Has any simulation been done to produce an accurate visualization of a neutron star, as seen from an observer at distances on the order of 1 AU?
(Edit: I suppose instead of 1 AU I mean "distance such that its angular size is comparable to the Sun's from Earth, or even closer")
At a surface temp of approximately 1 million K, it's "real" color I'd imagine to be dark blue, but with such a high redshift might it actually appear dark red? Right on the verge of being visible at all?
Seems very spooky if so.
Edit: a basic search tells me the higher end redshift at a neutron star's surface is perhaps $z=0.4$, which by the following formula:
$$z+1 = \frac{\lambda_\infty}{\lambda_{surf}}$$
is enough to turn blue light (450 nm) into reddish-orange light (630 nm).
My primary question is, has anyone produced a visualization of one, in the same vein as the black hole visualization featured in Interstellar (not necessarily that high end)?
W can calculate that from a far observer's viewpoint any object falling into a black hole will be redshifted into non-being. My thought was that for a neutron star we might see the same trend with the surface of the star in a static fashion, e.g. if we incrementally added mass until it passed the limit of becoming an event horizon.
UPDATE: I suppose my secret hope is that there could be a version of a neutron star around $1.4r_S$ or so that looks like the following – ghostly red and barely visible, about to recede forever beyond the reach of the outer universe with the addition of a bit more mass.
From ProfRob's answer, it sounds like a neutron star about this size could cool over time until its blackbody spectrum fit the below?
Because of the way the blackbody spectrum shifts, I suppose this cooled neutron star might be indistinguishable from a Red Dwarf star, and a visitor would not realize the difference until it was too late.