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Using the _NAMED macros create a named log4cxx logger, which adds the name to each log message on rosout and allows you to set the log level for those messages separately, but it's using the same appender and appending to the same log file by default.
I haven't done it myself, but if you can figure out how to configure log4cxx by following the rosconsole configuration you can redirect the output for your named logger to a separate file.
I'm not sure why you're not seeing a stderr log; I believe those are set up by roslaunch, so it may be related to where you're sending the node output from roslaunch. (output="log" vs output="screen") (if you're not using roslaunch, you won't have a stderr log at all)
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