[vsnet-chat 2873] CI Aql

[Gary Poyner <gp@star.sr.bham.ac.uk>]

Taichi asks why CI Aql was dropped from the UK Recurrent Objects
Programme.  Well it was mainly down to the following vsnet-obs
message that CI Aql was officially dropped from the programme
in 1998.

I have had sleepless nights thinking about this since CI Aql
decided to go recurrent, particularly as I had myself made many
observations of the field!

U Leo remains (for the time being) on the Programme.

regards,
Gary Poyner

---------------------------------------------------------------
>From owner-vsnet-obs@kusastro.kyoto-u.ac.jp Sat Sep 30 18:44 BST 1995
>Date: Sun, 1 Oct 1995 02:27:51 +0900
>From: tkato@kusastro.kyoto-u.ac.jp
>To: vsnet-obs@sanma.kusastro.kyoto-u.ac.jp
>Subject: [vsnet-obs 1259] CI Aql -- eclipsing variable

>According to IBVS No. 4232 (Mennickent & Honeycutt), CI Aql, which 
>has been suspected to be a low amplitude nova or dwarf nova in 1917, 
>is now shown to be a short-period eclipsing binary with a period of 
>0.618355 day. The light curve in IBVS looks like a beta Lyr-type 
>eclipsing system.  The depth of primary minima reaches 0.6 mag.

>This paper also tells spectroscopic observations have shown no 
>emission lines, but absorption lines; some of them seem to originate 
>from a red (evolved?) secondary of spectral type K-M.

>To my knowledge, this is the second case that an old suspected nova
>is proven to be a short period, seemingly non-cataclysmic, variable.
>The second one is U Leo.  I wonder what happened in these systems at 
>the time of possible brightening?

>Regards,
>Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp