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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 ...
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 ...
Searching for light echoes due to circumstellar matter in SNe la Spectra
(The American Astronomical Society, 2015)
We present an analytical model for light echoes (LEs) coming from circumstellar material (CSM) around Type Ia Supernovae (SNe Ia). Using this model we find two spectral signatures at 4100 angstrom and 6200 angstrom that ...
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 ...