Towards a consistent model of the hot quadruple system HD 93206=QZ Carin ae II. N-body model
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10455225" target="_blank" >RIV/00216208:11320/22:10455225 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uKfFhQ5xQO" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=uKfFhQ5xQO</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202243596" target="_blank" >10.1051/0004-6361/202243596</a>
Alternative languages
Result language
angličtina
Original language name
Towards a consistent model of the hot quadruple system HD 93206=QZ Carin ae II. N-body model
Original language description
Aims. HD 93206 is a massive early-type stellar system composed of components resolved by direct imaging (Ab, Ad, B, C, D) and a compact subsystem (Aa1, Aa2, Ac1, Ac2). Its geometry was already determined on the basis of extensive photometric, spectroscopic, and interferometric observations. However, the fundamental absolute parameters are still not known precisely enough. Methods. We use an advanced N-body model to account for all mutual gravitational perturbations among the four close components, and all observational data types, including astrometry, radial velocities, eclipse timing variations, squared visibilities, closure phases, triple products, normalized spectra, and spectral energy distribution (SED). The model has 38 free parameters, grouped into three sets of orbital elements, component masses, and their basic radiative properties (T, log g, v(rot)). Results. We revised the fundamental parameters of QZ Car as follows. For a model with the nominal extinction coefficient R-V equivalent to A(V)/E(B - V) = 3.1, the best-fit masses are m(1)=26.1M(S), m(2)=32.3M(S), m(3)=70.3M(S), and m(4)=8.8M(S), with uncertainties of the order of 2M(S), and the system distance d=(2800 +/- 100)pc. In an alternative model, where we increased the weights of the radial velocity (RV) and transit timing variation (VTT) observations and relaxed the SED constraints, because extinction can be anomalous with R-V similar to 3.4, the distance is smaller: d=(2450 +/- 100)pc. This corresponds to the distance of the Collinder 228 cluster. Independently, this is confirmed by dereddening the SED, which is only then consistent with the early-type classification (O9.7Ib for Aa1, O8III for Ac1). Future modelling should also account for an accretion disk around the Ac2 component.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA19-01995S" target="_blank" >GA19-01995S: Studying long-term variability and duplicity of individual classical as well as other Be stars with multi-technique observations</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
666
Issue of the periodical within the volume
říjen
Country of publishing house
FR - FRANCE
Number of pages
12
Pages from-to
A24
UT code for WoS article
000862062400016
EID of the result in the Scopus database
2-s2.0-85141444400