2019MNRAS.483.2814D

Query : 2019MNRAS.483.2814D

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.

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

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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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 108 SB* 00 06 03.3890541936 +63 40 46.771220928 6.79 7.58 7.40     O4-8f?p 338 0
2 NGC 1624 OpC 04 40 36.0 +50 27 42     11.8     ~ 79 1
3 NGC 1624 2 * 04 40 37.2758720568 +50 27 41.040508572 11.9 12.47 11.57     O7f?cp 62 0
4 * lam Ori A Em* 05 35 08.2760807112 +09 56 02.991326316 2.17 3.48 3.47     O8III((f)) 527 0
5 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
6 HD 54879 SB* 07 10 08.1487629504 -11 48 09.838940004 6.8 7.60 7.65     O9.7V 98 0
7 HD 57682 * 07 22 02.0546074728 -08 58 45.766323408 5.20 6.24 6.43     O9.2IV 275 0
8 CD-28 5104 s*b 07 55 52.8512069760 -28 37 46.791254424 9.39 10.13 9.94 10.12   O6Ifp 93 0
9 HD 93146B * 10 43 59.4513715488 -60 05 13.424726256 9.07         O9.7IV 23 0
10 HD 93146 ** 10 44 00.13416 -60 05 08.7396           O6V+O9.5V 88 0
11 HD 93146A * 10 44 00.1579435416 -60 05 09.880180368 7.57 8.45 8.47 9.281   O7V((f))z 91 0
12 HD 148937 SB* 16 33 52.3869185520 -48 06 40.476418740 6.49 7.12 6.71 7.61   O6f?p 417 1
13 HD 191612 SB* 20 09 28.6105997664 +35 44 01.286453904 7.40 8.07 7.80     O8fpe 250 0

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