Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..103r&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 20, Issue 1, pp.103-106
Astronomy and Astrophysics
Astronomy
1
Kinematics, Spiral Structure, Open Clusters, Cepheid Variables
Scientific paper
Space velocities of young open clusters and cepheids with periods greater then 9 days show systematic deviations from purely circular motion that can be considered as arguments in favour of the wave nature of the galactic disk. The radial scale length of radial and azimuthal deviations is close to 2 kpc, whereas the corresponding amplitudes are close to 7 and 2 km s-1 respectively. This value of the radial period well fits the spiral pattern with a pitch angle i = 5° and two arms rather then four arms near the Sun. The most likely solution for the space velocity field has been derived by taking into account pure rotation and noncircular perturbations due to the effects from the spiral density wave. Estimates of the spiral pattern angular speed, p, calculated from radial and azimuthal amplitudes of the residuals, seem to be unreliable.
Baumgardt Holger
Glushkova Elena V.
Rastorguev Alex S.
Zabolotskikh Marina V.
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