SIMBAD references

2019MNRAS.482.4408G - Mon. Not. R. Astron. Soc., 482, 4408-4421 (2019/February-1)

CPD-64°2731: a massive spun-up and rejuvenated high-velocity runaway star.

GVARAMADZE V.V., MARYEVA O.V., KNIAZEV A.Y., ALEXASHOV D.B., CASTRO N., LANGER N. and KATKOV I.Y.

Abstract (from CDS):

We report the results of our study of the high-velocity (~160 km s–1) runaway O star CPD-64°2731 and its associated horseshoe-shaped nebula discovered with the Wide-field Infrared Survey Explorer. Spectroscopic observations with the Southern African Large Telescope and spectral analysis indicate that CPD-64°2731 is a fast-rotating main-sequence O5.5 star with enhanced surface nitrogen abundance. We derive a projected rotational velocity of ~300 km s–1 that is extremely high for this spectral type. Its kinematic age of ≃6 Myr, assuming it was born near the Galactic plane, exceeds its age derived from single star models by a factor of 2. These properties suggest that CPD-64°2731 is a rejuvenated and spun-up binary product. The geometry of the nebula and the almost central location of the star within it argue against a pure bow shock interpretation for the nebula. Instead, we suggest that the binary interaction happened recently, thereby creating the nebula, with a cavity blown by the current fast stellar wind. This inference is supported by our results of 2D numerical hydrodynamic modelling.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): blue stragglers - circumstellar matter - stars: individual: CPD-64deg2731 - stars: massive - stars: rotation

Simbad objects: 16

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2019.10.23-08:32:55

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