Kinematics And Ellipsoidal Motion Of The Mid To Late M-Type Stars
  Truly, kinematics in the Solar neighborhood has provided important
information both for the structure and for the evolution of the Galaxy since
the early 20th century. The relationship between Oort constants and the ratio
of the velocity dispersion are important quantities in stellar kinematics. In
the present paper, we calculated the kinematical parameters and the Oort
constants of various samples of late to intermediate M-type stars. We
calculated the velocity dispersion ({\sigma}_1,{\sigma}_2,{\sigma}_3 ) in units
of km s-1 for the samples under study. The longitude of the vertex (l_2 )
having negative values with our analysis; i.e., the program I (538 stars), l_2
=-0_.^o 5410, program II (100 stars), l_2=-0_.^o 4937 and program III (60
stars), l_2=-0_.^o 9495. We calculate the Oort constants as A=14.69+-0.61 km
s-1 kpc-1 and B=-16.70+-0.67 km s-1 kpc-1, and the rotational velocity
V_o=257.38+-9.40 km s^(-1). A possible explanation for the overestimated values
of the second Oort constants has been presented.
