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Browsing Aryabhatta Research Institute of Observational Sciences by Title

Browsing Aryabhatta Research Institute of Observational Sciences by Title

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  • A spectroscopic study of the hybrid pulsator γ Pegasi 
    Pandey, C. P.; Morel, T.; Briquet, M.; Jaykumar, K.; Bisht, S.; Sanwal, B. B. (2011)
    The recent detection of both pressure and high-order gravity modes in the classical B-type pulsator γ Pegasi offers promising prospects for probing its internal structure through seismic studies. To aid further modelling ...
  • Spectroscopic survey of ASAS eclipsing variables: search for chromospherically active eclipsing binary stars – I 
    Parihar, P.; Messina, S.; Bama, P.; Medhi, B. J.; Muneer, S.; Velu, C.; Ahmad, A. (2009)
    We have started a spectroscopic survey to identify new chromospherically active components and low-mass pre-main sequence (PMS) stars in recently discovered All Sky Automated Survey (ASAS) eclipsing binaries. In this paper, ...
  • Spectroscopy of nine eruptive young variables using TANSPEC 
    Ghosh, Arpan; Shrama, Saurabh, et.al; Verma, Aayushi (Journal Astrophysical Astronomy, 2023-06)
    In recent times, 3.6m Devasthal Optical Telescope (DOT) has been installed with an optical to near infra-red spectrograph, TANSPEC, which provides spectral coverage from 0.55 to 2.5 microns. Using TANSPEC, we have obtained ...
  • The spectrum of periodic comet Encke 
    Goraya, P. S.; Sanwal, B. B.; Rautela, B. S. (1986)
    Periodic comet Encke (P/Encke) was observed spectrophotometrically during its apparition in 1984 march, before perihelion. We observed emission features due to CN and C₂ molecules, but sodium emission was absent from the ...
  • SS 433: Results of a recent multiwavelength campaign 
    Chakrabarti, S. K.; Anandarao, B. G.; Pal, S.; Mondal, S.; Nandi, A.; Bhattacharyya, A.; Mandal, S.; Sagar, R.; Pandey, J. C.; Pati, A.; Saha, K. (2005)
    We conducted a multiwavelength campaign in 2002 September–October, to observe SS 433. We used the Giant Meter Radio Telescope for radio observations, the Physical Research Laboratory Infrared Telescope at Mt Abu for infrared ...
  • ST Persei: a possible multi-body system 
    Srivastava, R. K. (1988)
    Detailed period study of the eclipsing binary ST Per is presented. A new period (P=2.ͩ 648339) is given. Period changes in different portions of the O-C diagram with a new period have been estimated. The total changes in ...
  • 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 efficiency in clouds of various masses 
    Pandey, A. K.; Paliwal, D. C.; Mahra, H. S. (1990)
    The present study is aimed at finding out the effect of variation of the initial mass function (IMF) on star - formation efficiency (SFE) in clouds of various masses. Using the model of Elmegreen and Clemans, it is found ...
  • 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 small clusters associated with bright-rimmed cloud and H II regions 
    Neelam (ARIES, Nainital, 2011-03)
  • 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 ...
  • Star-forming site RAFGL 5085: Is a perfect candidate of hub-filament system? 
    Dewangan, L. K.,et.al; Shrama, Saurabh (Journal Astrophysical Astronomy, 2023-06)
    To investigate the star-formation process, we present a multi-wavelength study of a massive star forming site RAFGL 5085, which has been associated with the molecular outflow, Hii region and near-infrared cluster. The ...
  • 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 ...
  • Statistical analysis of dynamical evolution of open clusters 
    MAURYA, JAYANAND; JOSHI, Y. C.; SAMAL, MANASH RANJAN; RAWAT, VINEET; GOUR, ANUBHA SINGH (Journal Astrophysical Astronomy, 2023-07)
    We present the dynamical evolution of 10 open clusters, which were part of our previous studies. These clusters include both young and intermediate-age open clusters with ages ranging from 25 ± 19 Myr to 1.78 ± 0.20 Gyr. ...
  • A statistical analysis of the detection limits of fast photometry 
    Mary, D. L. (2006)
    This work investigates the statistical limits for the detection of stellar variability using ground based fast photometry. We show that when sky transparency variations are very low or have been efficiently removed from ...
  • The stellar content of the young open cluster Trumpler 37 
    Errmann, R., et al.; Pandey, A. K. (Wiley Online, 2013-08)
    With an apparent cluster diameter of 1.5◦ and an age of ∼ 4 Myr, Trumpler 37 is an ideal target for photometric monitoring of young stars as well as for the search of planetary transits, eclipsing binaries and other sources ...
  • Stellar contents and star formation in the young cluster stock 18 
    Bhatt, H.; Sagar, R.; Pandey, J. (Elsevier, 2012)
    We have carried out deep (V ~21 mag) UBVRI photometric study of the star cluster Stock 18. These along with archival Infrared data have been used to derive the basic cluster parameters and also to study the star formation ...
  • 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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