UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

κ Velorum: Another variable interstellar sightline?

Crawford, IA; Howarth, ID; Ryder, SD; Stathakis, RA; (2000) κ Velorum: Another variable interstellar sightline? Monthly Notices of the Royal Astronomical Society , 319 (2) L1 - L6. 10.1046/j.1365-8711.2000.04005.x. Green open access

[thumbnail of 1366147.pdf]
Preview
PDF
1366147.pdf

Download (327kB)

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.

Type: Article
Title: κ Velorum: Another variable interstellar sightline?
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.2000.04005.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.2000.04005.x
Language: English
Additional information: © 2000 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1366147
Downloads since deposit
77Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item