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[vsnet-be 2] (fwd) Delta Sco - GCAS???
(fwd) Delta Sco - GCAS???
This article was originally posted to vsnet.
From: Sebasti若n Otero <varsao@fullzero.com.ar>
Date: Fri, 30 Jun 2000 03:57:50 -0300
Subject: DELTA SCORPII - GCAS???
The bright B0.5IV star DELTA SCORPII is probably brighter than normal.
It looks like 2.2 instead of 2.3. =20
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=E1n Otero.
vsnet-adm@kusastro.kyoto-u.ac.jp
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