Changes in the spectrum of Z Ursae Majoris during its rise through a maximum in 2014 June
2015 May 29
The semiregular variable Z UMa experienced a particularly deep minimum at the end of 2014 March, followed by a three-month rise to maximum. The rise and subsequent decline were followed with low resolution (R~1000) spectroscopy, possibly for the first time. The spectral type of Z UMa varied between M7III at minimum and M4III at maximum, while the bright hydrogen emission lines reported by observers during the last century now appear relatively weak and transitory.
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