[vsnet-obs 1259] CI Aql -- eclipsing variable

[tkato@kusastro.kyoto-u.ac.jp]

  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