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  • X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat 
    Kuznetsov, A. A.; Karakotov, R. R.; Chandrashekhar, K.; Banerjee, D. (Research in Astronomy and Astrophysics, 2023-01)
    We present observations of the active M-dwarf binary AT Mic (dM4.5e+dM4.5e) obtained with the orbital observatory AstroSat. During 20 ks of observations, in the far-ultraviolet (130–180 nm) and soft X-ray (0.3–7 keV) spectral ...
  • X-ray confirmation of the intermediate polar IGR J16547-1916 
    Joshi, A.,et.al.; Pandey, J. C.; Rawat, N. (Astronomy & Astrophysics, 2022-01)
    Using X-ray observations from the NuSTAR and Swift satellites, we present temporal and spectral properties of an intermediate polar (IP) IGR J16547-1916. A persistent X-ray period at ∼546 s confirming the optical spin ...
  • X-ray emission characteristics of two Wolf–Rayet binaries: V444 Cyg and CD Cru 
    Bhatt, H.; Pandey, J. C.; Kumar, B.; Singh, K. P.; Sagar, R. (2010)
    Using data from observations made with XMM–Newton, we present an X-ray analysis of two Wolf–Rayet (WR) binaries: V444 Cyg and CD Cru. The X-ray light curves show the phase-locked variability in both binaries, where the ...
  • X-ray emission from O-type stars: DH Cep and HD 97434 
    Bhatt, H.; Pandey, J. C.; Kumar, B.; Sagar, R.; Singh, K. P. (2010)
    We present X-ray emission characteristics of the massive O-type stars DH Cep and HD 97434 using archival XMM-Newton observations. There is no convincing evidence for short-term variability in the X-ray intensity during ...
  • An X-ray flare from 47 cas 
    Pandey, J. C.; Karmakar, Subhajeet (The American Astronomical Society, 2015-01-08)
    Using XMM-Newton observations, we investigate properties of a flare from the very active but poorly known stellar system 47 Cas. The luminosity at the peak of the flare is found to be 3.54 × 10 ³⁰ erg s⁻¹, which is ∼2 times ...
  • X-ray Flares Observed from Six Young Stars Located in the Region of Star Clusters NGC 869 and IC 2602 
    Bhatt, H.; Pandey, J. C.; Singh, K. P.; Sagar, R.; Kumar, B. (Indian Academy of Sciences, 2014-12-27)
    We present, for the first time, an analysis of seven intense X-ray flares observed from six stars (LAV 796, LAV 1174, SHM2002 3734, 2MASS 02191082+5707324, V553 Car, V557 Car). These stars are located in the region of ...
  • X-ray intraday variability and power spectral density profiles of the blazar 3C 273 with XMM–Newton during 2000–2021 
    Gowtami, G. S. Pavana,et.al.; Gaur, Haritma; Gupta, Alok C. (Monthly Notices of the Royal Astronomical Society, 2022-04)
    We present X-ray intraday variability and power spectral density (PSD) analyses of the longest 23 pointed XMM–Newton observations of the blazar 3C 273 that were taken during 2000–2021. These good time intervals contain ...
  • X-Ray Intraday Variability of the TeV Blazar Markarian 421 with XMM-Newton 
    Noel, A Priyana, et.al.; Gaur, Haritma; Gupta, Alok C.; Dhiman, Vinit (The Astrophysical Journal Supplement Series, 2022-09)
    Highly variable Markarian 421 is a bright high–synchrotron energy peaked blazar showing a wide featureless nonthermal spectrum, making it a good candidate for our study of intraday flux and spectral variations over time. We ...
  • X-ray intraday variability of the TeV blazar Mrk 421 with Chandra. 
    Aggrawal, Vishi et al.; Pandey, Ashwani; Gupta, Alok C. (Monthly notices of the Royal Astronomical society, 2018-11)
    We present an extensive study of 72 archival Chandra light curves of the high-frequencypeaked type blazar Mrk 421, the first strong extragalactic object to be detected at TeV energies. Between 2000 and 2015, Mrk 421 often ...
  • X-ray Observations of Eight Young Open Star Clusters: I. Membership and X-ray Luminosity 
    Bhatt, Himali; Pandey, J. C.; Singh, K. P.; Sagar, R.; Kumar, Brijesh (2013)
    We present a detailed investigation of X-ray source contents of eight young open clusters with ages between 4 to 46Myr using archival X-ray data from XMM-NEWTON. The probable cluster memberships of the X-ray sources have ...
  • An X-Ray Study of Coronally Connected Active Eclipsing Binaries 
    Singh, Gurpreet; Pandey, J. C. (The Astrophysical Journal, 2022-07)
    We present a detailed X-ray analysis and imaging of stellar coronae of five coronally connected eclipsing binaries, namely, 44 Boo, DV Psc, ER Vul, XY UMa, and TX Cnc. Both components of these binaries are found to ...
  • X6.9-class flare-induced vertical kink oscillations in a large-scale plasma curtain as observed by the solar dynamics observatory/atmospheric imaging assembly 
    Srivastava, A. K. (The American Astronomical Society, 2013)
    We present rare observational evidence of vertical kink oscillations in a laminar and diffused large-scale plasma curtain as observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. The ...
  • Yake effects in various telescope mirrors 
    Gupta, K. G. (1989)
    The yake effects in the 56 cm and the 38 cm pyrex mirrors of the Uttar Pradesh State Observatory is described. Similarly effects elsewhere are also discussed.
  • Year-long variability of the fossil fuel and wood burning black carbon components at a rural site in southern Delhi outskirts 
    Dumka, U. C. et al.; Kumar, S. (Atmospheric research, Elsevier, 2019-02)
    This study examines year-long (April 2015 – March 2016) measurements of black carbon (BC) concentrations acquired with a 7-wavelength Aethalometer (ΑΕ-42) at Panchgaon, in the southern Delhi outskirts. We assess the ...
  • Yet Another Odd Radio Circle? 
    Omar, Amitesh (Research Notes of the AAS, 2022-05)
    The Odd Radio Circles are newly identified diffuse radio sources at ∼1 GHz frequency, with edge-brightened nearly circular morphology, which is remarkably similar to supernova remnants although a physical association with ...
  • Young brown dwarfs in the core of the W3 main star-forming region 
    Ojha, D. K.; Tamura, M.; Nakajim, Y.; Saito, H.; Pandey, A. K.; Ghosh, S. K.; Aoki, K. (2009-03-01)
    We present the results of deep and high-resolution (FWHM ∼ 0. 35) JHK near-infrared (NIR) observations with the Subaru telescope, to search for very low mass young stellar objects in the W3 Main star-forming region. The ...
  • The young open star clusters: stability and structure 
    Pandey, A. K.; Mahra, H. S.; Sagar, R. (1990)
    It is found that the differential extinction ∆E(B - V) in open clusters, which may be due to the presence of gas and dust, decreases systematically with the age of the cluster. Consequently we can infer that the average ...
  • 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 ...
  • Young stellar population of bright-rimmed clouds BRC 5, BRC 7 and BRC 39 
    Panwar, Neelam, et al.; Pandey, A. K. (Wiley Online, 2014-09-11)
    Bright-rimmed clouds (BRCs), illuminated and shaped by nearby OB stars, are potential sites of recent/ongoing star formation. Here we present an optical and infrared photometric study of three BRCs: BRC 5, BRC 7 and BRC ...
  • पुस्तक - मेरी योजना (केंद्र सरकार), प्रथम संस्करण 
    कार्यक्रम क्रियान्वयन विभाग, उत्तराखण्ड शासन (कार्यक्रम क्रियान्वयन विभाग, उत्तराखण्ड शासन, 2024-11)
    इस पुस्तक को प्रकाशित करने का मुख्य उ‌द्देश्य, उत्तराखण्ड/देश की जनता को भारत सरकार के मुख्यतः उत्तराखण्ड राज्य में स्थापित/कार्यरत विभागों, संस्थाओं, आयोगों, संगठनों, मंत्रालयों द्वारा किये जा रहे कार्यों एवं उनके द्वारा ...

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