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HR 10: a main-sequence binary with circumstellar envelopes around both components
Author
Montesinos, B.Eiroa, C.
Lillo-Box, J.
Rebollido, I.
Djupvik, A. A.
Absil, O.
Ertel, S.
Marion, L.
Kajava, J. J. E.
Redfield, S.
Isaacson, H.
Cánovas, H.
Meeus, G.
Mendigutía, I.
Mora, A.
Rivière-Marichalar, P.
Villaver, E.
Maldonado, J.
Henning, T.
Affiliation
Univ Arizona, Dept Astron, Steward ObservIssue Date
2019-08-27Keywords
binaries: generalcircumstellar matter
stars: fundamental parameters
techniques: interferometric
techniques: spectroscopic
Metadata
Show full item recordPublisher
EDP SCIENCES S ACitation
B. Montesinos, C. Eiroa, J. Lillo-Box, I. Rebollido, A. A. Djupvik, O. Absil, S. Ertel, L. Marion, J. J. E. Kajava, S. Redfield, H. Isaacson, H. Cánovas, G. Meeus, I. Mendigutía, A. Mora, P. Rivière-Marichalar, E. Villaver, J. Maldonado and T. Henning A&A, 629 (2019) A19 DOI: https://doi.org/10.1051/0004-6361/201936180Journal
ASTRONOMY & ASTROPHYSICSRights
Copyright © ESO 2019.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Context. This paper is framed within a large project devoted to studying the presence of circumstellar material around main sequence stars, and looking for exocometary events. The work concentrates on HR 10 (A2 IV/V), known for its conspicuous variability in the circumstellar narrow absorption features of Ca II K and other lines, so far interpreted as beta Pic-like phenomena, within the falling evaporating body scenario. Aims. The main goal of this paper is to carry out a thorough study of HR 10 to find the origin of the observed variability, determine the nature of the star, its absolute parameters, and evolutionary status. Methods. Interferometric near-infrared (NIR) observations, multi-epoch high-resolution optical spectra spanning a time baseline of more than 32 yr, and optical and NIR photometry, together with theoretical modelling, were used to tackle the above objectives. Results. Our results reveal that HR 10 is a binary. The narrow circumstellar absorption features superimposed on the photospheric Ca II K lines - and lines of other species - can be decomposed into two or more components, the two deep ones tracing the radial velocity of the individual stars, which implies that their origin cannot be ascribed to transient exocometary events, their variability being fully explained by the binarity of the object. There does not appear to be transient events associated with potential exocomets. Each individual star holds its own circumstellar shell and there are no traces of a circumbinary envelope. Finally, the combined use of the interferometric and radial velocity data leads to a complete spectrometric and orbital solution for the binary, the main parameters being: an orbital period of 747.6 days, eccentricities of the orbits around the centre of mass 0.25 (HR 10-A), 0.21 (HR 10-B) and a mass ratio of q = M-B/M-A = 0.72-0.84. The stars are slightly off the main sequence, the binary being similar to 530 Myr old.ISSN
1432-0746Version
Final published versionSponsors
ESA Research Fellowship Programme; Academy of Finland [295114]; Talento Fellowship (Government of Comunidad Autonoma de Madrid, Spain [2016-T1/TIC-1890]; ESO programmes [093.C-0712(B), 099. C-2015(A), 0101.C-0182(B)]; ESO Science Archive Facility [079.C-0789, 094.C-0946]; National Aeronautics and Space Administration;[AYA 2014-55840-P]ae974a485f413a2113503eed53cd6c53
10.1051/0004-6361/201936180