2021ApJ...920..142H

Query : 2021ApJ...920..142H

2021ApJ...920..142H - Astrophys. J., 920, 142-142 (2021/October-3)

Chandra/LETGS studies of the collisional plasma in 4U 1626-67.

HEMPHILL P.B., SCHULZ N.S., MARSHALL H.L. and CHAKRABARTY D.

Abstract (from CDS):

We present an analysis of Chandra/LETGS observations of the ultracompact X-ray binary (UCXB)4U 1626-67, continuing our project to analyze the existing Chandra gratings data of this interesting source. The extremely-low-mass, hydrogen-depleted donor star provides a unique opportunity to study the properties and structure of the metal-rich accreted plasma. There are strong, double-peaked emission features of O VII-VIII and Ne IX-X, but no other identified emission lines are detected. Our spectral fit simultaneously models the emission-line profiles and the plasma parameters, using a two-temperature collisionally-ionized plasma. Based on our line-profile fitting, we constrain the inclination of the system to 25-60° and the inner disk radius to ∼1500 gravitational radii, in turn constraining the donor mass to <=0.026 M_☉, while our plasma modeling confirms previous reports of high neon abundance in the source, establishing a Ne/O ratio in the system of 0.47 ± 0.04, while simultaneously estimating a very low Fe/O ratio of 0.0042 ± 0.0008 and limiting the Mg/O ratio to less than 1% by number. We discuss these results in light of previous work.

Journal keyword(s): Neutron stars - Stellar accretion disks - Low-mass x-ray binary stars - High resolution spectroscopy - Pulsars - Compact binary stars - Plasma astrophysics - White dwarf stars

Simbad objects: 1

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Number of rows : 1

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* KZ TrA	LXB	16 32 16.79	-67 27 39.3	17.40	18.60	18.5			~	626	1

Query : 2021ApJ...920..142H

Basic data :

V* KZ TrA -- Low Mass X-ray Binary

X (2022MNRAS,4U,...), LXB (2013ApJS), Psr (2007ApJS,PSR), gam (INTEGRAL1,INTREF), N* (2014MNRAS), V* (V*)

16 32 16.79 -67 27 39.3 (X-ray) [ 700 700 90 ] C 2012ApJ...756...27L

16 27 14.69 -67 21 14.6 [ 700 700 90 ]

321.78837 -13.09171 [ 700 700 90 ]

U 17.40 [~] D 2007A&A...469..807L

B 18.60 [~] D 2007A&A...469..807L

V 18.5 [~] D 2007A&A...469..807L

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`4U 1626-67`	`INTEGRAL1 26`	`1RXS J163217.0-672743`	`3U 1626-67`
`2A 1627-673`	`INTREF 700`	`2S 1627-673`	`4U 1626-673`
`3A 1627-674`	`1M 1626-673`	`SRGA J163217.0-672738`	*`V KZ TrA`**
`1H 1627-673`	`2MAXI J1632-674`	`SWIFT J1632.4-6729`	`2XMM J163216.7-672739`
`H 1616-67`	`PBC J1632.2-6727`	`SWIFT J1632.3-6725`	`[BM83] X1627-673`
`H 1627-673`	`PSR B1627-67.3`	`2U 1626-67`	`[KRL2007b] 191`

References (626 between 1850 and 2026) (Total 626)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* KZ TrA

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1RXS J163217.0-672743 V* KZ TrA

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