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- W89867166 abstract "Optical absorption line observations of interstellar CH + andCHarepresentedtowardsthesouthernOBassociations CMa OB1,NGC 2439,Vela OB1,NGC 4755,andCen OB1.A totalof5{11starsperassociationwereobserved,withvisualex- tinctions ranging fromAV = 0.5{4.5 mag. The derived CH + and CH velocities agree within the measurement errors. Towards a particular association, the CH + column density N(CH + ) is cor- related to the visual extinction of the background star. These ndings weaken the possibility that magnetic shocks are the general mechanism that is required to produce interstellar CH + . ItisfoundthatN(CH + )iscorrelatedtoN(CH),whichindicates that N(CH + ) is correlated to the optical depth of a cloud. The correlations are difcult to reconcile with scenarios where the sites of CH + formation are constrained to the surface of molec- ular clouds. The observations support ideas which involve tur- bulence as a major CH + production mechanism. In particular, the results are in agreement with expectations from a scenario where the CH + formation proceeds in cool gas via a fraction of fast, non-Maxwellian H2 or C + , created by the dissipation of" @default.
- W89867166 created "2016-06-24" @default.
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- W89867166 date "1997-04-01" @default.
- W89867166 modified "2023-09-23" @default.
- W89867166 title "Interstellar CH + in southern OB associations" @default.
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