Re: [AAVSO-DIS] Re NSV 13838

[Michael Sallman <msallman@pro-ns.net>]

If anyone is interested, I have put up a "chart" for a 2x2 degree region 
around the position of this star:
http://markivdb.tass-survey.org/servlet/markiv/template/TassChart.vm

Brian Skiff wrote:
>>> It would be 
>>> interesting to know where the spectral type M6 came from;
>>> from Sonneberg or some other list?
> 
>      The MVS paper is one of a series where they were giving spectral
> types of their own from far-red plates taken at Sonneberg.
> 
>>> another red star not far from the nominal position of the NSV star.
> 
>      Both the TASS MkIV data (~25 points over 110 days) and ASAS-3 data
> (66 points over about 200 days) show it to be constant within a few
> percent at around V=10.65 or so (both datasets consistent in zero-point,
> amazingly enough!).  
:-)

> The Tycho-2 BT-VT transforms to standard B-V=1.65
> or so, which is not extraordinarily red.  Also the 2MASS J-K=1.0, which
> is consistent with a type near M0III.  So though this is another good
> candidate, I think it is not red enough and probably also too faint
> (blue mag ~12.2) to be the NSV star.
> 
> \Brian

This is star #3112391, the orange star just left of center.

Have fun,

Mike