Ionizing feedback from an O star formed in a filament

We explore a simple semi-analytic model for what happens when an O star (or cluster of stars) forms in isolated filamentary cloud. The is characterised by three configuration parameters: the radius filament, R_FIL, mean density H_2 n_FIL, and rate at which emits ionising photons, Ndot_LyC. show that wide range these parameters, radiation from rapidly erodes ionised gas filament disperses into surroundings. Under circumstances distance to ionisation front (IF) given approximately L ~ 5.2 pc [R_FIL/0.2pc]^-1/6 [n_FIL/10^4cm^-3]^-1/3 [Ndot_LyC/10^49s^-1]^1/6 [t/Myr]^2/3, we derive similar power-law expressions other quantities, example boils off mass shock-compressed layer (SCL) swept up behind IF. very small fraction expended locally, rather amount molecular dispersed. discuss some features more realistic models, extent they might modify or invalidate predictions this idealised model. In particular that, large R_FIL and/or n_FIL low Ndot_LyC, continuing accretion onto trap star, slowing erosion even further.