Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-26
Astron.Lett.33:720-728,2007; PismaAstron.Zh.33:809-818,2007
Astronomy and Astrophysics
Astrophysics
14 pages, 4 figures, 2 tables
Scientific paper
10.1134/S1063773707110023
Currently available data on the field of velocities Vr, Vl, Vb for open star clusters are used to perform a kinematic analysis of various samples that differ by heliocentric distance, age, and membership in individual structures (the Orion, Carina--Sagittarius, and Perseus arms). Based on 375 clusters located within 5 kpc of the Sun with ages up to 1 Gyr, we have determined the Galactic rotation parameters Wo =-26.0+-0.3 km/s/kpc, W'o = 4.18+-0.17 km/s/kpc^2, W''o=-0.45+-0.06 km/s/kpc^3, the system contraction parameter K = -2.4+-0.1 km/s/kpc, and the parameters of the kinematic center Ro =7.4+-0.3 kpc and lo = 0+-1 degrees. The Galactocentric distance Ro in the model used has been found to depend significantly on the sample age. Thus, for example, it is 9.5+-0.7 kpc and 5.6+-0.3 kpc for the samples of young (<50 Myr) and old (>50 Myr) clusters, respectively. Our study of the kinematics of young open star clusters in various spiral arms has shown that the kinematic parameters are similar to the parameters obtained from the entire sample for the Carina-Sagittarius and Perseus arms and differ significantly from them for the Orion arm. The contraction effect is shown to be typical of star clusters with various ages. It is most pronounced for clusters with a mean age of 100 Myr, with the contraction velocity being Kr = -4.3+-1.0 km/s.
Bajkova Anisa T.
Bobylev Vadim V.
Lebedeva S. V.
No associations
LandOfFree
Galactic Rotation Parameters from Data on Open Star Clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Galactic Rotation Parameters from Data on Open Star Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galactic Rotation Parameters from Data on Open Star Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-694874