A gaseous tail ablated from the supergiant IRS 7 near the Galactic center
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Abstract
A tail of ionized gas leaving IRS 7 is detected on a 1-arcsec resolution map of the Ne II 12.8-micron forbidden line emission from the star near the Galactic center. It is suggested that, while the stellar envelope and tail are ionized by the ultraviolet radiation from the Galactic center, ram pressure is more likely to be responsible for the ablation of the supergiant's mass outflow envelope. This ram pressure could arise either in a wind from the vicinity of the Galactic center or in the drag caused by the star's passage through an ambient medium. Numerical calculations of the velocity field expected along the plume for both wind and drag models are reasonably consistent with the observed velocity pattern. Based on the current observations, if a wind is present, the ratio of the wind force to the gravitational force on the star's envelope is about 0.3, while if only a drag medium is present, the drag force to gravitational force ratio is not more than 0.004.
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