Light variations of the blue hypergiants HD 168607 and HD 168625 (1973-1999)

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stars: Early-Type, Stars: Individual: Hd 168607, Stars: Individual: Hd 168625, Stars: Oscillations, Stars: Variables: General

Scientific paper

Strömgren differential photometry of HD 168607 and HD 168625 collected during the previous 27 years is analysed. We bring to an end our quarter of a century monitoring of these objects and conclude that HD 168607 shows typical variability of an uneventful LBV, whereas HD 168625 remains to be classified as a variable hypergiant, or a marginally-dormant LBV. The long-term light- and colour behaviour of HD 168607 indicates the possible presence of a very slowly-developing S Dor phase - that is, a bright phase that coincides with redder colours. Besides the alpha Cygni-type microvariability, no other signs of ultrashort-periodic variability has been observed. Based on observations obtained at the European Southern Observatory at La Silla, Chile (applications ESO 56D-0249, 58D-0118, 60D-0148, 61D-0128 and 62H-0110)

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