[Aavso-photometry] Nova Vul 2007: fading has accelerated

[RICHARD MILES]

Further to the previous note below, I can report that about Aug. 10.01UT, 
Nova Vul 2007 embarked on a further acceleration in it's fade.  In just over 
4 hours since 21:00UT, the object has faded in V by 0.30 mags whereas the Ic 
magnitude has only faded by less than 0.08 mags.  The short-term decline 
rate between 00:30-01:20UT has grown to about 4 mags/day in V and 1.2 
mags/day in I.  Latest observations (at 02:00UT) indicate that the fade 
continues to accelerate!

Richard Miles
Golden Hill Obs., Dorset, UK

----- Original Message ----- 
From: "RICHARD MILES" <rmiles.btee at btinternet.com>
To: <baavss-alert at yahoogroups.com>; "AAVSO photometry" 
<aavso-photometry at aavso.org>
Sent: Thursday, August 09, 2007 10:48 PM
Subject: Nova Vul 2007: On a steep decline for sure !


>A marked change has occured with this nova in the last 24 hours, not only 
>is it currently declining at 1.4 mag/day, it is becoming increasingly 
>reddened in V-I at a rate of 0.9 mag/day.
>
> By happenstance, the V-I colour at around 20:36 UT was +0.83, which was 
> the same as that measured earlier today at about 00:01 UT.  It has 
> therefore switched from a blueing trend to a strong reddening trend today.
>
> Richard Miles
> Golden Hill Obs., Dorset, UK
>