000006161 001__ 6161
000006161 005__ 20230123211742.0
000006161 0247_ $$2DOI$$a10.1093/mnras/stac1762
000006161 037__ $$aSCART-2023-0086
000006161 100__ $$aChené, André-Nicolas
000006161 245__ $$aWR 63: a multiple system (O+O) + WR?
000006161 260__ $$c2022
000006161 520__ $$aThe spectrum of the Wolf-Rayet (WR) star WR 63 contains spectral lines of two different O stars that show regular radial velocity (RV) variations with amplitudes of ~160 and ~225 km s-1 on a ~4.03 d period. The light curve shows two narrow eclipses that are 0.2 mag deep on the same period as the RV changes. On the other hand, our data show no significant RV variations for the WR spectral lines. Those findings are compatible with WR 63 being a triple system composed of two non-interacting late-O stars orbiting a WR star on a period longer than 1000 d. The amplitude of the WR spectral line-profile variability reaches 7-8 per cent of the line intensity and seems related to a 0.04 mag periodic photometric variation. Large wind density structures are a possible origin for this variability, but our data are not sufficient to verify this. Our analysis shows that, should the three stars be bound, they would be coeval with an age of about 5.9 ± 1.4 Myr. The distance to the O stars is estimated to be  3.4±0.5 kpc. Their dynamical masses are 14.3 ± 0.1 and 10.3 ± 0.1 M⊙. Using rotating single-star evolutionary tracks, we estimate their initial masses to be 18 ± 2 and 16 ± 2 M⊙ for the primary and the secondary, respectively. Regular spectral monitoring is required in the future to detect RV variations of the WR star that would prove that it is gravitationally bound to the close O+OB system and to determine its mass.
000006161 594__ $$aNO
000006161 6531_ $$abinaries: eclipsing
000006161 6531_ $$abinaries: spectroscopic
000006161 6531_ $$astars: individual: WR 63
000006161 6531_ $$astars: winds
000006161 6531_ $$aoutflows
000006161 6531_ $$astars: Wolf-Rayet
000006161 6531_ $$aAstrophysics - Solar and Stellar Astrophysics
000006161 700__ $$aMahy, Laurent
000006161 700__ $$aGosset, Eric
000006161 700__ $$aSt-Louis, Nicole
000006161 700__ $$aDsilva, Karan
000006161 700__ $$aManick, Rajeev
000006161 773__ $$c1022-1031$$n1$$pMonthly Notices of the Royal Astronomical Society$$v516$$y2022
000006161 8560_ $$flaurent.mahy@ksb-orb.be
000006161 8564_ $$s2968951$$uhttp://publi2-as.oma.be/record/6161/files/Chene_2022_stac1762.pdf
000006161 8564_ $$s4268$$uhttp://publi2-as.oma.be/record/6161/files/Chene_2022_stac1762.gif?subformat=icon$$xicon
000006161 8564_ $$s8692$$uhttp://publi2-as.oma.be/record/6161/files/Chene_2022_stac1762.jpg?subformat=icon-180$$xicon-180
000006161 905__ $$apublished in
000006161 980__ $$aREFERD