The ‘Giraffe’: discovery of a stripped red giant in an interacting binary with an ∼2 M⊙ lower giant
Article
Article Title | The ‘Giraffe’: discovery of a stripped red giant in an interacting binary with an ∼2 M⊙ lower giant |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Jayasinghe, T., Thompson, Todd A, Kochanek, C S, Stanek, K Z, Rowan, D M, Martin, D V, El-Badry, Kareem, Vallely, P J, Hinkle, J T, Huber, D, Isaacson, H, Tayar, J, Auchettl, K, Ilyin, I, Howard, A W and Badenes, C |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 516 (4), pp. 5945-5963 |
Number of Pages | 19 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac2187 |
Web Address (URL) | https://academic.oup.com/mnras/article/516/4/5945/6657610 |
Abstract | We report the discovery of a stripped giant + lower giant Algol-type binary, 2M04123153+6738486 (2M0412), identified during a search for non-interacting compact object – star binaries. 2M0412 is an evolved (Teff, giant ≃ 4000 K), luminous (Lgiant ≃ 150 L⊙) red giant in a circular P = 81.2 d binary. 2M0412 is a known variable star previously classified as a semiregular variable. The cross-correlation functions of follow-up Keck/HIRES and LBT/Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) spectra show an radial velocity variable second component with implied mass ratio q = Mgiant/Mcomp ≃ 0.20 ± 0.01. The All-Sky Automated Survey for SuperNovae (ASAS-SN), Asteroid Terrestrial-impact Last Alert System (ATLAS), Transiting Exoplanet Survey Telescope ( TESS), and Zwicky Transient Facility (ZTF) light curves show that the giant is a Roche lobe filling ellipsoidal variable with an inclination of 49.4 ± 0.3°, and a giant mass of Mgiant = 0.38 ± 0.01 M⊙ for a distance of ≃ 3.7 kpc. The mass of the giant indicates that its envelope has been partially stripped. The giant companion on the lower red giant branch has a mass of Mcomp = 1.91 ± 0.03 M⊙ with Teff, comp ≃ 5000 K, Lcomp ≃ 60 L⊙, and Rcomp ≃ 11 R⊙. The lower giant contributes |
Keywords | (stars:) binaries: spectroscopic; stars: individual 2MASS J04123153+6738486 |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Ohio State University, United States |
Center for Astrophysics Harvard and Smithsonian, United States | |
Harvard University, United States | |
Max Planck Institute for Astronomy, Germany | |
University of Hawaii, United States | |
Centre for Astrophysics | |
University of California Berkeley, United States | |
University of Florida, United States | |
University of Melbourne | |
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
University of California, United States | |
Leibniz Institute for Astrophysics, Germany | |
California Institute of Technology (Caltech), United States | |
University of Pittsburgh, United States |
https://research.usq.edu.au/item/z0225/the-giraffe-discovery-of-a-stripped-red-giant-in-an-interacting-binary-with-an-2-m-lower-giant
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