[vsnet-chat 5042] KV CMa eclipses

["Sebastian Otero" <varsao@fullzero.com.ar>]

This info may be of interest for vsnet-chat readers.

KV CMa in a third eclipse confirmed (and possibly one secondary eclipse
too).
The star was caught on January 22.0, 0.25 mag. fainter than normal.
Eclipses for KV CMa seems to be rather long (in the order of a day or so)
and the period may be long too.

This message is in reply to Seiichiro Kiyota:



Dear Seiichiro:

V magnitude at maximum is recorded as 7.14-7.20 (some possible intrinsic
variability)
I also thought of a period of 171 days. Actually 171.45 d.
I will send a lightcurve to the vsnet-image list.
Note that with this period a secondary eclipse is well-placed at phase 0.47.
Anyway more observations are needed.

Cheers,
Sebastian.


----- Original Message -----
From: "Seiichiro Kiyota" <skiyota@nias.affrc.go.jp>
To: <vsnet-campaign-ecl@ooruri.kusastro.kyoto-u.ac.jp>
Cc: <vsnet-ecl@kusastro.kyoto-u.ac.jp>
Sent: Friday, January 25, 2002 1:11 AM
Subject: [vsnet-ecl 510] Re: KV CMa


> In message "[vsnet-campaign-ecl 43] Re: (fwd) Re: KV CMa",
> Sebastian Otero wrote...
>  >From Hipparcos and my observations the eclipse lasts probably more than
1
>  >day. Tonight I will be observing too.
>
> My recent observation of KV CMa are;
>
> CMAKV 20020122.540 7.25V Kis
> CMAKV 20020122.540 7.39Ic Kis
> CMAKV 20020122.540 7.03B Kis
> CMAKV 20020123.493 7.23V Kis
> CMAKV 20020123.493 7.39Ic Kis
> CMAKV 20020123.493 7.00B Kis
> CMAKV 20020124.494 7.24V Kis
> CMAKV 20020124.494 7.43Ic Kis
> CMAKV 20020124.494 7.02B Kis
>
> My last observations are 7.22V on Feb 15 and 16, 2001.
> All observations match very well, thus I think that these are the
magnitude at out of eclipse in my instruments.
> From my and Mr. Otero's observations, I think that duration of eclipse is
one day or less.
> It is very short! We need day-to-day monitoring to catch next ellipse.
>
> Anyway,
>
> Minimum timings of KV CMa were reported as follows;
>
> 2448353.5 HIPPARCOS
> 2451954.6 Otero
> 2452296.6 Otero
>
> Difference of two minima observed by Mr. Otero is 342 day.
> Difference between HIPPARCOS and Otero’s are 3601d and 3943d,
respectively.
>
> 3601/342=10.5
> 3943/342=11.5
>
> So, I estimate that period of KV CMa is 171d.
> I do not examine possibility that true period is 171/n or not, yet.
>


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