Spectrum of the secondary component and new orbital elements of the massive triple star delta Ori A

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00572124" target="_blank" >RIV/67985815:_____/23:00572124 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/23:10468994

Result on the web

<a href="https://hdl.handle.net/11104/0342979" target="_blank" >https://hdl.handle.net/11104/0342979</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202245272" target="_blank" >10.1051/0004-6361/202245272</a>

Result language

angličtina

Original language name

Spectrum of the secondary component and new orbital elements of the massive triple star delta Ori A

Original language description

Delta Orionis is the closest massive multiple stellar system and one of the brightest members of the Orion OB association. The primary (Aa1) is a unique evolved O star. In this work, we applied a two-step disentangling method to a series of spectra in the blue region (430-450 nm), and we detected spectral lines of the secondary (Aa2). For the first time, we were able to constrain the orbit of the tertiary (Ab) to 55 450 d or 152 yr using variable gamma velocities and new speckle interferometric measurements, which have been published in the Washington Double Star Catalogue. In addition, the Gaia DR3 parallax of the faint component (Ca+Cb) constrains the distance of the system to (381 +/- 8) pc, which is just in the centre of the Orion OB1b association, at (382 +/- 1) pc. Consequently, we found that the component masses according to the three-body model are 17.8, 8.5, and 8.7 M-circle dot, for Aa1, Aa2, and Ab, respectively, with the uncertainties of the order of 1 M-circle dot. We used new photometry from the BRITE satellites together with astrometry, radial velocities, eclipse timings, eclipse duration, spectral line profiles, and spectral energy distribution to refine radiative properties. The components, classified as O9.5 II + B2 V + B0 IV, have radii of 13.1, 4.1, and 12.0 R-circle dot, which means that delta Ori A is a pre-mass-transfer object. The frequency of 0.478 cycles per day, known from the Fourier analysis of the residual light curve and X-ray observations, was identified as the rotation frequency of the tertiary. delta Ori could be related to other bright stars in Orion, in particular, zeta Ori, which has a similar architecture, or epsilon Ori, which is a single supergiant, and possibly a post-mass-transfer object.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

672

Issue of the periodical within the volume

April

Country of publishing house

FR - FRANCE

Number of pages

22

Pages from-to

A31

UT code for WoS article

000962574600008

EID of the result in the Scopus database

2-s2.0-85151158777