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• W3217367323 endingPage "A180" @default.
• W3217367323 startingPage "A180" @default.
• W3217367323 abstract "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 with i~9 degrees, implying the secondary is a BH with a mass of $sim$25 $M_odot$. A low mass stripped star with similar luminosity is ruled out as a potential solution as its mass implies a Roche radius that is substantially smaller than the stellar radius. The outer period likely exceeds 120 days and, while the disk-like emission is variable (it is almost absent in the SALT dataset), it may be associated with the inner binary rather than the rapidly rotating tertiary. XMM-Newton provides an upper limit of 5x$10^{33}$ ergs/s on the X-ray flux, consistent with, though not constraining of, the system hosting a quiescent B+BH binary. A number of caveats to this scenario are discussed in the paper." @default.
• W3217367323 created "2021-12-06" @default.
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• W3217367323 date "2022-09-01" @default.
• W3217367323 modified "2023-10-17" @default.
• W3217367323 title "The VLT-FLAMES survey of massive stars" @default.
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• W3217367323 doi "https://doi.org/10.1051/0004-6361/202142413" @default.
• W3217367323 hasPublicationYear "2022" @default.
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