BRITE observations of ν Centauri and γ Lupi, the first non-eclipsing members of the new class of nascent binaries

Author:

Jerzykiewicz M1,Pigulski A1,Michalska G1,Moździerski D1,Ratajczak M12ORCID,Handler G3,Moffat A F J4,Pablo H5ORCID,Popowicz A6,Wade G A7,Zwintz K8

Affiliation:

1. Astronomical Institute, University of Wrocław, Kopernika 11, PL-51-622 Wrocław, Poland

2. Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland

3. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warsaw, Poland

4. Centre de Recherche en Astrophysique du Québec, Dépt. de physique, Univ. de Montréal, C.P. 6128, Succ. C-V., Montréal, QC, H3C 3J7, Canada

5. American Association of Variable Star Observers, 49 Bay State Road, Cambridge, MA 02138, USA

6. Department of Electronics, Electrical Engineering and Microelectronics, Silesian University of Technology, Akademicka 16, PL-44-100 Gliwice, Poland

7. Department of Physics and Space Science, Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, ON K7K 0C6, Canada

8. Institut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria

Abstract

ABSTRACT Results of an analysis of the BRITE-Constellation and Solar Mass Ejection Imager photometry and radial-velocity observations, archival and new, of two single-lined spectroscopic binary (SB) systems ν Centauri and γ Lupi are reported. In the case of γ Lup AB, a visual binary, an examination of the light-time effect shows that component A is the SB. Both ν Cen and γ Lup exhibit light variations with the orbital period. The variations are caused by the reflection effect, i.e. heating of the secondary’s hemisphere by the early-B main sequence (MS) primary component’s light. The modelling of the light curves augmented with the fundamental parameters of the primary components obtained from the literature photometric data and Hipparcos parallaxes, shows that the secondary components are pre-MS stars, in the process of contracting on to the MS. ν Cen and γ Lup A are thus found to be non-eclipsing counterparts of the B2 IV eclipsing binary (and a β Cephei variable) 16 (EN) Lac, the B5 IV eclipsing binary (and an SPB variable) μ Eri, and the recently discovered Large Magellanic Cloud nascent eclipsing binaries.

Funder

NCN

NSERC

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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