The 'remarkable' M31 globular cluster 037–B327 revisited |
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| Authors: | Pauline Barmby Kathryn M Perrett Terry J Bridges |
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| Institution: | 1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA;2Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada;3Anglo‐Australian Observatory, Epping, NSW 1710, Australia |
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| Abstract: | The M31 globular cluster candidate  has long been known to be an extremely red, non-stellar object. The first published spectrum of this object is used to confirm that it is a globular cluster belonging to M31, with rather typical values of  and  . Using the spectroscopic metallicity to predict the intrinsic colours, we derive a reddening value of  , in good agreement with the value obtained using reddening-free parameters. The extinction-corrected magnitude of  is  (absolute magnitude  , which makes it the most luminous globular cluster in M31. We examine van den Bergh's argument regarding the brightest and most-reddened globular cluster in M31; we find that the brightest clusters are more heavily reddened than average, but this can be explained by selection effects rather than a different R V in M31. |
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| Keywords: | globular clusters: general galaxies: individual: M31 galaxies: star clusters |
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