Results 31 to 40 of about 720,446 (211)
The Astrophysical Journal, 2023 We present the final results of an imaging and spectroscopic search for stars in the Large Magellanic Cloud (LMC) with C ii λλ 7231, 7236 emission lines. The goal is to identify and study [WC11] stars, the coolest of the low-mass Wolf–Rayet sequence, and
Bruce Margon +4 more
doaj +1 more source
Blobs in the Winds of Wolf-Rayet Stars [PDF]
International Astronomical Union Colloquium, 1989 Abstract. Concentrations of material have been observed to propagate in the winds of many W-R stars. These are short-lived, stochastic features of unknown origin.
C. Robert, L. Drissen, A. F. J. Moffat
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Advances in Astronomy, Volume 2013, Issue 1, 2013., 2013 We investigate the spatial distribution of chemical abundances in a sample of low metallicity Wolf‐Rayet (WR) galaxies selected from the SDSS. We used the integral field spectroscopy technique in the optical spectral range (3700 Å–6850 Å) with PMAS attached to the CAHA 3.5 m telescope.
Enrique Pérez-Montero +6 more
wiley +1 more source
The spectra of Wolf-Rayet Stars and related objects. [PDF]
, 1942 New observational data are given for the spectra of several Wolf-Rayet stars. Evidence is produced for the presence of C IV in the WN sequence and for a central reversal of the H, He I, and He II lines. The spectra of two Of stars are described, and some
Swings, Polydore
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A New Galactic Wolf‐Rayet Star in Centaurus
International Scholarly Research Notices, Volume 2011, Issue 1, 2011., 2011 I communicate the detection of a new Galactic Wolf‐Rayet star (WR60a) in Centaurus. The H‐ and K‐band spectra of WR60a show strong carbon near‐infrared emission lines, characteristic of Wolf‐Rayet stars of the WC5‐7 subtype. Adopting mean absolute magnitude MK and mean intrinsic (J‐KS) and (H‐KS) colours, it was found that WR60a suffers a mean visual ...
A. Roman-Lopes, J. A. L. Aguerri
wiley +1 more source
Properties of hot stars in the Wolf-Rayet galaxy NGC5253 from ISO-SWS spectroscopy [PDF]
, 1999 ISO-SWS spectroscopy of the Wolf--Rayet galaxy NGC 5253 is presented, and analysed to provide estimates of its hot young star population. Our approach differs from previous investigations in that we are able to distinguish between the regions in which ...
Morris, PW +11 more
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The Software for the Robotization of the TROBAR Telescope
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 The Telescopi ROBotic de ARas (TROBAR) is a new robotic facility built at Aras de Los Olmos (Valencia, Spain). This is a 60 cm telescope equipped with a 4 k × 4 k optical camera, corresponding to 30 × 30 arcmin2 FoV, and it will be primarily used for a systematic search of Ha emitting stars in the Galactic Plane to a depth of ≈14 mag.
Mauro Stefanon, Taro Kotani
wiley +1 more source
Wolf-Rayet Stars and GRB Connection [PDF]
, 2006 10 pages, 4 ps figures, LATEX. Abridged English version of paper in Astronomy Reports (2001, in press). Also to appear in Proc. 2d Rome Workshop "GRBs in the Afterglow Era"
Cherepashchuk, A. M., Postnov, K. A.
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Analysis of 30 Wolf-Rayet stars [PDF]
International Astronomical Union Colloquium, 1988 Temperatures, mass-loss rates and luminosities of 30 galactic Wolf-Rayet stars (24 WN, 6 WC) are derived by fitting the observed equivalent widths of He I λ5876 and He II λ5412 and the absolute visual magnitude. A three-dimensional grid (T*-R*-) of model calculations provides the theoretical values.The results are summarized in Figure 1.
W. Schmutz, W.-R. Hamann, U. Wessolowski
openaire +1 more source
On the ring nebulae around runaway Wolf–Rayet stars
, 2020 Wolf–Rayet stars are advanced evolutionary stages of massive stars. Despite their large mass-loss rates and high wind velocities, none of them displays a bow shock, although a fraction of them are classified as runaway. Our 2.5-D numerical simulations of
Petrov, M. +10 more
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