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Browsing by Subject "Be"

Browsing by Subject "Be"

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  • Be phenomenon in open clusters: results from a survey of emission-line stars in young open clusters 
    Mathew, B; Subramaniam, A; Bhatt, B. C (The Royal Astronomical Society, 2008-08)
    Emission-line stars in young open clusters are identified to study their properties, as a function of age, spectral type and evolutionary state. 207 open star clusters were observed using the slitless spectroscopy method ...
  • Binarity among objects with the Be and B[e] phenomena 
    Miroshnichenko, A. S; Zharikov, S.V; Korcakova, D; Manset, N; Mennickent, R; Khokhlov, S. A; Danford, S; Raj, A; Zakhozhay, O.V (Astronomical Institute of the Slovak Academy of Sciences, 2020-03)
    Many B-type stars exhibit two phenomena that are symbolized Be and B[e]. The former refers to presence of a circumstellar gaseous disk without significant circumstellar dust, while the latter have dust. Although neither ...
  • Large-scale wind structures in OB supergiants: a search for rotationally modulated Hα variability 
    Morel, T; Marchenko, S. V; Pati, A. K; Kuppuswamy, K; Carini, M. T; Wood, E; Zimmerman, R (The Royal Astronomical Society, 2004-06)
    We present the results of a long-term monitoring campaign of the Hα line in a sample of bright OB supergiants (O7.5-B9) which aims at detecting rotationally modulated changes potentially related to the existence of large-scale ...
  • Optical spectroscopic and 2MASS measurements of Stephenson Halpha stars 
    Maheswar, G; Manoj, P; Bhatt, H. C (European Southern Observatory, 2003-05)
    We present the results of spectroscopic observations for 52 objects from the list of Halpha emission stars of Stephenson (\cite{Ste86}). Out of six known T Tauri stars observed, five showed Halpha in emission and in one ...
  • Optical Spectroscopy of Classical Be Stars in Old Open Clusters 
    Jagadeesh, Madhu Kashyap; Mathew, Blesson; Paul, K. T; Banerjee, Gourav; Bhattacharyya, Suman; Anusha, R; Pramod Kumar, S (IOP Publishing, 2023-03)
    We performed the optical spectroscopy of 16 classical Be stars in 11 open clusters older than 100 Myr. Ours is the first spectroscopic study of classical Be stars in open clusters older than 100 Myr. We found that the Hα ...
  • Optical spectroscopy of Galactic field classical Be stars 
    Banerjee, G; Mathew, B; Paul, K. T; Subramaniam, A; Bhattacharyya, S; Anusha, R (Oxford University Press on behalf of the Royal Astronomical Society, 2021-01)
    In this study, we analyse the emission lines of different species present in 118 Galactic field classical Be stars in the wavelength range of 3800–9000 Å. We re-estimated the extinction parameter (AV) for our sample stars ...
  • Pre-main sequence stars, emission stars and recent star formation in the Cygnus region 
    Bhavya, B; Mathew, B; Subramaniam, A (Astronomical Society of India, 2007-09)
    The recent star formation history in the Cygnus region is studied using 5 clusters (IC 4996, NGC 6910, Berkeley 87, Biurakan 2 and Berkeley 86). The optical data from the literature are combined with the 2MASS data to ...
  • Short-Term H α Line Variations in Classical Be Stars: 59 Cyg and OT Gem 
    Paul, K. T; Shruthi, S. B; Subramaniam, A (Indian Academy of Sciences, 2017-03)
    We present the optical spectroscopic study of two classical Be stars, 59 Cyg and OT Gem obtained over a period of few months in 2009. We detected a rare triple-peak H α emission phase in 59 Cyg and a rapid decrease in the ...

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