Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.312l..43p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 312, Issue 3, pp. L43-L48.
Astronomy and Astrophysics
Astronomy
27
Line: Profiles, Stars: Individual: Hd 36486, Ism: Atoms
Scientific paper
Observations of δ Ori A made with the UHRF in its highest resolution mode (R~900000) have revealed the presence of a cool (Tk<=350K) variable absorption component at a heliocentric velocity of +21.3kms-1. The component is detected in Nai D1, where clear hyperfine splitting is seen, and Caii K. Comparison of our data with existing spectra suggests that the component has consistently increased in strength from 1966 to 1994, and subsequently reduced in intensity by 1999. Following a discussion of the possible origins of this component it is concluded that an interstellar, rather than circumstellar, origin is most likely. This is one of very few detections of variable interstellar absorption reported in the literature, and we suggest an origin within filamentary material associated with the expanding Hi shell surrounding the Orion-Eridanus superbubble.
Barlow Michael J.
Crawford Ian A.
Price Richard J.
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