SIMBAD references

2019MNRAS.483.2814D - Mon. Not. R. Astron. Soc., 483, 2814-2824 (2019/February-3)

Extreme resonance line profile variations in the ultraviolet spectra of NGC 1624-2: probing the giant magnetosphere of the most strongly magnetized known O-type star.

DAVID-URAZ A., ERBA C., PETIT V., FULLERTON A.W., MARTINS F., WALBORN N.R., MacINNIS R., BARBA R.H., COHEN D.H., MAIZ-APELLANIZ J., NAZE Y., OWOCKI S.P., SUNDQVIST J.O., UD-DOULA A. and WADE G.A.

Abstract (from CDS):

In this paper, we present high-resolution HST/COS observations of the extreme magnetic O star NGC 1624-2. These represent the first ultraviolet spectra of this archetypal object. We examine the variability of its wind-sensitive resonance lines, comparing it to that of other known magnetic O stars. In particular, the observed variations in the profiles of the C IV and Si IV doublets between low state and high state are the largest observed in any magnetic O-type star, consistent with the expected properties of NGC 1624-2's magnetosphere. We also observe a redshifted absorption component in the low state, a feature not seen in most stars. We present preliminary modelling efforts based on the Analytic Dynamical Magnetosphere (ADM) formalism, demonstrating the necessity of using non-spherically symmetric models to determine wind/magnetospheric properties of magnetic O stars.

Journal keyword(s): stars: early-type - stars: individual: NGC 1624-2 - stars: magnetic field - stars: winds, outflows - ultraviolet: stars

Simbad objects: 13

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