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The VLT-FLAMES survey of massive stars. NGC2004#115: A triple system hosting a possible short period B+BH binary by Lennon, D. J.; Dufton, P. L.; Villaseñor, J. I.; Evans, C. J.; Langer, N.; Saxton, R.; Monageng, I. M.; Toonen, S. is a scholarly article available to read on EtoBox.

What is The VLT-FLAMES survey of massive stars. NGC2004#115: A triple system hosting a possible short period B+BH binary about?

The star NGC2004#115 in the LMC, originally classified as an (SB1) Be spectroscopic binary, bears some morphological resemblance to the Galactic systems LB-1 and HR 6819, both of which are proposed as either Be+black hole (BH) or Be+stripped He-star systems. Two data-sets (ESO/VLT and SALT) of multi-epoch optical spectra of NGC 2004#115, separated by baseline of $\sim$20 years, lead us conclude it is a triple system hosting an inner binary with a period of 2.92 d, eccentricity $\sim$0.0 and mass function $\sim$0.07 $M_\odot$. The inner binary harbours a B-type star (the primary) with projected rotational velocity of 10km/s, and luminosity $\log L/L_\odot$=3.87, contributing $\sim$60% of the V-band light to the system. The secondary is not detected, while the tertiary, which contributes 40% of the light, is tentatively identified as a less luminous B-type star with high projected rotational velocity. No ellipsoidal light variability is detected, with stringent limits being set by MACHO and Gaia data. Assuming the primary to be a main sequence star yields a mass of 8.6$ M_\odot$, while the additional assumption of synchronous rotation constrains the inclination to be almost pole-on w

Author

Lennon, D. J.; Dufton, P. L.; Villaseñor, J. I.; Evans, C. J.; Langer, N.; Saxton, R.; Monageng, I. M.; Toonen, S.

Published

2021

Language

EN