On Its Way to the Neutron Star-White Dwarf Binary Graveyard, IGR J16194-2810, A First Ascent M Giant X-Ray Binary

被引：4

作者：

Hinkle, Kenneth H. ^{[1
]}

Fekel, Francis C. ^{[2
]}

Straniero, Oscar ^{[3
,4
]}

Maas, Zachary G. ^{[5
]}

Joyce, Richard R. ^{[1
]}

Lebzelter, Thomas ^{[6
]}

Muterspaugh, Matthew W. ^{[7
]}

Sowell, James R. ^{[8
]}

机构：

[1] NSFs Natl Opt Infrared Astron Res Lab, POB 26732, Tucson, AZ 85726 USA

[2] Tennessee State Univ, Ctr Excellence Informat Syst, 3500 John A Merritt Blvd,Box 9501, Nashville, TN 37209 USA

[3] INAF, Osservatorio Astron Abruzzo, I-64100 Teramo, Italy

[4] INFN, Sez Roma Sapienza, Rome, Italy

[5] Indiana Univ, Astron Dept, 727 East 3rd St, Bloomington, IN 47405 USA

[6] Univ Vienna, Turkenschanzstr 17, A-1180 Vienna, Austria

[7] Columbia State Community Coll, Columbia, TN 39401 USA

[8] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 969卷 / 01期

基金：

美国国家科学基金会;

关键词：

LOW-MASS; INFRARED-SPECTROSCOPY; CORE-COLLAPSE; RED GIANTS; MILLISECOND PULSARS; SYMBIOTIC STARS; LIGHT CURVES; EVOLUTIONARY SEQUENCES; EFFECTIVE TEMPERATURES; CHEMICAL-COMPOSITION;

D O I：

10.3847/1538-4357/ad4641

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A single-lined spectroscopic orbit for the M giant in the X-ray binary IGR J16194-2810 is determined from a time series of optical spectra. The spectroscopic orbital period of 192.5 days is twice that of the photometric period, confirming that the M giant in the system is an ellipsoidal variable. The giant is identified as a first ascent giant approaching the red giant tip. The primary is a neutron star (NS) with its M giant companion filling its Roche lobe, verifying the system classification as a low-mass X-ray binary (LMXB). Stellar C, N, O, and Fe abundances are derived for the M giant with the C, N, and O values typical for a field giant with [Fe/H] = -0.14. The system does not have a large kick velocity. Models for the evolution of the system into a binary NS-white dwarf are presented. The X-ray properties are discussed in the context of this model. This binary is a rare example of a luminous, long orbital period LMXB early in the transient ellipsoidal phase.

引用

页数：22

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