Evidence for disks around certain luminous Magellanic cloud stars from the study of FeII
نویسندگان
چکیده
منابع مشابه
Luminous carbon stars in the Magellanic Clouds?
We present ground-based 3 μm spectra of obscured Asymptotic Giant Branch (AGB) stars in the Magellanic Clouds (MCs). We identify the carbon stars on the basis of the 3.1 μm absorption by HCN and C2H2 molecules. We show evidence for the existence of carbon stars up to the highest AGB luminosities (Mbol = −7 mag, for a distance modulus to the LMC of 18.7 mag). This proves that Hot Bottom Burning ...
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In recent years, B stars have been established as reliable tracers of present day abundance patterns. They yield an independent set of abundances from He to Fe which can be cross-checked against other sources such as H ii regions and cool supergiants. In this paper, we present purely spectroscopic analyses of 9 non-supergiant B stars (13 < mV < 15), 5 of which located in the young populous clus...
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Recent observations of blue stragglers by O. De Marco et al. have revealed continuum deficits on the blue side of the Balmer discontinuity, leading these authors to infer the presence of disks around the stars. This intriguing possibility may throw light on aspects of the mechanisms responsible for at least some of these objects; current theories of blue straggler formation invoke stellar colli...
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We have carried out a high-sensitivity search for circumstellar disks around Herbig Be stars in the continuum at 1.4mm and 2.7mm using the IRAM interferometer at the Plateau de Bure (PdBI) . In this letter, we report data on three well studied B0 stars, MWC 1080, MWC 137 and R Mon. The two latter have also been observed in the continuum at 0.7 cm and 1.3 cm using the NRAO Very Large Array (VLA)...
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We present ultraviolet spectra from the Space Telescope Imaging Spectrograph (STIS) of 12 early B-type stars in the Small Magellanic Cloud (SMC), comprising 9 supergiants and 3 giants. A morphological comparison with Galactic analogues is made using archival data from the International Ultraviolet Explorer (IUE). In general, the intensity of the P Cygni emission in the UV resonance lines is gre...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1987
ISSN: 0074-1809
DOI: 10.1017/s0074180900156931