[vsnet-lpv 120] NSV5087 Carinae - A Large Amplitude Red Variable

["Peter F Williams" <pfwilliams@onaustralia.com.au>]

Hello All,

Attention is directed to NSV5087 Carinae (HV8337, CVS1705) as a large
amplitude red variable.  Visual observations obtained at Heathcote during
the 5 years 1998 through 2002 show NSV5087 is a typical Mira type star of
magnitude range 11.6 to 15.2 with a mean period near 274.38 days and M-m
0.47P.  A preliminary ephemeris for maximum brightness is JD 2451646.1 +
274.38 days.

NSV5087 is plotted on VSS RASNZ chart 912 for the nova like variable QU
Car.  Care must be taken not to confuse NSV5087 with two faint ~15 mag
field stars immediately east of the variable but not plotted on this chart.
 It should also be noted the above minimum magnitude may actually refer to
the fainter and closer of these two stars.

6 cycles are clearly evident in the 133 available observations.  The
average period for maximum is 274.38 days (range 250.5 to 282.2) and 275.23
days for minimum (range 269.3 to 283.4).  The WWZ transform program
available on the AAVSO web site yields periods 270.27 to 285.71 with an
average 277.89 days which is in good agreement with the above adopted
period.

A brief paper summarising these observations will be submitted to the
Publications of the VSS RASNZ shortly.  All observations are available from
the data base of the VSS RASNZ by contacting the Director at
varstar@xtra.co.nz.

Regards,

Peter Williams
Heathcote NSW

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