Formaldehyde absorption in S 128

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Absorption Spectra, Formaldehyde, Molecular Clouds, Red Giant Stars, S Stars, Line Spectra, Milky Way Galaxy, Radial Velocity, Radio Spectra, Shock Fronts, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

6 cm H2CO absorption line observations in the direction of S 128 are presented. Using these and other published data it is proposed that the S 128 complex belongs to the Perseus spiral arm, but possesses a rather large peculiar radial velocity of -20 km/sec. The star formation in the complex is ascribed to a local event where a local shock front happened to compress a lump of material at the fringes of the spiral arm.

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