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Evidence for conservative mass transfer in the classical Algol system d Librae from its surface carbon-to-nitrogen abundance ratio

Dervişoğlu, A; Pavlovski, K; Lehmann, H; Southworth, J; Bewsher, D

Evidence for conservative mass transfer in the classical Algol system d Librae from its surface carbon-to-nitrogen abundance ratio Thumbnail


Authors

A Dervişoğlu

K Pavlovski

H Lehmann

D Bewsher



Abstract

Algol-type binary systems are the product of rapid mass transfer between the initially more massive component to its companion. It is still unknown whether the process is conservative, or whether substantial mass is lost from the system. The history of a system prior to mass exchange is imprinted in the photospheric chemical composition, in particular in the carbon-to-nitrogen (C/N) ratio. We use this to trace the efficiency of mass-transfer processes in the components of a classical Algol-type system, d Librae. The present analysis is based on new spectroscopic data (ground-based high-resolution échelle spectra) and extracted archival photometric observations (space-based measurements from the STEREO satellites). In the orbital solution, non-Keplerian effects on the radial-velocity variations were taken into account. This reduces the primary’s mass by 1.1 M ? (~23 per?cent) significantly in comparison to previous studies, and removes a long-standing discrepancy between the radius and effective temperature. A spectral disentangling technique is applied to the échelle observations and the spectra of the individual components are separated. Atmospheric and abundance analyses are performed for the mass-gaining component and we found C/N =1.55 ± 0.40 for this star. An extensive set of evolutionary models (3.5 × 106) for both components are calculated from which the best-fitting model is derived. It is found that ß, the parameter that quantifies the efficiency of mass-loss from a binary system, is close to zero. This means that the mass transfer in d Lib is mostly conservative with little mass-loss from the system.

Journal Article Type Article
Acceptance Date Sep 28, 2018
Online Publication Date Oct 3, 2018
Publication Date 2018-12
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 481
Issue 4
Pages 5660 -5674
DOI https://doi.org/10.1093/mnras/sty2684
Keywords stars, abundances, binaries, eclipsing, spectroscopic, evolution
Publisher URL http://dx.doi.org/10.1093/mnras/sty2684

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