Line identification in the Ca II K spectral region of sharp-lined B-type stars

Details Line identification in the Ca II K spectral region of sharp-lined B-type stars Line identification in the Ca II K spectral region of sharp-lined B-type stars

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...370..996l&link_type=abstract

Astronomy and Astrophysics, v.370, p.996-999 (2001)

Astronomy and Astrophysics

Astrophysics

1

Line: Identification, Stars: Early-Type, Stars: Individual: Hd 83206, Hd 135485, Ism: Individual Object: High-Velocity Clouds

Scientific paper

Previous Ca Ii K observations of the B-type star HD 83206 have revealed putative high-velocity interstellar clouds (HVCs) at Local Standard of Rest (LSR) velocities of -80 and -110 kms-1. Similar results were also found for the sightline towards HD 135485. In this article, we show that these absorption lines are in fact due to stellar S Ii features. As the Ca Ii K absorption line in B-type stars is often used to assess the presence and distance of HVCs, we also present a very high quality spectrum of HD 83206 in the Ca Ii K region ( ~ +/- 4 Å or +/- 300 kms-1), so that in the future confusion between stellar lines and HVC features may be avoided.

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