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NSV 2954 = HD 46095 = CD-31 3357 = CPD-31 1186.
Position: (2000) 06:30:00.62 -31:10:28.1
HD 46095 (7.52V, sp. A0V) was by chance found to be abnormally
faint by Hawarden (1975) while setting up a photoelectric sequence near the
open cluster NGC 2243. However, no other details on this sighting (date,
mag. range etc) were given. He believed the star to be an eclipsing binary
of long period, but no further investigation has been done.
The star was duly included in the NSV catalogue (1982) as NSV 2954.
However, due to a misprinted HD number in Hawarden's paper an incorrect
position and spectral type were published in the NSV. The correct details
were provided by Morel (1992).
ASAS-3 data.
=========
I have looked up the ASAS-3 light curve for NSV 2954, and it
contains some intriguing observations. The ASAS-3 log for this star
commences when it was significantly below its normal brightness. It dropped
to 8.48V at one point (HJD 2451875), returning to max. by 2451884. However,
there is considerable scatter in the data points between these extremes.
Even if ASAS-3 managed to catch NSV 2954 rising from an "eclipse", it does
not seem to be a typical eclipsing binary. The rising branch, according to
ASAS-3 data, is just too disturbed. Between the deep minimum of HJD 2451875
and 2452800 ASAS-3 failed to log any further deep fades, except for a fade
to 8.05V on 2452128. The beginning of this fade was missed.
If NSv 2954 is an eclipsing binary, then the period could be of the
order of 400 days, No further fadings are evident in the ASAS-3 light curve,
at the right times, even allowing for the fact that there are gaps in the
coverage.
I am no expert on eclipsing binaries, but I suspect that there
is/could be a different dynamic at work in NSV 2954. Considering that this a
relatively bright star with fadings that approach 1.0 mag, it should be easy
to pick up on patrol photos.
The ASAS-3 does confirm the variability of NSV 2954, and provides a
definitive range - 7.54 to 8.48V. The type of variation, and period (if
any), are in doubt.
Refs:
===
Hawarden, T.G.: 1975, Mon. Not. R. ast. Soc., 173,801.
Morel, M.: 1992, IBVS 3701.
--Mati Morel
Thornton NSW 2322
E151:38:33
S32:46:47
morel@ozemail.com.au
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