125823
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The variations in the spectrum of HD 125823 can be represented by an oscillation between MK types B2 V and B7 IV:, on low-dispersion slit spectrograms. On spectrograms of higher dispersion, lines of both Si in and Siii are present and are sensibly unchanged in intensity throughout the variations. The spectral type determined from the ratio of Si in to Si ii is B2. The star's \"normal\" state appears to be B2 V. At intervals the He i lines become much weaker, with- out an accompanying change in the general level of excitation in the spectrum. At the helium-weak phase the spectrum may resemble the category of \"weak helium-line\" stars noted by Sharpless in Orion and discussed further by Sargent and Searle
Xiaorong Gu, Rita Tohme, Benjamin K. Tomlinson, Lisa Durkin, Caroline Schuerger, Asmaa M Zidan, Tomas Radivoyevitch, Hetty E. Carraway, Ronald Sobecks, Betty K. Hamilton, Alan Lichtin, MD, Jaroslaw P. Maciejewski, Yogenthiran Saunthararajah; Feedback Responses of the Pyrimidine Metabolism Network Mediate Resistance to Decitabine and 5-Azacytidine. Blood 2019; 134 (Supplement_1): 537. doi: -2019-125823 59ce067264
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