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Distribution in galactic longitudes. |
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Distribution of 2245 OH/IR stars in galactic coordinates. The strong concentration
to the galactic plane is in part due to the restricted latitude
coverage of the major OH maser surveys. |
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Distribution of expansion velocities. |
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Galactic latitudes vs. expansion velocities of the circumstellar
shell as measured from the double-peaked OH maser spectra. |
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Flux density distribution.The peak is at ~1 Jy. The decrease
of the number of sources at F < 1 Jy is due to the limited
sensitivity of the major surveys. |
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OH 1612 MHz Maser luminosity distribution assuming (near-)kinematic distances.
A typical 1 Jy maser contributes to the broad luminosity peak
2 < log (LOH) < 3 at distances 3 < d < 12 kpc. |
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Distribution of the OH/IR stars in the Milky Way assuming kinematic
distances. The Sun is at x=0, y=0, the Galactic Center at x=8.5, y=0.
Positions assuming a near (far) kinematic distance are shown in red (blue).
The empty regions are artificial because of a large gradient in the
line-of-sight velocities. |