The clumpy absorber in the high-mass X-ray binary Vela X-1

V. Grinberg; N. Hell; I. El Mellah; J. Neilsen; A. A. C. Sander; M. Leutenegger; F. Fürst; D. P. Huenemoerder; P. Kretschmar; M. Kühnel; S. Martínez-Núñez; S. Niu; K. Pottschmidt; N. S. Schulz; J. Wilms; M. A. Nowak

doi:10.1051/0004-6361/201731843

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Volume 608 (December 2017)

A&A, 608 (2017) A143

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Table 6

Magnesium absorption lines in the low-hardness spectrum.

			Individual lines			Line series
Ion	Line	Reference^a	Bayesian	v	Equivalent	v	Equivalent
		wavelength	Blocks α_sig		width		width
		[Å]		[ km s^-1]	[ 10^-3 Å]	[ km s^-1]	[ 10^-3 Å]

He-like	Mg xi r	9.170	≥7	−480 ± 60	−6.9 ± 1.5	−360 ± 60	−12.0 ± 1.7
Li-like	Mg x Kα	9.282	≥4.6		−3.0 ± 1.5	= v _{Mg xir}	−0.7 ± 2.0
Be-lie	Mg ix Kα	9.378	no^b		−4.1 ± 1.6	= v _{Mg xir}	−3.6 ± 1.6
B-like	Mg viii Kα	9.619	no^b	...	...	= v _{Mg xir}	−1.2 ± 1.8
C-like	Mg vii Kα	9.506	no^b	...	...	= v _{Mg xir}	−2.6 ± 1.9
N-like	Mg vi Kα	9.718	2	−330 ± 90	−6.0 ± 1.8	= v _{Mg xir}	−5.9 ± 1.7
O-like	Mg v Kα	9.816	2	−640 ± 90	−5.3 ± 1.8	= v _{Mg xir}
F-like	Mg iv Kα	9.895	no^b	...	...	= v _{Mg xir}	−0.9 ± 1.8

Notes.

^(a)

All from Behar & Netzer (2002); values for B-like Mg viii Kα and C-like Mg vii Kα averages over the two strong transitions listed.

^(b)

We run line searches for α ≥ 1.5.

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