Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-12
Astronomy and Astrophysics
Astrophysics
submitted to the Astrophysical Journal
Scientific paper
10.1086/508251
If the split, asymmetric molecular spectral line profiles that are seen in many starless cores are interpreted as indicative of global collapse or expansion of the core then one possible implication is that most starless cores have short lifetimes on the order of the collapse or sound crossing time scale. An alternative interpretation of the line profiles as indicative of perturbations on an underlying equilibrium structure leads to the opposite implication, that many cores have long lifetimes. While evidence suggests that some cores are collapsing on a free-fall time scale, we show that observations of some other starless cores can be reproduced by a model of non-radial oscillations about the equilibrium configuration of a pressure-bounded, thermally-supported sphere (Bonnor-Ebert sphere). We model the oscillations as linear perturbations following a standard analysis developed for stellar pulsations and compare the column densities and molecular spectral line profiles predicted from a particular model to observations of the Bok globule B68.
Broderick Avery
Keto Eric
Lada Charles J.
Narayan Ramesh
No associations
LandOfFree
Oscillations of starless cores does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Oscillations of starless cores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oscillations of starless cores will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-211002