Infrared spectroscopy of symbiotic stars. II. Orbits for five S-type systems with two-year periods

被引:70
作者
Fekel, FC
Hinkle, KH
Joyce, RR
Skrutskie, MF
机构
[1] Tennessee State Univ, Ctr Excellence Informat Syst, Nashville, TN 37203 USA
[2] Natl Opt Astron Observ, Kitt Peak Natl Observ, Tucson, AZ 85726 USA
[3] Univ Massachusetts, Dept Phys & Astron, Amherst, MA 01003 USA
关键词
binaries : symbiotic; infrared : stars; stars : individual (Z Andromedae; AG Draconis; V443; Herculis; AX Persei; FG Serpentis); stars : late-type;
D O I
10.1086/316872
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Infrared radial velocities have been used to determine orbital elements for the cool giants of five well-known symbiotic systems, Z And, AG Dra, V443 Her, AX Per, and FG Ser, all of which have orbital periods near the two-year mean period for S-type symbiotics. The new orbits are in general agreement with previous orbits derived from optical velocities. From the combined optical and infrared velocities, improved orbital elements for the five systems have been determined. Each of the orbital periods has been determined solely from the radial-velocity data. The orbits are circular and have quite small mass functions of 0.001-0.03 M-.. The infrared velocities of AG Dra do not show the large orbital velocity residuals found for its optical radial velocities.
引用
收藏
页码:3255 / 3264
页数:10
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