[vsnet-chat 4169] Re: BO Mus and RX Lep Tentative Periods.

["Stan Walker" <astroman@voyager.co.nz>]

Hi Sebastian and Peter,

I looked up the original file on BO Muscae but there were only 14 measures.
The main target was epsilon Muscae but this is a real random variable from
our data. Below are the measures we do have on BO Muscae. These tend to
support a short period - the DFT says 113.4 days but this is not reliable as
there are few measures on the rise - which appears rather steep. The columns
are JD, V, B-V, U-B. It's noticeable that both the colours vary in antiphase
which suggests a bluer companion as well. There's rather too much UV for a
single SR star. Accuracy is probably +/- 0.02, 0.03, 0.10.

The star we spent a lot of time on was L2 Puppis. This has several
well-defined simultaneous periods which make the light curve wander all over
the place. But hardly enough to get periods as different as 270 and 90-120
days.

It would be interesting to subject the data to a DFT analysis. Any chance of
a copy?

Regards,
Stan

49110.9797,6.231,1.779,.779
49131.02,6.233,1.758,.732
49169.011,5.782,1.822,.864
49211.9076,6.175,1.809,.673
49229.9335,6.404,1.809,.338
49237.8486,6.411,1.82,.515
49845.9648,5.623,1.778,1.431
49851.8632,5.654,1.774,1.356
49861.9065,5.748,1.751,1.344
49864.001,5.767,1.749,1.329
49873.9504,5.883,1.721,1.214
49881.8889,6.005,1.744,1.218
49973.8662,5.804,1.771,.353
49991.8374,5.777,1.75,1.298


----- Original Message -----
From: Peter F Williams <pfwilliams@onaustralia.com.au>
To: vsnet-chat <vsnet-chat@kusastro.kyoto-u.ac.jp>
Sent: Sunday, April 01, 2001 10:00 PM
Subject: [vsnet-chat 4168] BO Mus and RX Lep Tentative Periods.


> Hi Sebastian and All,
>
> Re vsnet-chat 4159, 4162 and 4163, I have eyeballed my old hand written
> visual observations obtained with 10x50mm binoculars for these two stars
> and find the following:
>
> BO Mus.
> Overall magnitude range 5.7 to 7.1 and as Sebastian notes, there are lots
> of ups and downs in the data.  Maximum seem to average near 89.5 days over
> 48 probable cycles, about one third of the proposed 285 day period.
> Individual cycles range between 70 and 120 days.  Minimum average near
90.2
> days over 47 cycles with a similar 70 to 130 day range.  Some cycles show
a
> larger amplitude than others.  I have not checked my more recent computer
> records but from memory BO Mus has been generally fainter in recent years.
>
> RX Lep.
> Publications No10 of the VSS RASNZ notes this star as an irregular
variable
> of magnitude range 5.4 to 6.7 and possible period near 323 days.  This was
> based on observations over a relatively short 902 day interval.  In Publ.
> No18 over 3900 days a magnitude range of 5.1 to 7.0 is given and periods
> 62.5 days for maximum and 70.2 for minimum, indicating a longer time span
> gives a better indication of its true behaviour.
>
> Eyeballing my hand written observations over 14 years between 1982 and
1995
> suggest a 90.9 day period over 53 cycles with a range of 60 to 110 days.
> Minimum suggests a 90.1 day period over 50 cycles with the same 60 to 110
> day range.  A magnitude range of 5.7 to 7.2 is apparent but some cycles
> have a greater aplitude and at time there seems to be little variation at
> all.  Observations through to the present indicate a similar behaviour.
>
> >From this it would appear both BO Mus and RX Lep are SRC type variables.
>
> Trust this is of interest.
>
> Regards
>
> Peter Williams
> Heathcote NSW
>

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