Abstract
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; that is, the program I (538 stars), l(2)=-0.5410 degrees; program II (100 stars), l(2)=-0.4937 degrees; and program III (60 stars), l(2)=-0.9495 degrees. 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 +/- 9.40kms(-1). A possible explanation for the overestimated values of the second Oort constants has been presented.