κ Velorum: another variable interstellar sightline?

I. A. Crawford*, I. D. Howarth, S. D. Ryder, R. A. Stathakis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We present ultra-high-resolution (R = 900 000) observations of interstellar Na I and K I absorption lines towards κ Vel (HD 81188) which show clear evidence for temporal variation between 1994 and 2000. Specifically, the column densities of K0 and Na0 in the main velocity component have increased by 40 and 16 per cent, respectively, over this period. Earlier work had suggested that this component actually consists of two unresolved sub-components; this result is confirmed here, and the overall line profile is found to be consistent with only one of these sub-components having increased in strength since 1994. We argue that this variation is consistent with the line of sight gradually probing a cold, dense interstellar filament of the kind recently proposed by Heiles to explain other observations of small-scale structure in the interstellar medium.

Original languageEnglish
Pages (from-to)L1-L6
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume319
Issue number2
DOIs
Publication statusPublished - 1 Dec 2000
Externally publishedYes

Keywords

  • Stars: individual: κ Vel (HD 81188)
  • ISM: atoms
  • ISM: structure

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