[Aavso-photometry] Nova Vul 2007: On the rise still?

[Mika Luostarinen]

Hi all,

Okay, this is not a very accurate lightcurve due to several reason  
(which I do not explain here now :)
but I managed to do some timeseries for this Nova last night.

Here is a simple image of the light curve:

	http://www.semiregular.com/img/Nova2007-Vul.png

The timeframe is from period: 2454321.438 - 2454321.495

So this starts a bit earlier than Richard's curve but seems to  
indicate brightening too..


BR,
-Mika Luostarinen


On Aug 9, 2007, at 5:56 PM, RICHARD MILES wrote:

> Tim Crawford wrote:
>> Using two Tycho2 Stars, with "corrected" V I measured
>> the V mag at 8.403 at UT 2007/08/09/06/28/55.
>
>> Comp Star:
>>
>> 19:54:40.66 +20:57:01.5 "corrected" Tycho2 V mag =
>> 9.861
>> (a bit red with a Bt-Vt of 1.286
>>
>
> Tim - My preliminary measure on this comp star (TYC 1628 0666) gave  
> V=9.802,
> V-I=+1.18.  I have calibrated my frame zeropoints in V for the field
> containing the nova against 6 Hipparcos stars to an absolute  
> accuracy of
> about 0.012 mag.  This suggests that your measure of the nova may  
> actually
> correspond to around V=8.34.
>
> V photometry over a 45-minute period 23:19-00:04 UT under very good
> conditions yielded the following trend, which corresponds to a rise  
> rate of
> 1.48 +/- 0.10 mag/day.  Block average data are as follows.  Each  
> point is
> the average of 100-180 sec of integration using a 6-cm refractor.
>
> 321.4722 8.930
> 321.4746 8.931
> 321.4781 8.920
> 321.4804 8.915
> 321.4832 8.911
> 321.4856 8.907
> 321.4914 8.897
> 321.4937 8.897
> 321.4960 8.905
> 321.4982 8.895
> 321.5005 8.884
> 321.5028 8.882
>
> Looks to be on a strong rise at present.  According to my  
> calculations, your
> measure might indicate a slightly accelerating brightening!
>
> Richard Miles
>
>
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