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The blue supergiant Sher 25 and its intriguing hourglass nebula Oxford JournalsScience & Mathematics MNRAS Volume 388, Issue 3Pp. 1127-1142, M. A. Hendry1,2, S. J. Smartt1,*, E. D. Skillman3, C. J. Evans4, C. Trundle1, D. J. Lennon5,6, P. A. Crowther7 and I. Hunter1, In original form 2008 January 23. Received 2008 March 17. Accepted 2008 April 2. First published online August 11, 2008