[Aavso-photometry] variable comp star in field of TT Ari?

[Denis Denisenko]

Hello Jim and all! 

Jim Roe writes: 

> It looks to me like the 111(11.075) star brightened substantially in
> one day. 
> Comments, questions?

Looks like BD+14 339 = TYC 1207-1550-1 is variable indeed.  Is it 111 comp? 

Coordinates (J2000.0): 02 06 19.092 +15 03 40.66 (16.2' away from TT Ari)
Tycho mags are B=11.0, V=10.6 

NSVS 9251826 is within 1" (2:6:19.08 15:3:41.47):
<http://skydot.lanl.gov/nsvs/star.php?num=9251826&mask=32004>
ROTSE range of variability is 10.58-10.76 with individual errors as low as 
0.01m.  The ratio of Mag Scatter vs Median Error parameters (0.032/0.01=3.2) 
indicates the significant variability. 

Also this star (spectral class F8-G0) is a faint X-ray source with ROSAT 
flux 0.0062 cts/sec (not present in 1RXS or ROSAT faint source catalogues 
but detected in long-exposure high Galactic latitude survey). 

My guess: a variable of RS CVn type. 

Den in Moscow