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Browsing by Author "Ojha, D. K"

Browsing by Author "Ojha, D. K"

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  • Reappearance of McNeil’s Nebula (V1647 Orionis) and its Outburst Environment 
    Ninan, J. P; Ojha, D. K; Bhatt, B. C; Ghosh, S. K; Mohan, V; Mallick, K. K; Tamura, M; Henning, T (IOP Publishing, 2013-12-01)
    We present a detailed study of McNeil's nebula (V1647 Ori) in its ongoing outburst phase starting from 2008 September to 2013 March. Our 124 nights of photometric observations were carried out in optical V, R, I, and ...
  • Second outburst phase of McNeil's nebula (V1647 Orionis) 
    Kaurav, S. S; Ojha, D. K; Ninan, J. P; Bhatt, B. C; Sahu, D. K; Ghosh, S. K; Tej, A (Astronomical Society of India, 2010)
    The FU Ori/EX Od phenomenon represents a rare and not yet fully understood phase of the early evolution of low mass stars. Therefore, the photometric and spectroscopic monitoring of the post-outburst phase of these ...
  • Sh2-138: physical environment around a small cluster of massive stars 
    Baug, T; Ojha, D. K; Dewangan, L. K; Ninan, J. P; Bhatt, B. C; Ghosh, S. K; Mallick, K. K (Oxford University Press on behalf of the Royal Astronomical Society, 2015-12-21)
    We present a multiwavelength study of the Sh2-138, a Galactic compact H II region. The data comprise of optical and near-infrared (NIR) photometric and spectroscopic observations from the 2-m Himalayan Chandra Telescope, ...
  • Spatial distribution of Unidentified Infrared emission Bands in star forming regions 
    Ghosh, S. K; Ojha, D. K (Astronomical Society of India, 2002-09)
    Midcourse Space Experiment (MSX) has surveyed the Galactic plane in four infrared bands between 6 and 25 /Lm, two of which cover several Unidentified Infrared emission Bands (UIBs). A scheme has been developed to extract ...
  • Spectrophotometric observations of B type stars HR 1207 and HR 1770 
    Joshi, S. C; Ojha, D. K (Astronomical Society of India, 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 ...
  • Spectroscopic observations of first ISOGAL sources 
    Ojha, D. K; Sivarani, T; Parthasarathy, M; Omont, A; Ganesh, S; Simon, G (Astronomical Society of India, 2000)
    Infrared Space Observatory Galactic (ISOGAL) survey at 7 and 15 μm of ~ 22 deg2 of the inner galactic disk and bulge, has detected several hundred thousand sources. Combining ISOGAL survey with I, J, H, Ks data of DENIS ...
  • Star Formation Activity in the Galactic H II Complex S255-S257 
    Ojha, D. K; Samal, M. R; Pandey, A. K; Bhatt, B. C; Ghosh, S. K; Sharma, S; Tamura, M; Mohan, V; Zinchenko, I (IOP Publishing, 2011-09-10)
    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 H II 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 (IOP Publishing, 2012-11-01)
    We present a multiwavelength study of the Galactic H II 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. ...
  • Star Formation and Evolution of Blister-type H II Region Sh2-112 
    Panwar, N; Sharma, S; Ojha, D. K; Baug, T; Dewangan, L. K; Bhatt, B. C; Pandey, R (IOP Publishing, 2020-12-10)
    We report the observational findings of the Sh2-112 H ii region by using the multiwavelength data analysis ranging from optical to radio wavelengths. This region is powered by the massive O8V-type star BD +45 3216. The ...
  • Star formation in young cluster NGC 1893 
    Sharma, S; Pandey, A. K; Ojha, D. K; Chen, W. P; Ghosh, S. K; Bhatt, B. C; Maheswar, G; Sagar, R (International Astronomical Union, 2008-05)
    We have carried out a multi-wavelength study of the star forming region NGC 1893 to make a comprehensive exploration of the effects of massive stars on low mass star formation. Using deep optical U BV RI broad band, Hα ...
  • Star formation in young star cluster NGC1893 
    Sharma, S; Pandey, A. K; Ojha, D. K; Chen, W. P; Ghosh, S. K; Bhatt, B. C; Maheswar, G; Sagar, R (Blackwell Publishing, 2007-09)
    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; Mito, H; Maheswar, G; Sharma, S (Blackwell Publishing, 2008-03)
    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 (IMF). ...
  • Stellar contents and star formation in the young star cluster Be 59 
    Pandey, A. K; Sharma, S; Ogura, K; Ojha, D. K; Chen, W. P; Bhatt, B. C; Ghosh, S. K (Blackwell Publishing, 2008-01)
    We present UBV Ic CCD photometry of the young open cluster Be 59 with the aim to study the star formation scenario in the cluster. The radial extent of the cluster is found to be ~10 arcmin (2.9 pc). The interstellar ...
  • A Study of the Galactic Star Forming Region IRAS 02593+6016 / S 201 in Infrared and Radio Wavelengths 
    Ojha, D. K; Ghosh, S. K; Kulkarni, V. K; Testi, L; Verma, R. P; Vig, S (Astronomical Society of India, 2003)
    We present infrared and radio observations of IRAS 02593+6016 / S 201 star forming region. A young star cluster is observed in this region, which contains different classes of young stellar objects. The near-infrared (NIR) ...
  • TIRSPEC: TIFR Near Infrared Spectrometer and Imager 
    Ninan, J. P; Ojha, D. K; Ghosh, S. K; D'Costa, S. L. A; Naik, M. B; Poojary, S. S; Sandimani, P. R; Meshram, G. S; Jadhav, R. B; Bhagat, S. B; Gharat, S. M; Bakalkar, C. B; Prabhu, T. P; Anupama, G. C; Toomey, D. W (World Scientific Publishing Co., 2014-12)
    We describe the TIFR Near Infrared Spectrometer and Imager (TIRSPEC) designed and built in collaboration with M/s. Mauna Kea Infrared LLC, Hawaii, USA, now in operation on the side port of the 2-m Himalayan Chandra Telescope ...
  • Triggered star formation and evolution of T-Tauri stars in and around bright-rimmed clouds 
    Chauhan, N; Pandey, A. K; Ogura, K; Ojha, D. K; Bhatt, B. C; Ghosh, S. K; Rawat, P. S (Blackwell Publishing, 2009-06)
    The aim of this paper is to quantitatively testify the `small-scale sequential star formation' hypothesis in and around bright-rimmed clouds (BRCs). As a continuation of the recent attempt by Ogura et al., we have carried ...
  • UBV CCD standards near 5C1 radio sources at intermediate galactic latitude I 
    Mohan, V; Ojha, D. K; Bienayme, O; Paliwal, D. C; Pandey, A. K; Robin, A. L; Bhatt, B. C (Astronomical Society of India, 1994)
    We have been doing a photometric and astrometric sample survey programme on Schmidt plates in a few selected directions in the Galaxy with an aim to study galactic stellar populations. In order to calibrate Schmidt plates ...
  • Ultraviolet Imaging Telescope (UVIT) observation of the Galactic globular cluster NGC 7492 
    Kumar, R; Pradhan, A. C; Mohapatra, Abhisek; Moharana, Ayush; Ojha, D. K; Parthasarathy, M; Murthy, J (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    We present detailed photometric observations of the Galactic globular cluster NGC 7492 using the data obtained with two far-ultraviolet (FUV; 1300–1800 Å) and three near-ultraviolet (NUV; 2000–3000 Å) filters of Ultraviolet ...
  • UVIT observations of UV-Bright stars in four Galactic Globular Clusters 
    Kumar, R; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, A; Murthy, J (Cambridge University Press, 2019-05)
    We have performed photometric analysis of four Galactic globular clusters (GGCs): NGC 4147, NGC 4590, NGC 5053 and NGC 7492 using far-UV and near-UV filters of the Ultraviolet Imaging Telescope (UVIT) on-board AstroSat. ...
  • UVIT study of UV bright stars in the globular cluster NGC 4147 
    Ranjan Kumar; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, Abhisek; Murthy, J; Cassisi, Santi (Indian Academy of Sciences, 2021-10)
    We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF2 (F154W), sapphire (F169M), and silica (F172M) of Ultra-Violet Imaging Telescope (UVIT) on-board the AstroSat satellite. ...

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