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26 April 2024 |
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The nearby eclipsing stellar system delta Velorum. II. First reliable orbit for the eclipsing pair | | T. Pribulla
; A. Merand
; P. Kervella
; M. Vaňko
; I.R. Stevens
; R. Chini
; V. Hoffmeister
; O. Stahl
; A. Berndt
; M. Mugrauer
; M. Ammler-von Eiff
; | | Date: |
29 Dec 2010 | | Abstract: | Context. The nearby multiple system delta Velorum contains a widely detached
eclipsing binary and a third component.
Aims. The system offers an opportunity to determine the set of fundamental
parameters (masses, luminosities, and radii) of three coeval stars with
sufficient precision to test models of stellar evolution.
Methods. Extensive high-resolution spectroscopy is analyzed by the broadening
function technique to provide the first spectroscopic orbit for the eclipsing
pair. Simultaneous analysis of the spectroscopic data and the SMEI satellite
light curve is performed to provide astrophysical parameters for the
components. Modified Roche model assuming eccentric orbit and asynchronous
rotation is used.
Results. The observations show that components of the eclipsing pair rotate
at about 2/3 of the break-up velocity which prevents any chemical peculiarity
and results in non-uniform surface brightness. Although the inner orbit is
eccentric, no apsidal motion is seen during the SMEI photometric observations.
The orbital parameters for the inner orbit are as follows: eccentricity e =
0.290, longitude of the periastron passage omega = 109 degrees, inclination
89.0 degrees.
Conclusions. Component’s masses MAa = 2.53pm0.11 Msun, MAb = 2.37pm0.10
Msun and MB = 1.5 Msun combined with inferred radii of Aa and Ab components
indicate that the eclipsing pair has already left the Main sequence and the
estimated age of the system is about 400 Myr. | | Source: | arXiv, 1012.5886 | | Services: | Forum | Review | PDF | Favorites | |
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