EDP Sciences
Free access
Issue A&A
Volume 480, Number 1, March II 2008
Page(s) L13 - L16
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20079309



A&A 480, L13-L16 (2008)
DOI: 10.1051/0004-6361:20079309

Letter

Detection of diffuse interstellar bands in M 31

M. A. Cordiner1, N. L. J. Cox2, C. Trundle1, C. J. Evans3, I. Hunter1, N. Przybilla4, F. Bresolin5, and F. Salama6

1  Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, Belfast, BT7 1NN, UK
    e-mail: m.cordiner@qub.ac.uk
2  Herschel Science Centre, European Space Astronomy Centre, ESA, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
3  UK ATC, Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK
4  Dr. Remeis-Sternwarte Bamberg, Sternwartstr. 7, 96049 Bamberg, Germany
5  Institute for Astronomy of the University of Hawaii, 2680 Woodlawn Drive, 96822 Honolulu, HI, USA
6  Space Science Division, NASA Ames Research Center, Mail Stop 245-6, Moffett Field, California 94035, USA

(Received 21 December 2007 / Accepted 22 January 2008)

Abstract
Aims.We investigate the diffuse interstellar band (DIB) spectrum in the interstellar medium of M 31.
Methods. The DEIMOS spectrograph of the W. M. Keck observatory was used to make optical spectroscopic observations of two supergiant stars, MAG 63885 and MAG 70817, in the vicinity of the OB78 association in M 31 where the metallicity is approximately equal to solar.
Results. The $\lambda\lambda$5780, 5797, 6203, 6283 and 6613 DIBs are detected in both sightlines at velocities matching the M 31 interstellar Na I absorption. The spectra are classified and interstellar reddenings are derived for both stars. Diffuse interstellar band (DIB) equivalent widths and radial velocities are presented.
Conclusions. The spectrum of DIBs observed in M 31 towards MAG 63885 is found to be similar to that observed in the Milky Way. Towards MAG 70817 the DIB equivalent widths per unit reddening are about three times the Galactic average. Compared to observations elsewhere in the Universe, relative to reddening the M 31 ISM in the vicinity of OB78 is apparently a highly favourable environment for the formation of DIB carriers.


Key words: astrochemistry -- galaxies: Local Group -- galaxies: ISM -- ISM: lines and bands -- ISM: clouds -- ISM: dust, extinction



© ESO 2008

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)