학술논문
TU Tau B: The Peculiar 'Eclipse' of a Possible Proto-barium Giant
Document Type
article
Author
Richard O. Gray; Christopher J. Corbally; Michael M. Briley; Adam McKay; Forrest Sims; David Boyd; Christophe Boussin; Courtney E. McGahee; Robert Buchheim; Gary Walker; David Iadevaia; David Cejudo Fernandez; Damien Lemay; Jack Martin; Jim Grubb; Albert Stiewing; Joseph Daglen; Keith Shank; Sydney Andrews; Nick Barnhardt; Rebekah Clark; Hunter Corman; Sabina Gomes; Agastya Jonnalagadda; Theo McDaries; Ava Mills; Will Newsom; Andrew Slate; Michael Watts
Source
The Astronomical Journal, Vol 166, Iss 4, p 161 (2023)
Subject
Language
English
ISSN
1538-3881
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 the A star was gradual and irregular, with one or more brief brightenings, implying the presence of nonhomogeneities in the carbon star outflow. We also present evidence that the A star is actively accreting s -process enriched material from the carbon star and suggest that it will therefore eventually evolve into a Barium giant. This is an important system as well because the A-type star can serve as a probe of the outer atmosphere of the carbon star.