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On Lifetimes of Dusty Debris Disks around A-type Stars
(IAU Editorial, 2014-01)
The circumstellar environment of the star V923 Aquilae
(EDP Sciences, 2004-04)
V923 Aquilae is a Be shell star that displays emission in Hα, cyclic V/R variations and variations in the intensity of the near infrared continuum. The star presents radial velocity variations arising from a superposition ...
VLTI/MIDI observations of the circumstellar shell of an AGB star: W Hydrae
(Perrin, G.Malbet, F.Les Houches, 2003)
W Hydrae is a prototype AGB star with a dusty circumstellar shell. The shell is marginally resolved at ground-based subarcsecond resolution; the unresolved dust condensation radius is expected to be of order 30 50 mas. ...
Atomic gas in debris discs
(Oxford University, 2017)
We have conducted a search for optical circumstellar absorption lines in the spectra of 16 debris disc host stars. None of the stars in our sample showed signs of emission line activity in either Hα, CaII or Na I, confirming ...
Simultaneous K and L-band spectroscopy of Be stars: circumstellar envelope properties from hydrogen emission lines
(Iop Publishing, 2010-04)
We present medium-resolution K- and L-band spectra of a sample of eight Be stars, obtained with Gemini/ NIRI. The IR K and L bands contain many lines of different hydrogen series that are used as a diagnosis to the physical ...