| Author(s): | Frink, S., Fuchs, B., Röser, S., Wielen, R. |
| Title: | Derivation of the Galactic rotation curve using space velocities |
| Source: | Astron. Astrophys. 314, 430 |
| Year: | 1996 |
| Abstract: | We present rotation curves of the Galaxy based on the space-velocities of 197 OB stars and 144 classical cepheids, respectively, which range over a galactocentric distance interval of about 6 to 12 kpc. No significant differences between these rotation curves and rotation curves based solely on radial velocities assuming circular rotation are found. We derive an angular velocity of the LSR of Ω_0 = 5.5 ± 0.4mas/a (OB stars) and Ω_0 = 5.4 ± 0.5mas/a (cepheids), which is in agreement with the IAU 1985 value of Ω_0 = 5.5mas/a. If we correct for probable rotations of the FK5 system, the corresponding angular velocities are Ω_0 = 6.0mas/a (OB stars) and Ω_0 = 6.2mas/a (cepheids). These values agree better with the value of Ω_0 = 6.4mas/a derived from the VLA measurement of the proper motion of Sgr A^*. |
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