Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..255h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 255-259.
Astronomy and Astrophysics
Astrophysics
26
A Stars, Astronomical Spectroscopy, Early Stars, Shell Stars, Stellar Envelopes, Stellar Spectra, Absorption Spectra, Charge Coupled Devices, High Resolution, Line Spectra, Spectrum Analysis, Visible Spectrum
Scientific paper
CCD observations of diagnostic features in the optical spectra of eight southern Lambda Boo stars and one normal A star are presented. The general weakness of MgII 4481A is confirmed, yet a wide range in strength and magnesium abundance exists. Narrow interstellar or circumstellar absorption components of NaI 5890 + 5896A are detected in three stars; in HR 4881 they exceed in strength those of the shell star Beta Pictoris and are probably of circumstellar origin. HR 4881 also exhibits a conspicuous absorption feature in CaII 3933A, resembling Beta Pic in appearance.
Holweger Hartmut
Stuerenburg S.
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