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Comune di Capannori


Photoelectric photometry of variable stars


At OAC we are engaged in a series of activities involving photoelectric photometry of variable stars. Many of these activities are still working in progress, so here we don't deal with them.

Nova Delphini 2013

Nova Delphini 2013 = V339 DEL was discovered around mid August 2013 by the japanese amateur Itagaki.
At OAC we decided to include V339 DEL among the targets to be photoelectrically monitored. Actually V339 DEL was monitored both photoelectrically and spectroscopically at OAC; in fact this target was included in our C.A.T.S. project which stands for Capannori Astronomical Transients Survey. You can find more about C.A.T.S. project in the following link (CCD Photometry and Imagery).
A couple of days after the discovery, we made our first photoelectric photometry and CCD spectrography of V339 DEL.
In the aftermath we monitored the photometric and spectroscopic developement of V339 DEL. Some preliminary results of this monitoring are listed in the following two papers published on line:


Santangelo, M. M. M.,Pasquini M., Gambogi S., Cavalletti G., 2013 ATel.5313

Santangelo, M. M. M.,Pasquini M. 2013 ATel.5295

In ATel 5295 we were the first in the world to claim the presence of the NIR neutral oxygen triplet at 777.4 nm. Moreover we were among the first to claim the presence of strong P-Cygni profiles of Hydrogen, Fe II, and various other elements. We were also the first to publish R band photoelectric photometry of this nova.
Finally in ATel 5313 we were the first in the world to publish an estimate of the distance of V339 DEL.




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