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Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560

Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560
Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560
In symbiotic binaries, jets and disk winds may be integral to the physics of accretion onto white dwarfs from cool giants. The persistent outflow from symbiotic star MWC 560 (=V694 Mon) is known to manifest as low-ionization broad absorption lines (BALs), most prominently at the Balmer transitions, and as high-ionization BALs from metastable He I*. We report the detection of higher-ionization BALs from C IV, Si IV, N V, and He II in International Ultraviolet Explorer spectra obtained on 1990 April 29-30, when an optical outburst temporarily erased the obscuring 'iron curtain' of absorption troughs from Fe II and similar ions. The C IV and Si IV BALs reached maximum radial velocities at least 1000 km/s faster than contemporaneous Mg II and He II BALs; the same behaviors occur in the winds of quasars and cataclysmic variables. An iron curtain lifts to unveil high-ionization BALs during the P Cygni phase observed in some novae, suggesting by analogy a temporary switch in MWC 560 from persistent outflow to discrete mass ejection. At least three more symbiotic stars exhibit broad absorption with blue edges faster than 1500 km/s; exclusively high-ionization BALs have been reported in AS 304 (=V4018 Sgr), while instead transient Balmer BALs have been reported in Z And and CH Cyg. These BAL-producing fast outflows can have wider opening angles than has been previously supposed. BAL symbiotics are short-timescale laboratories for their giga-scale analogs, broad absorption line quasars (BALQSOs), which display a similarly wide range of ionization states in their winds.
astro-ph.HE, astro-ph.GA, astro-ph.SR
0035-8711
Lucy, Adrian B.
cd5af950-3219-4fea-bae0-0f81f2a654f2
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Sokoloski, J. L.
72abfb37-621a-41f2-b04c-fc210acf13fe
Lucy, Adrian B.
cd5af950-3219-4fea-bae0-0f81f2a654f2
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Sokoloski, J. L.
72abfb37-621a-41f2-b04c-fc210acf13fe

Lucy, Adrian B., Knigge, Christian and Sokoloski, J. L. (2018) Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560. Monthly Notices of the Royal Astronomical Society.

Record type: Article

Abstract

In symbiotic binaries, jets and disk winds may be integral to the physics of accretion onto white dwarfs from cool giants. The persistent outflow from symbiotic star MWC 560 (=V694 Mon) is known to manifest as low-ionization broad absorption lines (BALs), most prominently at the Balmer transitions, and as high-ionization BALs from metastable He I*. We report the detection of higher-ionization BALs from C IV, Si IV, N V, and He II in International Ultraviolet Explorer spectra obtained on 1990 April 29-30, when an optical outburst temporarily erased the obscuring 'iron curtain' of absorption troughs from Fe II and similar ions. The C IV and Si IV BALs reached maximum radial velocities at least 1000 km/s faster than contemporaneous Mg II and He II BALs; the same behaviors occur in the winds of quasars and cataclysmic variables. An iron curtain lifts to unveil high-ionization BALs during the P Cygni phase observed in some novae, suggesting by analogy a temporary switch in MWC 560 from persistent outflow to discrete mass ejection. At least three more symbiotic stars exhibit broad absorption with blue edges faster than 1500 km/s; exclusively high-ionization BALs have been reported in AS 304 (=V4018 Sgr), while instead transient Balmer BALs have been reported in Z And and CH Cyg. These BAL-producing fast outflows can have wider opening angles than has been previously supposed. BAL symbiotics are short-timescale laboratories for their giga-scale analogs, broad absorption line quasars (BALQSOs), which display a similarly wide range of ionization states in their winds.

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1802.07743v1 - Accepted Manuscript
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More information

Accepted/In Press date: 11 April 2018
e-pub ahead of print date: 14 April 2018
Additional Information: submitted to MNRAS; comments welcome; 8 pages, 3 figures, 2 tables, centered on A4 paper [for most 8.5x11 printers, set scaling to None/100% and leave auto-centering on]
Keywords: astro-ph.HE, astro-ph.GA, astro-ph.SR

Identifiers

Local EPrints ID: 418807
URI: http://eprints.soton.ac.uk/id/eprint/418807
ISSN: 0035-8711
PURE UUID: d067b382-b800-4188-86fa-6d78340082c1

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Date deposited: 22 Mar 2018 17:30
Last modified: 19 Jul 2019 17:25

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