The M Supergiant High-mass X-Ray Binary 4U 1954+31

被引：23
作者：
Hinkle, Kenneth H. [1 ]
Lebzelter, Thomas [2 ]
Fekel, Francis C. [3 ]
Straniero, Oscar [4 ,5 ]
Joyce, Richard R. [1 ]
Prato, Lisa [6 ]
Karnath, Nicole [7 ]
Habel, Nolan [8 ]
机构：
[1] NSFs Natl Opt Infrared Astron Res Lab, POB 26732, Tucson, AZ 85726 USA
[2] Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
[3] Tennessee State Univ, Ctr Excellence Informat Syst, 3500 John A Merritt Blvd,Box 9501, Nashville, TN 37209 USA
[4] INAF, Osservatorio Astron Abruzzo, I-64100 Teramo, Italy
[5] INFN, LNGS, Assergi, AQ, Italy
[6] Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA
[7] NASA Ames Res Ctr, USRA, SOFIA, MS 232-12, Moffett Field, CA 94035 USA
[8] Univ Toledo, Dept Phys & Astron, 2801 West Bancroft St, Toledo, OH 43606 USA
来源：
ASTROPHYSICAL JOURNAL | 2020年 / 904卷 / 02期
基金：
美国国家科学基金会;
关键词：
STARS; ATMOSPHERES; 4U-1700+24; EVOLUTION; ABUNDANCE; CATALOG; GIANTS; COOL;
D O I：
10.3847/1538-4357/abbe01
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The X-ray binary 4U 1954+31 has been classified as a low-mass X-ray binary containing an M giant and a neutron star (NS). It has also been included in the rare class of X-ray symbiotic binaries. The Gaia parallax, infrared colors, spectral type, abundances, and orbital properties of the M star demonstrate that the cool star in this system is not a low-mass giant but a high-mass M supergiant. Thus, 4U 1954+31 is a high-mass X-ray binary (HMXB) containing a late-type supergiant. It is the only known binary system of this type. The mass of the M I is 9(-2)(+6) M-circle dot giving an age of this system in the range 12-50 Myr with the NS no more than 43 Myr old. The spin period of the NS is one of the longest known, 5 hr. The existence of M I plus NS binary systems is in accord with stellar evolution theory, with this system a more evolved member of the HMXB population.
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页数：11
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