Albert Stiewing

Orbital parameters of the bright binary alpha Draconis based on amateur spectra from the STAROS database

G. Bertrand, C. Buil, M. Le Lain, V. Desnoux et autres

We present the results of a STAROS monitoring campaign on the bright eclipsing binary star alpha Draconis. Over 200 high-resolution spectra were obtained by an international group of amateur astronomers. We were able to calculate an homogeneously covered radial velocity curve and …

TU Tau B: The Peculiar “Eclipse” of a Possible Proto-barium Giant

R. O. Gray, C. J. Corbally, Michael M. Briley, Adam McKay et autres

Abstract TU Tau (=HD 38218 = HIP 27135) is a binary system consisting of a C-N carbon star primary and an A-type secondary. We report on new photometry and spectroscopy which tracked the recent disappearance of the A-star secondary. The dimming of …

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TU Tau B: The Peculiar 'Eclipse' of a possible proto-Barium Giant

R. O. Gray, C. J. Corbally, Michael M. Briley, Adam McKay et autres

TU Tau (= HD 38218 = HIP 27135) is a binary system consisting of a C-N carbon star primary and an A-type secondary. We report on new photometry and spectroscopy which tracked the recent disappearance of the A-star secondary. The dimming of …

Outbursts and stellar properties of the classical Be star HD 6226

Noel D. Richardson, O. Thizy, Jon E. Bjorkman, A. C. Carciofi et autres

ABSTRACT The bright and understudied classical Be star HD 6226 has exhibited multiple outbursts in the last several years during which the star grew a viscous decretion disc. We analyse 659 optical spectra of the system collected from 2017 to 2020, along …

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Evolution of the disk of π Aqr: From near-disappearance to a strong maximum

Yaël Nazé, G. Rauw, Joan Guarro Fló, Arnold de Bruin et autres

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Orion Project Status Report

Albert Stiewing, J. L. Hopkins

Deutsche Patentschriften

Albert Stiewing

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