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(fwd) Re: YSOs and J-Ks
This message is from Brian Skiff:
In re reddening toward/around pre-main-sequence stars (even if only
just above the MS), it could be that the size of the dust grains is
different/bigger/smaller than for the stuff that produces the ordinary
interstellar extinction, thus making the observed extinction different
from what you would expect from the various color ratios (or, the results
at different wavelengths would be contradictory). I don't know enough
about it. I think there is quite a lot of UBVRIJHKLM... photometry
for the brightest examples of such stars (Orion, Taurus, rho Oph regions).
For some reason the work of Eugenio Mendoza comes to mind, such as
1966ApJ...143.1010M, 1967AJ.....72..816M, and 1968ApJ...151..977M,
which were obvious from a quick look in SIMBAD. Doubtless there's lots
more (the Stroms, Fred Vrba, Erik Rydgren, various Russians?, et al.).
This is good stuff, by the way, John, and ought to be summarized
somewhere (JBAA, Observatory?) partly as an example of the synergies coming
from combining on-line (pro/am) databases, but also showing useful
diagnostics in big surveys.
\Brian
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