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  • FG Sagittae and s-Process Nucleosynthesis 
    Ramadurai, S (Astronomical Society of India, 1974-03)
  • FG Sagittae: A Newborn R Coronae Borealis Star? 
    Gonzalez, G; Lambert, D. L; Wallerstein, G; Kameswara Rao, N; Smith, V. V; McCarthy, J. K (The American Astronomical Society, 1998-01)
    We have monitored FG Sge's spectroscopic changes since the time just prior to its dramatic fading in 1992 August. The most significant qualitative changes in the spectrum include large variations in the strength of the C2 ...
  • Fiber-fed echelle spectrometer of the 2.34 meter Vainu Bappu Telescope 
    Kameswara Rao, N; Sriram, S; Gabriel, F; Prasad, B. R; Samson, J. P. A; Jayakumar, K; Srinivasan, R; Mahesh, P. K; Giridhar, S (Anita Publications, 2004-12)
    The optical design and performance of high resolution fiber-fed echelle spectrometer for the 2.34 meter Vainu Bappu Telescope (VBT) is described. An optical fiber of core 100 J-Lm and length 45 meter is used to link the ...
  • Fibre spectroscopy and BV CCD photometry of the southern open cluster NGC 3114 
    Sagar, R; Sharples, Ray M (European Southern Observatory, 1991-04)
    New spectroscopic and photometric observations are presented for a sample of faint stars which extends the color-magnitude diagram of the open cluster NGC 3114 down to V = 16 mag. The distance to the cluster is estimated ...
  • Field blue straggler stars: discovery of white dwarf companions to blue metal-poor stars using UVIT/AstroSat 
    Panthi, Anju; Subramaniam, A; Vaidya, Kaushar; Jadhav, Vikrant V; Sharmila Rani; Sivarani, T; Pandey, Sindhu (Oxford University Press on behalf of Royal Astronomical Society, 2023-10)
    Blue metal-poor (BMP) stars are the main-sequence stars that appear bluer and more luminous than normal turn-off stars of metal-poor globular clusters. They are believed to be either field blue straggler stars (FBSS) formed ...
  • Field star contamination in open star cluster NGC 2301 
    Mohan, V; Sagar, R (Astronomical Society of Indian, 1988-12)
    Photographic photometry of about 900 stars down to V = 17 mag has been carried out in the region of the open cluster NGC 2301. The cluster region seems to be severely contaminated by field stars. Statistical criteria yield ...
  • Field Strength Measurements A-3 Method (Oblique Incidence) at Ahmedabad during Total Solar Eclipse October 1995 
    Lele, P. D; Jani, K. G; Patel, A. P (Indian Institute of Astrophysics, Bangalore, 1997)
    A RACAL-17L communication receiver is used to record signal strength at Ahmedabad on 11.8 MHz transmitted from Colombo. In the initial stages of the eclipse and again towards the ending phase the signal strength showed ...
  • Fifteen Hypervelocity Stars Whose Gaia G Magnitudes are Less Than 16.0 and Radial Velocities Less Than-600 km per second 
    Parthasarathy, M (American Astronomical Society, 2023-12)
    From Gaia DR3 data using a simple search criteria fifteen hypervelocity stars (HVS) are detected. These stars have radial velocities less than -600 km s-1, Gaia G magnitudes less than 16.0 and Renormalized Unit Weight Error ...
  • Fifteenth General Assembly of the I. A. U. 
    Bhattacharyya, J. C (Astronomical Society of India, 1973-09)
  • Fifth force as a manifestation of torsion 
    de Sabbata, V; Sivaram, C (Plenum Publishing Corporation, 1990-01)
    A deviation from the Newtonian inverse square law can arise from torsion coupling.
  • Fifth Seminar on General Relativity and Gravitation 
    Narlikar, J. V (Astronomical Society of India, 1975-03)
  • Filament activity in a quiet region flare 
    Sundararaman, K; Gupta, S. S; Selvendran, R (Indian Academy of Sciences, 1993-03)
    We have taken the case of a circular H-alpha filament observed on May 9, 1979 erupting into a double-ribbon flare associated with a nonspot region. The plage motions are responsible for the filament reorientation and, here ...
  • Filament Eruption from Active Region 13283 Leading to a Fast Halo-CME and an Intense Geomagnetic Storm on 2023 April 23 
    Vemareddy, P (American Astronomical Society, 2024-02-01)
    Using multi-instrument and multiwavelength observations, we studied a coronal mass ejection (CME) that led to an intense geomagnetic storm on 2023 April 23. The eruption occurred on April 21 in solar active region (AR) ...
  • Filament Eruption in Association with Rotational Motion Near the Filament Footpoints 
    Dhara, Sajal Kumar; Ravindra, B; Banyal, R. K (Elsevier B.V., 2014-01)
    The active region magnetic field surrounding the filament plays an important role in filament formation, their evolution and disruption. We investigated a filament eruption that occurred in southern hemisphere of the Sun ...
  • Filamentary network and magnetic field structures revealed with BISTRO in the highmass star-forming region NGC 2264: global properties and local magnetogravitational configurations 
    Wang, Jia-Wei; Koch, Patrick M; Clarke, Seamus D; Fuller, Gary; Peretto, Nicolas; Tang, Ya-Wen; Yen, Hsi-Wei; Lai, Shih-Ping; Ohashi, Nagayoshi; Arzoumanian, Doris; Johnstone, Doug; Cho, Jungyeon; Liu, Hong-Li; Fanciullo, Lapo; Hwang, Jihye; Pattle, Kate; Poidevin, Frederick; Tahani, Mehrnoosh; Onaka, Takashi; Rawlings, Mark G; Chung, Eun Jung; Lin, Sheng-Jun; Liu, Junhao; Choi, Minho; Lyo, A-Ran; Priestley, Felix; Hoang, Thiem; Tamura, Motohide; Berry, David; Bastien, Pierre; Ching, Tao-Chung; Coude, Simon; Konyves, Vera; Kwon, Woojin; Chen, Mike; Choi, Yunhee; Eswaraiah, Chakali; Archana Soam; Hasegawa, Tetsuo; Qiu, Keping; Bourke, Tyler L; Byun, Do-Young; Chen, Zhiwei; Kang, Ji-hyun; Choi, Youngwoo; Chrysostomou, Antonio; Dai, Sophia; Francesco, James Di; Diep, Pham Ngoc; Li, Guangxing; Doi, Yasuo; Duan, Yan; Duan, Hao-Yuan; Eden, David; Kang, Miju; Fiege, Jason; Fissel, Laura M; Franzmann, Erica; Friberg, Per; Friesen, Rachel; Gledhill, Tim; Li, Di; Graves, Sarah; Greaves, Jane; Griffin, Matt; Karoly, Janik; Gu, Qilao; Han, Ilseung; Hayashi, Saeko; Houde, Martin; Inoue, Tsuyoshi; Iwasaki, Kazunari; Jeong, Il-Gyo; Kataoka, Akimasa; Kawabata, Koji; Khan, Zacariyya; Kim, Mi-Ryang; Kim, Kee-Tae; Lee, Chang Won; Kim, Kyoung Hee; Liu, Tie; Kim, Shinyoung; Kim, Jongsoo; Kim, Hyosung; Kim, Gwanjeong; Kirchschlager, Florian; Kirk, Jason; Kobayashi, Masato I. N; Kusune, Takayoshi; Tang, Xindi; Kwon, Jungmi; Lacaille, Kevin; Liu, Sheng-Yuan; Law, Chi-Yan; Lee, Sang-Sung; Lee, Hyeseung; Lee, Jeong-Eun; Lee, Chin-Fei; Li, Dalei; Li, Hua-bai; Thuong, Hoang Duc; Lu, Xing; Mairs, Steve; Matsumura, Masafumi; Matthews, Brenda; Moriarty-Schieven, Gerald; Furuya, Ray; Nagata, Tetsuya; Nakamura, Fumitaka; Nakanishi, Hiroyuki; Ngoc, Nguyen Bich; Tomisaka, Kohji; Park, Geumsook; Parsons, Harriet; Pyo, Tae-Soo; Qian, Lei; Rao, Ramprasad; Rawlings, Jonathan; Inutsuka, Shu-ichiro; Retter, Brendan; Richer, John; Rigby, Andrew; Tram, Le Ngoc; Sadavoy, Sarah; Saito, Hiro; Savini, Giorgio; Seta, Masumichi; Sharma, Ekta; Shimajiri, Yoshito; Shinnaga, Hiroko; Tsukamoto, Yusuke; Viti, Serena; Wang, Hongchi; Whitworth, Anthony; Wu, Jintai; Chen, Huei-Ru Vivien; Xie, Jinjin; Ward-Thompson, Derek; Yang, Meng-Zhe; Yoo, Hyunju; Yuan, Jinghua; Yun, Hyeong-Sik; Zenko, Tetsuya; Zhang, Chuan-Peng; Zhang, Yapeng; Zhang, Guoyin; Chen, Wen Ping; Zhou, Jianjun; Zhu, Lei; Gouellec, Valentin J. M. Le; Looze, Ilse de; Andre, Philippe; Dowell, C. Darren; Eyres, Stewart; Falle, Sam; Robitaille, Jean-Francois; Loo, Sven van (American Astronomical Society, 2024-02-20)
    We report 850 μm continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of the B-fields In STar forming Regions Observations large program on the James Clerk Maxwell ...
  • Filling factor determinations and their effects on planetary nebula studies 
    Mallik, D. C. V; Peimbert, M (Instituto de Astronomía, 1988-12)
    The authors have computed the filling factor for a sample of thirty-five galactic PN for which there are distance estimates independent of statistical arguments. They found that about half of the PN in their sample have ...
  • Filter disk rotator 
    Gupta, S. K; Nautiyal, S. L; Negi, B. S (Astronomical Society of India, 1994)
    A filter disk rotator has been designed and developed in the electronics laboratory of Uttar Pradesh State Observatory (UPSO) for photometric observations. A stepper motor is used to rotate the filter disk in the forward ...
  • Filters for NIR astronomical photometry: comparison of commercial IRWG filters and designs using OpenFilters 
    Mishra, Anwesh Kumar; Kamath, U. S (Indian Academy of Sciences, 2022-06)
    The photometric accuracy in the near-infrared (NIR) wavelength range (0.9–2.6 lm) is strongly affected by the variability of atmospheric transmission. The Infrared Working Group (IRWG) has recommended filters that help ...
  • The final state of an evaporating black hole and the dimensionality of the space-time 
    de Sabbata, V; Sivaram, C (D. Reidel Publishing Company, 1990)
  • Finding the Critical Decay Index in Solar Prominence Eruptions 
    Vasantharaju, N.; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2019-11)
    The background fi eld is assumed to play a prime role in erupting structures like prominences. In the fl ux rope models, the critical decay index ( n c ) is a measure of the rate at which background fi eld ...

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