[vsnet-chat 3512] EO Eri ( NSV1710 ) - A Mira Variable

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

Hello All,

I am currently drafting a brief paper on the Mira type variable EO Eri
(NSV1710; IRC-20062; IRAS 04430-2356) covering observations obtained during
the interval 1990 November through 2000 March.

These observations, by members of the VSS RASNZ, indicate this is a typical
Mira star of period 447.5 days and visual magnitude range 10.6 to fainter
than 15.5.  At minimum, EO Eri has been shown to fade to a photographic
magnitude near 18.

An epoch for maximum brightness is : JD 2448597 + 447.5 days.

Two types of maxima are evident: (1) bright maxima averaging magnitude
10.6, and (2) faint maxima peaking near magnitude 11.6, the latter being
much broader at maximum and remaining near maximum brightness  for upto 8
weeks.  There is, however, no evidence to suggest a double wave light curve
(such as seen with R Cen) as was suggested by Wenzel in IBVS3504 but the
above period agrees well with that found by him.

Based on the above elements, EO Eri should have reached maximum during the
first week of July for those who work the morning sky.

Regards

Peter Williams
Heathcote NSW

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