[vsnet-chat 5739] CL Puppis

["Mike Simonsen" <mikesimonsen@mindspring.com>]

Hi All,

I have followed with some interest the recent antics of CL Pup, as reported
by Rod Stubbings and Andrew Pearce primarily.

CL Pup is listed as a non-cv in Downes et al; the RASNZ chart lists it as
IS:, and the GCVS lists it simply as 'rapid irregular'.

Rod emailed me November 1, noting he had seen it in outburst around V=14.4
on many occassions and as bright as 13.8 at times. He asked if I might come
up with a chart for it, seeing as the RASNZ chart only had letters and there
is no AAVSO chart for this star.

I cobbled together a preliminary sequence from USNO A2.0 mags and sent it
off to him right away. I figured it was important if Rod actually wrote two
paragraphs about it in an email! For those of you who don't know him, his
judicious use of the language is legendary :-)

Arne Henden was able to get data on three nights in this field, in spite of
some pretty horrible weather, so there is now a CCD(V) sequence and chart
for this interesting star on the Sirius Astronomy website at-

http://joevp.20m.com/charts/henden/Her%20to%20Vul/

I made a concious effort to retain the stars in the original RASNZ sequence,
but three of them were too red to be included in a proper sequence. They are
listed in the notes for reference.

One thing that jumps out right away from the dat file is that this star is
too red to be a CV (B-V=1.434). It is indeed a 'rapidly irregular' star with
some secrets to give up yet.

Those of you lucky enough not to have light pollution or trees blocking your
view might consider adding this unpredictable star to your program.

Happy Hunting,
Mike Simonsen


****************************************
CL Puppis
(2000) 07 30 02.19 -19 29 51.1 (from dat file)
Type ?
Range: 14.0-18.4V
Magnitude:18.359 +/-0.102  B-V=1.434 +/-0.000 (from dat file)
Sequence: CCD(V) A. Henden and M. Simonsen


#  RA(2000)      Dec             N   V        Err      B-V   Err
1  07 29 37.40  -19 27 16.5  3  10.807 0.122 1.012 0.110
2  07 30 26.69  -19 30 37.3  3  12.159 0.027 0.604 0.020
3  07 29 52.62  -19 29 29.3  3  12.547 0.021 0.244 0.020
4  07 30 22.85  -19 27 18.8  3  13.102 0.022 0.353 0.020
5  07 29 58.27  -19 24 38.3  3  13.403 0.022 0.450 0.023
6  07 30 14.96  -19 25 07.5  3  13.704 0.023 0.680 0.026
7  07 30 24.55  -19 28 16.5  3  13.975 0.034 0.687 0.023
8  07 29 56.14  -19 28 53.2  3  14.325 0.021 0.747 0.024
9  07 30 03.29  -19 29 04.0  3  14.706 0.025 0.635 0.018
10 07 30 05.31  -19 29 25.8  3  14.941 0.017 0.554 0.014
11 07 30 04.48  -19 28 47.8  3  15.470 0.032 0.870 0.030
12 07 30 01.68  -19 27 51.0  3  15.787 0.022 0.763 0.025
13 07 29 58.49  -19 27 50.7  3  16.121 0.042 0.871 0.056
14 07 29 58.35  -19 28 07.6  3  16.613 0.038 0.787 0.026
15 07 29 53.54  -19 28 28.1  3  17.188 0.026 0.790 0.131
16 07 30 03.24  -19 29 43.4  2  17.692 0.055 0.761 0.150

Notes:
1-Star 1 is saturated but has a semi-reliable Tycho 2 magnitude of 10.80V.

2-There are three stars in the RASNZ lettered sequence that
are too red for inclusion here.

c  07 29 53.03 -19 29 10.6  3  13.544 0.030 1.175 0.026
f   07 30 01.09 -19 29 53.6  3  14.445 0.035 1.986 0.033
k  07 29 59.82 -19 29 18.4  3  14.211 0.029 1.326 0.027

3-CL Pup seems far too red to be a CV.

Mike Simonsen
December 17, 2002

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