[vsnet-alert 3978] Hen3-1431 observations

["Berto Monard" <lagmonar@csir.co.za>]

Hi VSNET readers,

referring to a recent VSNET posting and a publication on its outburst by U Munari, I thought it would be interesting to send my  preliminary values of observations of Hen3-1341 for 1998. They have not been published anywhere because they were awaiting a proper field sequence. I used three nearby comparison stars, which I have calibrated now using the USNOA2.0 / GSPC 'calibration' transfer. 
The derived magnitudes actually show a dramatic brightening of Hen3-1431 in 1998, something that wasn't clear at the time by using comparisonsonly to a selection of 3 lettered stars. 
Unfortunately, due to a priority change regarding observing targets in my program, I did not follow up the 'dramatic' evolution of this symbiotic system. I did not make even one observation of it in 1999, despite the fact that it was not taken off my observing list.... shame on me.

For the sequence I have used the following three comparison stars with derived USNO-A2.0 / GSPC magnitudes (and arounded to my estimated values at the time). I believe the values are still within + or - 0.3 V magnitude (at the 95% confidence level).

USNO A2.0 Id   RA/DE      V(prelim.)

0675-17978761   170851-171824    113
0675-17996077   170906-172244    119
0675-17953518   170830-172321    124

Observations of Hen3-1341 in UT (VSNET format)

Hen3-1341   980422.9   123   MLF
Hen3-1341   980519.8   121   MLF
Hen3-1341   980530.8   118   MLF
Hen3-1341   980621.8   117   MLF
Hen3-1341   980715.7   117   MLF
Hen3-1341   980813.7   116   MLF
Hen3-1341   980920.7   113   MLF


Regards,

Berto Monard

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