Article (Scientific journals)
HR 10: a main-sequence binary with circumstellar envelopes around both components. Discovery and analysis
Montesinos, B.; Eiroa, C.; Lillo-Box, J. et al.
2019In Astronomy and Astrophysics, 629, p. 19
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Keywords :
binaries: general; circumstellar matter; stars: fundamental parameters; techniques: interferometric; techniques: spectroscopic; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] 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 β Pic-like phenomena, within the falling evaporating body scenario. <BR /> 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. <BR /> 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. <BR /> 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[SUB]B[/SUB]/M[SUB]A[/SUB] = 0.72-0.84. The stars are slightly off the main sequence, the binary being 530 Myr old. <P />Partially based on observations obtained with PIONIER/VLT (ESO, Paranal, Chile), FIES/NOT, HERMES/Mercator, HARPS-N/TNG and UES/WHT (La Palma, Spain), FEROS/2.2-m ESO-MPIA (La Silla, Chile), CS21/Harlan J. Smith Telescope (McDonald Observatory, US) and UHRF/3.6-m AAT (Anglo Australian Observatory), and archival data from HARPS/3.6-m ESO and UVES/VLT (ESO archive), and HIRES/Keck 1 (Keck archive).
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Montesinos, B.;  Departmento de Astrofísica, Centro de Astrobiología (CAB, CSIC-INTA), ESAC Campus, Camino Bajo del Castillo s/n, 28692, Villanueva de la Cañada, Madrid, Spain
Eiroa, C.;  Departamento Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain ; Observatorio Astrónomico de Calar Alto, CAHA, 04550, Gérgal, Almería, Spain
Lillo-Box, J.;  European Southern Observatory (ESO), Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile ; Departmento de Astrofísica, Centro de Astrobiología (CAB, CSIC-INTA), ESAC Campus, Camino Bajo del Castillo s/n, 28692, Villanueva de la Cañada, Madrid, Spain
Rebollido, I.;  Departamento Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain
Djupvik, A. A.;  Nordic Optical Telescope, Apartado 474, 38700, Santa Cruz de La Palma, Santa Cruz de Tenerife, Spain
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Ertel, S.;  Large Binocular Telescope Observatory, 933 North Cherry Avenue, Tucson, AZ, 85721, USA ; Steward Observatory, Department of Astronomy, University of Arizona, 993 N. Cherry Avenue, Tucson, AZ, 85721, USA
Marion, L.;  Space sciences, Technologies, and Astrophysics Research (STAR) Institute, University of Liège, Belgium
Kajava, J. J. E.;  Finnish Centre for Astronomy with ESO (FINCA), University of Turku, 20014, Finland
Redfield, S.;  Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT, 06459, USA
Isaacson, H.;  Department of Astronomy, University of California, Berkeley, CA, USA
Cánovas, H.;  ESA-ESAC, Operations Department, Camino Bajo del Castillo s/n, 28692, Villanueva de la Cañada, Madrid, Spain
Meeus, G.;  Departamento Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain
Mendigutía, I.;  Departmento de Astrofísica, Centro de Astrobiología (CAB, CSIC-INTA), ESAC Campus, Camino Bajo del Castillo s/n, 28692, Villanueva de la Cañada, Madrid, Spain
Mora, A.;  Aurora Technology B.V. for ESA, ESA-ESAC, Camino Bajo del Castillo s/n, 28692, Villanueva de la Cañada, Madrid, Spain
Rivière-Marichalar, P.;  Observatorio Astronómico Nacional (OAN-IGN) - Observatorio de Madrid, Alfonso XII, 3, 28014, Madrid, Spain
Villaver, E.;  Departamento Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049, Madrid, Spain
Maldonado, J.;  INAF - Osservatorio Astronomico di Palermo Piazza del Parlamento 1, 90134, Palermo, Italy
Henning, T.;  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany)
More authors (9 more) Less
Language :
English
Title :
HR 10: a main-sequence binary with circumstellar envelopes around both components. Discovery and analysis
Publication date :
27 August 2019
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
629
Pages :
A19
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 February 2020

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