Volume 618, October 2018
|Number of page(s)||21|
|Section||Catalogs and data|
|Published online||24 October 2018|
An atlas of cool supergiants from the Magellanic Clouds and typical interlopers
A guide for the classification of luminous red stars⋆
Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Carretera de San Vicente s/n, San Vicente del Raspeig, 03690 Alicante, Spain
2 Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
Accepted: 5 July 2018
We present an atlas composed of more than 1500 spectra of late-type stars (spectral types from G to M) observed simultaneously in the optical and calcium triplet spectral ranges. These spectra were obtained as part of a survey to search for cool supergiants in the Magellanic Clouds and were taken over four epochs. We provide the spectral and luminosity classification for each spectrum (71% are supergiants, 13% are giants or luminous giants, 4% are carbon or S stars, and the remaining 12% are foreground stars of lesser luminosities). We also provide a detailed guide for the spectral classification of luminous late-type stars, the result of the extensive classification work done for the atlas. Although this guide is based on classical criteria, we have put them together and re-elaborated them for modern CCD-spectra as these criteria were scattered among many different works and mainly conceived for use with photographic plate spectra. The result is a systematic, well-tested process for identifying and classifying luminous late-type stars, illustrated with CCD spectra of standard stars and the classifications of our own catalogue.
Key words: atlases / stars: late-type / supergiants / stars: massive / Magellanic Clouds
Table D.1 and the atlas spectra are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/618/A137
© ESO 2018
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