Diffuse interstellar bands in M 33

Details Diffuse interstellar bands in M 33 Diffuse interstellar bands in M 33

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...492l...5c&link_type=abstract

Astronomy and Astrophysics, Volume 492, Issue 1, 2008, pp.L5-L8

Astronomy and Astrophysics

Astrophysics

8

Astrochemistry, Galaxies: Local Group, Galaxies: Ism, Ism: Lines And Bands, Ism: Atoms, Ism: Dust, Extinction

Scientific paper

Aims: We investigate the diffuse interstellar band (DIB) spectrum in the interstellar medium of the Local Group spiral galaxy M 33. Methods: Optical spectra of the M 33 supergiant star J013346.96+303642.8 were taken at a resolving power of ~3000 using the DEIMOS spectrograph of the W. M. Keck Observatory. Results: We report the first detection and measurement of DIBs in M 33. The λλ5705, 5780, 5797, 6203, 6269, 6283, and 6613 DIBs are detected at velocities matching the M 33 Na I absorption lines. The λ4428 DIB is tentatively detected. The stellar spectrum is classified as A3 Ia and the line-of-sight interstellar reddening is derived. Diffuse interstellar band (DIB) equivalent widths and radial velocities are presented. Conclusions: The overall spectrum of DIBs observed in M 33 is found to be similar to that observed in the Milky Way. However, along this line-of-sight, the M 33 DIB equivalent widths per unit reddening are large compared with those typically observed in the Galaxy.

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