[vsnet-alert 15346] Re: MASTER OT J095310.04+335352.8 - fading of TYC 2505-672-1 (ATEL)

Brian Skiff bas at lowell.edu
Tue Feb 5 11:45:52 JST 2013

> ==============================================================================
> ATEL #4784							     ATEL #4784
> Title:	Optical "anti-transient" detected by MASTER 

> The spectral class of TYC 2505-672-1 is reported as M2III in Pickles 
> et al., 2010 

     Bear in mind that these "spectral types" were derived from 
SED fits and _not_ from actual spectra, and are commonly grossly
in error.  This particular one seems to be a correct inference for
an unreddened star --- but it is not obvious that this is an
ordinary M-giant.

>  The object was not 
> detected in 1RXS and IRAS bright source catalogs. 

     But it is in the IRAS faint-source and AKARI catalogues as
a good 12-micron source.  The IRAS 'faint-source' survey is
in fact the definitive reduction of the IRAS survey outside
the galactic plane, so it is the preferred version of
this catalogue.

     Be careful interpreting catalogue data!


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