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Feige 86: Gaia confirms its Horizontal Branch nature
Bonifacio, P.; Monaco, L.
The halo star Feige 86 was considered in the 1960's and 1970's a solar metallicity chemically peculiar, He-weak B type star. Margherita Hack was the first to study its UV spectrum acquired with the IUE satellite. Later studies of this star by Hack and collaborators suggested that, in spite of the fact its iron abundance is slightly above solar, th…
Young Stellar Distance Indicators and the Extragalactic Distance Scale
Anderson, R.
The extragalactic distance scale is perhaps the most important application of stellar distance indicators. Among these, classical Cepheids are high-accuracy standard candles that support a $1.4\%$ measurement of Hubble's constant, $H_0$. The accuracy of Cepheid distances is thus directly relevant for understanding the implications of the Hubble te…