Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.334l..33c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 334, Issue 2, pp. L33-L37.
Astronomy and Astrophysics
Astronomy
13
Stars: Individual: Κ Vel (Hd 81188), Ism: Structure
Scientific paper
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I report the detection of interstellar CaI and CH at the velocity of the previously reported variable absorption component towards κ Velorum (HD 81188). The very high spectral resolution (R~ 900 000) has resolved the intrinsic line profiles, yielding a kinetic temperature of Tk= 190+170-150 K, and a line-of-sight tubulent velocity of vt= 0.26+0.08-0.13 km s-1, for the densest material. The CaI/CaII ratio implies a spatial density of nH>~ 103 cm-3, although this may considerably underestimate the density in the variable region itself. The CH column density suggests a path-length of ~102 to 103 au, supporting suggestions that variable interstellar components such as this are formed in extended structures (sheets or filaments) aligned with the line of sight.
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