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Browsing by Author "Reddy, B. E"

Browsing by Author "Reddy, B. E"

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  • A 10-m class national large optical-IR telescope 
    Anupama, G. C; Maheswar, G; Sriram, S; Sivarani, T; Parihar, P. S; Nagabhushana, S; Angchuk, D; Barway, Sudhanshu; Bhatt, B. C; Banyal, R. K; Basheer, Alikhan; Prasanna, Deshmukh; Divakar, D. K; Dorjai, T; Goswami, A; Govinda, K. V; Jorphail, S; Kamath, U. S; Kemkar, P. M. M; Mahay, T. T; Muneer, S; Muthumariappan, C; Shantikumar, N. S; Pandey, G; Reddy, B. E; Sahu, D. K; Sandeep, D. S; Ramya, S; Stalin, C. S; Subramanian, S; Tsewang, Stanzin; Subramaniam, A (Indian Academy of Science, 2022-06)
    An observatory class national large optical-IR telescope (NLOT), is proposed to be built and located in the country. The telescope consists of a 10–12 m segmented primary. In order to cater to a diversity of observational ...
  • 1D radiative transfer models of 21 and 30 μm emission features in proto-planetary nebulae 
    Muthumariappan, C; Reddy, B. E (Cambridge University Press, 2012-08)
    Spectral energy distributions of six proto-planetary nebulae showing 21 and 30μ features were fit with models obtained from 1D radiative transfer code, taking FeO and MgS respectively are the carriers of the features. ...
  • Abundance Analyses of Field RV Tauri Stars. VI. An Extended Sample 
    Giridhar, S; Lambert, D. L; Reddy, B. E; Gonzalez, G; Yong, D (University of Chicago Press, 2005-07)
    An abundance analysis is presented and discussed for a sample of 14 RV Tauri stars. The present abundance data and those from our previous papers and by other workers are combined in an attempt to further understanding of ...
  • Abundance analyses of Li-enriched and normal giants in the GALAH survey 
    Deepak; Lambert, D. L; Reddy, B. E (Oxford University Press on behalf of the Royal Astronomical Society, 2020-05)
    Compositions of lithium-enriched and normal giants among the GALAH survey are compared. Except for Li, the only detectable abundance difference between lithium-enriched and normal giants among the investigated elements ...
  • Abundance analysis of the cool extreme helium star LSS3378 
    Pandey, G; Reddy, B. E (Blackwell Publishing, 2006-07)
    Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is presented. The abundance analysis is done using local thermodynamic equilibrium (LTE) line formation and LTE model atmospheres constructed for EHe ...
  • The Active Chromospheres of Lithium-rich Red Giant Stars* 
    Sneden, Christopher; Afsar, Melike; Bozkurt, Zeynep; Adamow, Monika; Mallick, Anohita; Reddy, B. E; Janowiecki, Steven; Mahadevan, Suvrath; Bowler, Brendan P; Hawkins, Keith; Lind, Karin; Dupree, Andrea K; Ninan, Joe P; Nagarajan, Neel; Topcu, Gamze Bocek; Froning, Cynthia S; Bender, Chad F; Terrien, Ryan; Ramsey, Lawrence W; Mace, Gregory N (American Astronomical Society, 2022-11-20)
    We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their He I λ10830 absorption strengths. This transition is an indicator ...
  • Asteroseismology Sheds Light on the Origin of Carbon-deficient Red Giants: Likely Merger Products and Linked to the Li-rich Giants 
    Maben, Sunayana; Campbel, Simon W; Bharat Kumar, Y; Reddy, B. E; Zhao, Gang (IOP Publishing, 2023-11-01)
    Carbon-deficient red giants (CDGs) are a peculiar class of stars that have eluded explanation for decades. We aim to better characterize CDGs by using asteroseismology (Kepler, TESS) combined with spectroscopy (APOGEE, LAMOST), ...
  • Breaking up of a comet by Jupiter 
    Kameswara Rao, N; Mayya, Y. D; Reddy, B. E; Prabhu, T. P (Astronomical Society of India, 1993-09)
  • CCD photometry and spectroscopy of 14 IRAS sources having far-IR colours similar to Planetary Nebulae 
    Reddy, B. E; Parthasarathy, M (International Astronomical Union, 1997)
  • CCD Photometry and Spectroscopy of IRAS Sources Having Far-IR Colors Similar to Planetary Nebulae 
    Reddy, B. E; Parthasarathy, M (American Astronomical society, 1996-11)
    CCD imaging and BVRI photometry of 14 IRAS sources with far-IR colors similar to planetary nebulae and post-AGB stars are presented. Also results of optical and near -IR spectroscopy of 10 of these candidates are given. ...
  • The chemical composition of IRAS 05341+0852: a post-AGB F supergiant with 21 MU M emission 
    Reddy, B. E; Parthasarathy, M; Gonzalez, G; Bakker, E. J (European Southern Observatory, 1997-12)
    An abundance analysis of the photosphere of the F-type Post-AGB candidate IRAS 05341+0852 is presented. The analysis of the spectra suggests that the atmospheric model: Teff=6500 K, log g=0.5, xi_ {t}=5 km s(-1) and ...
  • The chemical composition of IRAS 05341+0852: a post-AGB F supergiant with 21 MU M emission 
    Reddy, B. E; Parthasarathy, M; Gonzalez, G; Bakker, E. J (International Astronomical Union, 1997)
  • The chemical composition of the post-asymptotic giant branch F supergiant CRL 2688 
    Ishigaki, M. N; Parthasarathy, M; Reddy, B. E; García-Lario, P; Takeda, Y; Aoki, W; García-Hernández, D. A; Manchado, A (Wiley-Blackwell, 2012-09)
    We present an analysis of a high-resolution (R ∼ 50 000) optical spectrum of the central region of the protoplanetary nebula CRL 2688. This object is thought to have recently moved off the asymptotic giant branch (AGB) and ...
  • Chemical compositions and kinematics of the Hercules stream 
    Ramya, P; Reddy, B. E; Lambert, D. L; Musthafa, M. M (Oxford University Press on behalf of the Royal Astronomical Society, 2016-08)
    An abundance analysis is reported of 58-K giants identified by Famaey et al. ( 2005 , A&A, 430, 165) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hippar ...
  • Chemical compositions of giants in the Hyades and Sirius superclusters 
    Ramya, P; Reddy, B. E; Lambert, D. L (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    An abundance analysis for 20 elements from Na to Eu is reported for 34 K giants from the Hyades supercluster and for 22 K giants from the Sirius supercluster. Observed giants were identified as highly probable members of ...
  • Chemical compositions of stars in two stellar streams from the Galactic thick disc 
    Ramya, P; Reddy, B. E; Lambert, D. L (Wiley-Blackwell, 2012-10)
    We present abundances for 20 elements for stars in two stellar streams identified by Arifyanto & Fuchs: 18 stars from the Arcturus stream and 26 from a new stream, which we call the AF06 stream, both from the Galactic thick ...
  • Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant 
    Raghubar Singh; Bharat Kumar, Y; Reddy, B. E; Aoki, W (Oxford University Press on behalf of the Royal Astronomical Society, 2020-01)
    Given the implications for the origin of Li enhancement in red giants, we have reviewed the Li-rich classification of KIC 9821622, the only bonafide red giant branch (RGB) giant with a He inert core to date, reported as a ...
  • Decomposition of the Galactic Disk: Abundances and Kinematics 
    Reddy, B. E (Cambridge University Press, 2007-08)
    To this contribution we present a brief review of our recent abundance surveys (Reddy et al. 2003; Reddy et al. 2006) of the Milky Way galaxy. Survey focussed on controlled samples of stars selected based on their kinematic ...
  • Detached cold dust shells around yellow variable supergiants TW Aql, AI CMi, V 925 SCO and related stars 
    Parthasarathy, M; Reddy, B. E (Astronomical Society of India, 1993)
    TW Azl, AI CMi, V 924 Sco, ST Pup, AX Sgr, AD Aql, V1027 Cyg are yellow variable supergiants. We find these stars to be far-infrared (IRAS) sources with flux maximum around 25 micrometers. Analysis of the IRAS fluxes shows ...
  • Discovery of ubiquitous lithium production in low-mass stars 
    Bharat Kumar, Y; Reddy, B. E; Campbell, S. W; Maben, Sunayana; Zhao, G; Ting, Yuan-Sen (Springer Nature, 2020-11)
    The vast majority of stars with mass similar to that of the Sun are expected to destroy lithium (Li) gradually over the course of their lives, via low-temperature nuclear burning. This has now been supported by observations ...

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