AU have been observed spectrophotometrically. The column densities and production rates of C₂and CN have been derived.
  • Star formation activity in the galactic H II complex S255-S257 
    Ojha, D. K. (IOP, 2011)
    We present results on the star formation activity of an optically obscured region containing an embedded cluster (S255-IR) and molecular gas between two evolved H II regions, S255 and S257. We have studied the complex using ...
  • Star formation activity in the galactic hii region Sh2-297 
    Mallick, K. K.; Ojha, D. K.; Samal, M. R.; Pandey, A. K.; Bhatt, B. C.; Ghosh, S. K.; Dewangan, L. K.; Tamura, M. (2012)
    We present a multiwavelength study of the Galactic Hii region Sh2-297, located in the Canis Major OB1 complex. Optical spectroscopic observations are used to constrain the spectral type of ionizing star HD 53623 as B0V. The ...
  • Star formation and young population of the HII complex Sh2-294 
    Samal, M. R.; Pandey, A. K.; Ojha, D. K.; Chauhan, N.; Jose, J.; Pandey, B. (2012)
    The Sh2-294 Hii region ionized by a single B0V star features several infrared excess sources, a photodissociation region, and also a group of reddened stars at its border. The star formation scenario in this region seems ...
  • Star formation in bright-rimmed clouds and clusters associated with the W5 E H II region 
    Chauhan, N.; Pandey, A. K.; Ogura, K.; Jose, J.; Ojha, D. K.; Samal, M. R.; Mito, H. (2011)
    The aim of this paper is to present the results of photometric investigations of the central cluster of the W5 E HII region as well as a follow-up study of the triggered star formation in and around bright-rimmed clouds ...
  • Star formation in young star cluster NGC 1893 
    Sharma, S.; Pandey, A. K.; Ojha, D. K.; Chen, W. P.; Ghosh, S. K.; Bhatt, B. C.; Maheswar, G.; Sagar, R. (2007)
    We present a comprehensive multiwavelength study of the star-forming region NGC 1893 to explore the effects of massive stars on low-mass star formation. Using near-infrared colours, slitless spectroscopy and narrow-band ...
  • Stellar contents and star formation in the young open cluster Stock 8 
    Jose, J.; Pandey, A. K.; Ojha, D. K.; Ogura, K.; Chen, W. P.; Bhatt, B. C.; Ghosh, S. K.; Minto, H.; Maheswar, G.; Sharma, S. (2008)
    We present UBVIc CCD photometry of the young open cluster Stock 8 with the aim of studying its basic properties such as the amount of interstellar extinction, distance, age, stellar contents and initial mass function ...

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