[vsnet-newvar 470] DELTA SCORPII - GCAS???

[Sebasti若n Otero <varsao@fullzero.com.ar>]

The bright B0.5IV  star DELTA SCORPII is probably brighter than normal.

It looks like 2.2 instead of 2.3.  

I searched for photometric data in the past and there are several measurements in the range 2.31 - 2.33.  But there is one isolate 2.21 (Hogg A.R., 1958, "Photometric observations of 244 bright stars") that makes me suspicious. It's been some weeks since I noticed this probable little brightening but I hadn't paid much attention. In addition, the Hipparcos Catalogue gives a brighter value of 2.29.

Several suitable comparison stars may be used in estimating:

 

GAMMA CEN:  2.16

ALPHA LUP and EPSILON CEN:  ~2.30*

KAPPA SCO:   2.40*

ETA OPH:       2.43

 

(These 3 stars are BCEP variables but the amplitude is very small)

 

Of course, the variability is too small for being followed visually, but it would be interesting to do some photometry in order to confirm this probable brightening. Could it be a possible GCAS variable? The behaviour is similar to that of ALPHA ARAE and ETA CENTAURI. Could a new spectrum taken right now show emission lines?

 

I hope someone can measure it. I just have my eyes...

 

Sebasti疣 Otero.

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