2000ApJ...544L.123B

The discovery of broad P Cygni X-ray lines from Circinus X-1 with the Chandra high-energy transmission grating spectrometer.

We present the first grating-resolution X-ray spectra of the X-ray binary Circinus X-1, obtained with the High-Energy Transmission Grating Spectrometer on Chandra. These reveal a rich set of lines from H-like and/or He-like Ne, Mg, Si, S, and Fe detected with a high signal-to-noise ratio. The lines are broad (±2000 km.s^–1) and show P Cygni profiles. The absorption components of the lines extend to low velocity, and they have about the same widths and strengths as the corresponding emission components. The widths of the X-ray P Cygni lines are comparable to that of the broad component of the strong, asymmetric Hα line from Cir X-1, suggesting that the two phenomena may be related. We discuss outflow models and propose that the P Cygni profiles may arise in the moderate temperature (∼5x10⁶ K) region of the wind from an X-ray-heated accretion disk. This basic picture strengthens the idea that the accretion disk in Cir X-1 is viewed in a relatively edge-on manner, and it suggests that Cir X-1 is the X-ray binary analog of a broad absorption line quasar.

Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: Close - Stars: Individual: Constellation Name: Circinus X-1 - Stars: Neutron - Techniques: Spectroscopic - X-Rays: Stars

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	V* BR Cir	HXB	15 20 40.8532547060	-57 10 00.206639033		21.4	21.4			B5-A0I	849	1

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`X Cir X-1`	`INTEGRAL1 14`	`SSTGLMC G322.1185+00.0378`	`4U 1516-56`
`3A 1516-569`	`INTREF 645`	`SWIFT J1521.0-5711`	*`V BR Cir`**
`2CXO J152040.8-571000`	`1M 1516-569`	`SWIFT J1520.6-5710`	`XB 1516-569`
`GPS 1517-570`	`2MASS J15204084-5710001`	`2SXPS J152040.6-571002`	`4XMM J152040.8-571000`
`GRS G322.50 +00.10`	`PBC J1520.6-5710`	`TIC 45754445`	`1XRS 15168-569`
`1H 1516-569`	`1RXS J152040.8-571007`	`2U 1516-56`	`[BM83] X1516-569`
`H 1510-56`	`2S 1516-569`	`3U 1516-56`	`[KRL2007b] 168`
`H 1516-569`	`SRGA J152040.8-571002`	`4U 1516-569`	`Gaia DR3 5883218164517055488`