Browsing by Subject "Stars: Early-Type"

Now showing items 1-3 of 3

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 ...
Low resolution spectroscopy of hot post-AGB candidates

Parthasarathy, M; Vijapurkar, J; Drilling, J. S (EDP Sciences, 2000-08)

Spectral types are determined from low resolution optical spectra of 40 IRAS sources with far-infrared colours similar to planetary nebulae. The presence of circumstellar dust, high galactic latitude, and early supergiant ...
Low resolution spectroscopy of ISOGAL sources: Search for early-type stars with infrared excess

Schultheis, M; Parthasarathy, M; Omont, A; Cohen, M; Ganesh, S; Sevre, F; Simon, G (E D P Sciences, 2002-05)

An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7-15 mu m excesses are found to be B and A-type stars, some of ...

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