SIMBAD references

2016MNRAS.457.3372M - Mon. Not. R. Astron. Soc., 457, 3372-3383 (2016/April-2)

Physical parameters and long-term photometric variability of V1481 Ori, an SB2 member of Orion nebula Cluster with an accreting component.


Abstract (from CDS):

We present the results of our analysis on V1481 Ori (JW 239), a young SB2 in the Orion nebula Cluster with a circumbinary disc accreting on the lower mass component. The analysis is based on high-resolution spectroscopic data and high-quality photometric time series about 20-yr long. Thanks to the spectroscopy, we confirm the binary nature of this system consisting of M3 + M4 components and derive the mass ratio MB/MA=0.54, a variable luminosity ratio LB/LA=0.68-0.94, and an orbital period Porb=4.433 d. The photometric data allowed us to measure the rotation periods of the two components Pphot=4.4351 d and they are found to be synchronized with the orbital period. The simultaneous modelling of V-, I-band, and radial velocity curves in the 2005 season suggests that the variability is dominated by one hotspot on the secondary component covering at least ∼3.5 per cent of the stellar surface and about 420 K hotter than the unperturbed photosphere. Such a spot may originate from the material of the circumbinary disc accreting on to the secondary component. We also detect an apparent 6-yr periodic variation in the position of this hotspot, which is inferred from the phase migration of the light-curve maximum, which we interpret as due to either the presence of surface differential rotation as large as 0.065 per cent, a value compatible with the fully convective components, or to a periodic exchange of angular momentum between the disc and the star, which implies a minimum magnetic field strength of 650 G at the stellar surface.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): binaries: spectroscopic - circumstellar matter - stars: individual: V1481 Ori - stars: late-type - stars: low-mass - stars: pre-main-sequence

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 5

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