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Browsing by Author "Ogura, K."

Browsing by Author "Ogura, K."

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  • Age sequence in small clusters associated with bright-rimmed clouds 
    Ogura, K.; Chauhan, N.; Pandey, A. K.; Bhatt, B. C.; Ojha, D.; Itoh, Y. (2007-02-25)
    Bright-rimmed clouds (BRCs) found in H II regions are probable sites of triggered star formation due to compression by ionization/shock fronts, and it is hypothesized that star formation proceeds from the exciting star(s) ...
  • Interstellar extinction in the open clusters towards galactic longitude around 130◦ 
    Pandey, A. K.; Upadhyay, K.; Nakada, Y.; Ogura, K. (2003)
    In this paper we present a detailed study of the intra-cluster reddening material in the young open clusters located around l ∼ 130◦ using colour-excess diagrams and two-colour diagrams. The study supports the universality ...
  • Mass functions and photometric binaries in nins open clusters 
    Sharma, S.; Pandey, A. K.; Ogura, K.; Aoki, T.; Pandey, K.; Sandhu, T. S.; Sagar, R. (2008-05)
    Using homogeneous CCD photometric data from the 105 cm Kiso Schmidt telescope covering a 50' × 50' field, we study the mass functions (MFs) of nine open clusters. The ages and Galactocentric distances of the target ...
  • 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 ...
  • 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 = ...
  • NGC 7654: An interesting cluster to study star formation history 
    Pandey, A. K.; Nilakshi; Ogura, K.; Sagar, R.; Tarusawa, K. (2001)
    CCD UBVIc photometry in a wide field around the open cluster NGC 7654 has been carried out for ∼17 860 stars, down to V ∼ 20. The reddening across the cluster region is found to be variable with E(B −V )min = 0.46 to E(B ...
  • The population in the background of open clusters: tracer of the Norma-Cygnus arm 
    Pandey, A. K.; Sharma, S.; Ogura, K. (2006)
    We present colour–magnitude diagrams of open clusters, located in the range 112˚< l< 252˚ , manifesting stellar populations in the background of clusters. Some of the populations are found to be located beyond the ...
  • 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 ...
  • Stars at the tip of peculiar elephant trunk-like clouds in IC 1848E: a possible third mechanism of triggered star formation 
    Chauhan, N.; Ogura, K.; Pandey, A. K.; Samal, M. R.; Bhatt, B. C. (Astronomical Society of Japan, 2011-08-25)
    The HII region IC 1848 harbors a lot of intricate elephant trunk-like structures that look morphologically different from usual bright-rimmed clouds (BRCs). Of particular interest is a concentration of thin and long elephant ...
  • 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 ...
  • 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. (2008)
    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 ...
  • Stellar contents of the galactic giant HII region NGC 3603 
    Pandey, A. K.; Ogura, K.; Sekiguchi, K. (2000)
    We present CCD UBVRI and Hа photometry for the starburst cluster associated with the galactic giant HII region NGC 3603. The mean reddening of the cluster members comes out to be (E(B-V)) = 1.48±0.21 (s.d.). The surface ...
  • Stellar contents of two intermediate age clusters: NGC 1912 and NGC 1907 
    Pandey, A. K.; Sharma, S.; Upadhyay, K.; Ogura, K.; Sandhu, T. S.; Mito, H.; Sagar, R. (2007-06-25)
    We present CCD photometry in a wide field around two open clusters, NGC 1912 and NGC 1907. The stellar surface density profiles indicate that the radii of the clusters NGC 1912 and NGC 1907 are ~14́ and ~6́respectively. ...
  • Stellar contents of two young open clusters: NGC 663 and 654 
    Pandey, A. K.; Upadhyay, K.; Ogura, K.; Sagar, R.; Mohan, V.; Mito, H.; Bhatt, H. C.; Bhatt, B. C. (2005)
    UBVRI CCD photometry in a wide field around two young open clusters, NGC 663 and 654, has been carried out. Hα and polarimetric observations for the cluster NGC 654 have also been obtained. We use the photometric data ...
  • 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. (2009)
    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 ...
  • Wide field CCD photometry of the young open cluster NGC 663 
    Pandey, A. K.; Upadhyay, K.; Ogura, K.; Sagar, R. (2003)
    A deep and wide field CCD photometry of the young open cluster NGC 663 has been carried out. We report preliminary results of our investigations, specifically the determination of the cluster mass function which is found ...
  • Wide-field CCD photometry around nine open clusters 
    Sharma, S.; Pandey, A. K.; Ogura, K.; Mito, H.; Tarusawa, K.; Sagar, R. (2006-10)
    In this paper we study the evolution of the core and corona of nine open clusters using the projected radial density profiles derived from homogeneous CCD photometric data obtained with the 105 cm Kiso Schmidt telescope. ...
  • Young stellar population and ongoing star formation in the H II complex Sh2-252 
    Jose, J.; Pandey, A. K.; Samal, M. R.; Ojha, D. K.; Ogura, K.; Kim, J. S.; Kobayashi, N.; Goyal, A.; Chauhan, N.; Easwaraia, C. (Wiley Online, 2013-07-11)
    In this paper, an extensive survey of the star-forming complex Sh2-252 has been undertaken with an aim to explore its hidden young stellar population as well as to understand the structure and star formation history for ...

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