Open AccessThe ‘remarkable’ M31 globular cluster 037–B327 revisited
Author(s) -
Barmby Pauline,
Perrett Kathryn M.,
Bridges Terry J.
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.04993.x
Subject(s) - globular cluster , physics , astrophysics , metallicity , extinction (optical mineralogy) , cluster (spacecraft) , absolute magnitude , horizontal branch , astronomy , magnitude (astronomy) , star cluster , stars , computer science , optics , programming language
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.