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

Detection of a variable interstellar absorption component towards δ Orionis A

Price, RJ; Crawford, IA; Barlow, MJ; (2000) Detection of a variable interstellar absorption component towards δ Orionis A. Monthly Notices of the Royal Astronomical Society , 312 (3) L43-L48. 10.1046/j.1365-8711.2000.03337.x. Green open access

[thumbnail of price00_deltaOriMNRAS312L43.pdf]
Preview
Text
price00_deltaOriMNRAS312L43.pdf - Published version

Download (154kB) | Preview

Abstract

Observations of δ Ori A made with the UHRF in its highest resolution mode (R≈900 000) have revealed the presence of a cool (Tk⩽350 K) variable absorption component at a heliocentric velocity of +21.3 km s−1. The component is detected in Na I D1, where clear hyperfine splitting is seen, and Ca II 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 H I shell surrounding the Orion-Eridanus superbubble.

Type: Article
Title: Detection of a variable interstellar absorption component towards δ Orionis A
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.2000.03337.x
Publisher version: https://doi.org/10.1046/j.1365-8711.2000.03337.x
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
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/10096061
Downloads since deposit
17Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item