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Browsing IIAP Publications by Subject "Radial velocity"

Browsing IIAP Publications by Subject "Radial velocity"

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  • Dynamics of Photospheric Magnetic Flux Distribution and Variations in Solar RVs: A Study Using HARPS-N Solar and SDO Observations 
    Sen, Anisha; Rajaguru, S. P (American Astronomical Society, 2023-10-20)
    The distribution and evolution of photospheric magnetic fields in sunspots, plages, and network, and variations in their relative flux content, play key roles in radial velocity (RV) fluctuations observed in Sun-as-a-star ...
  • The eccentric double-lined binary BD - 1 deg 1004 
    Kameswara Rao, N; Ashoka, B. N; Lloyd, C; Pike, C. D; Stickland, D. J (Indian Academy of Sciences, 1990-12)
    A new radial velocity study has been made of the highly eccentric, early-type binary BD - 1 deg 1004 using spectra from the Kavalur Observatory. All available archival material has also been reexamined. An attempt has been ...
  • Eclipse observations of coronal emission lines. I.[FeX]6374 A profiles at the eclipse of 16 February 1980 
    Singh, J; Bappu, M. K. V; Saxena, A. K (Indian Academy of Sciences, 1982-09)
    Coronal spectra during the total solar eclipse of February 16, 1980, obtained in the 6374 A (forbidden Fe X) line using a multislit spectrograph are discussed. The dispersion of these spectra is 2.5 A/mm. The observed line ...
  • Estimation and correction of the instrumental perturbations of Vainu Bappu Telescope Echelle spectrograph using a model-based approach 
    Chamarthi, Sireesha; Banyal, R. K; Sriram, S (SPIE-The International Society for Optical Engineering, 2019-11)
    The Echelle spectrograph operating at Vainu Bappu Telescope (VBT), India, is a general purpose instrument used for many high-resolution spectroscopic observations. A concerted effort is being made to expand the scientific ...
  • Evolution of the optical spectrum of SN 1987a in the Large Magellanic Cloud 
    Ashoka, B. N; Anupama, G. C; Prabhu, T. P; Giridhar, S; Ghosh, K. K; Jain, S. K; Pati, A. K; Kameswara Rao, N (Indian Academy of Sciences, 1987-06)
    The evolution of the spectrum of SN 1987a is traced from 1987 February 26 to March 31. Based on the low-resolution spectroscopic data the authors identify the lines of H, He I, Na I, Fe II, Sc II, Ca II which are known to ...
  • The He II line 4686 in WN binaries 
    Shylaja, B. S (Indian Academy of Sciences, 1987-06)
    The behaviour of the λ4686 line of He II in various WN binaries is studied for variations in total flux as well as radial velocities. It appears that the true motion of the WN component is not depicted by this line especially ...
  • High resolution spectroscopy of R Coronae Borealis during the 1988-1989 minimum 
    Lambert, D. L; Kameswara Rao, N; Giridhar, S (Indian Academy of Sciences, 1990-12)
    Moderate-resolution spectra of the C2 Swan 0-1 bandhead, the Na I D lines and the K I resonance lines near 7660 A obtained at minimum light during the 1988-1989 decline of R CrB are discussed and interpreted in terms of a ...
  • Kinematic studies of five galactic planetary nebulae 
    Banerjee, D. P. K; Anandarao, B. G; Jain, S. K; Mallik, D. C. V (The European Southern Observatory, 1990-12)
    High-resolution Fabry-Perot observations have been made to determine the velocity structure of five PNe and to subsequently relate the observations to the morphology of the objects. New kinematic data on one of these PNe, ...
  • On the absolute magnitude of V482 Cygni, an R Coronae Borealis star 
    Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 1993-06)
    An identification of V482 Cygni, a R Coronae Borealis star, with a quadruple system containing a K5 III star is rejected. High-resolution spectra show that the radial velocity of V482 Cyg and the K5 III star differ by 35 ...
  • Revisiting the Transit Timing Variations in the TrES-3 and Qatar-1 Systems with TESS Data 
    Mannaday, Vineet Kumar; Thakur, Parijat; Southworth, John; Jiang, Ing-Guey; Sahu, D. K; Mancini, L; Vanko, M; Kundra, Emil; Gajdos, Pavol; A-thano, Napaporn; Sariya, Devesh P; Yeh, Li-Chin; Griv, Evgeny; Mkrtichian, David; Shlyapnikov, Aleksey (American Astronomical Society, 2022-11-01)
    We present and analyze 58 transit light curves of TrES-3b and 98 transit light curves of Qatar-1b, observed by the Transiting Exoplanet Survey Satellite, plus two transit light curves of Qatar-1b, observed by us, using a ...
  • Spectral Variations of DY Cen 
    Giridhar, S; Kameswara Rao, N; Lambert, D. L (Indaian Academy of Sciences, 1996-06)
    Two high resolution spectra of the hot RCrB star DY Cen in the red region are compared. The photospheric absorption lines show a radial velocity variation of 12 km s(sup -1) between 1989 July and 1992 May. Emission components ...
  • The TESS-Keck Survey. VIII. Confirmation of a Transiting Giant Planet on an Eccentric 261 Day Orbit with the Automated Planet Finder Telescope 
    Dalba, Paul A; Kane, Stephen R; Dragomir, Diana; Villanueva Jr, Steven; Collins, Karen A; Jacobs, Thomas Lee; LaCourse, Daryll M; Gagliano, Robert; Kristiansen, Martti H; Omohundro, Mark; Schwengeler, Hans M; Terentev, Ivan A; Vanderburg, Andrew; Fulton, Benjamin; Isaacson, Howard; Zandt, Judah Van; Howard, Andrew W; Thorngren, Daniel P; Howell, Steve B; Batalha, Natalie M; Chontos, Ashley; Crossfield, Ian J. M; Dressing, Courtney D.; Huber, Daniel; Petigura, Erik A.; Robertson, Paul; Roy, Arpita; Weiss, Lauren M; Behmard, Aida; Beard, Corey; Brinkman, Casey L; Giacalone, Steven; Hil, Michelle L; Lubin, Jack; Mayo, Andrew W; Mocnik, Teo; Murphy, Joseph M. Akana; Polanski, Alex S; Rice, Malena; Rosenthal, Lee J; Rubenzahl, Ryan A; Scarsdale, Nicholas; Turtelboom, Emma V; Tyler, Dakotah; Benni, Paul; Boyce, Pat; Esposito, Thomas M; Girardin, E; Laloum, Didier; Lewin, Pablo; Mann, Christopher R; Marchis, Franck; Schwarz, Richard P; Srdoc, Gregor; Steuer, Jana; Sivarani, T; Athira Unni; Eisner, Nora L; Fetherolf, Tara; Li, Zhexing; Yao, Xinyu; Pepper, Joshua; Ricker, George R.; Vanderspek, Roland; Latham, David W; Seager, S.; Winn, Joshua N; Jenkins, Jon M; Burke, Christopher J; Eastman, Jason D; Lund, Michael B; Rodriguez, David R; Rowden, Pamela; Ting, Eric B; Villaseñor, Jesus Noel (American Astronomical Society, 2022-02-01)
    We report the discovery of TOI-2180 b, a 2.8 MJ giant planet orbiting a slightly evolved G5 host star. This planet transited only once in Cycle 2 of the primary Transiting Exoplanet Survey Satellite (TESS) mission. Citizen ...

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