[vsnet-alert 8817] URGENT= NSV 18024 Spectra an photometry needed
varsao at fullzero.com.ar
Fri Jan 27 04:21:06 JST 2006
Another NSV 19448-like system??
And also in the Southern sky in the constellation Vela.
NSV 18024 = HD 74771 is in outburst.
Position: 08 44 34.05 -37 57 52.5 (2000.0)
URGENT= outbursts last only a little bit more than 2 weeks for this one and
it started 5 days ago.
We have less than 12 days to do something.
This star was found to be another peculiar object back in August while
checking the NSV catalogue against ASAS-3 data.
It is classified as a G8-K0 star (G8IV/VCNIII in some sources).
Check out the current outburst in ASAS-3 data:
The quasi-period this time was near 490 days but as in the case of NSV
19448, the current outburst came up early: 290 days after the last one.
Hipparcos caught 3 events and ASAS has now caught 4. Seven outbursts to
speak of then and all of them are very similar
lasting around 17 days and with a very symmetric shape. Small scatter, the
extreme infrared brightness that the mira should have to affect the results
at tha 8th mag. level in V, and the narrowness of the brightenings almost
exclude the background mira possibility again. Maybe a CV then?
Amplitude is between 0.1 and 0.2 mag. and the star goes from its quiescent
V= 8.13 level up to 7.95 - 8.0.
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