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AAVSO Special Notice #61: N Vul 07 is now V458 Vul AAVSO HOME > publications > special notice

AAVSO Special Notice #61

N Vul 07 is now V458 Vul
August 22, 2007

In CBET 1038, the GCVS has given the nova the formal
name of V458 Vul.  Please use
1950+20  V458 Vul
for all future submissions through WebObs.

This nova has exhibited several maxima near 8th magnitude,
with minima near 10th magnitude in between.
The spectra likewise show large variations, with Balmer and
FeII emission lines that show P Cyg profiles at the maxima
that disappear during the minima.  See, for example,
for a good blue wavelength spectra of the nova.
Skoda et al. in CBET 1035 and Kiss in CBET 1038 indicate that
the emission lines are broad and almost flat-topped.

Note that CCD images with 15arcmin field of view or larger
will also include SS Vul, a 170-day Mira variable, towards the ENE
(coordinates: 19:54:51.74 +20:55:43.3; currently at V=14.8).
You might submit estimates for SS Vul at the same time as
for V458 Vul, especially as the nova fades.

We are working on updating the photometry in VSP, but in the
interests of providing a BVRI calibration of this field, please
use the following interim values for the bright comp stars in
this field (give a chart ID/date of 070822 for all submissions
using these values, and list the comp stars used):

 ID    RA (J2000) DEC          B      V    Rc    Ic    B-V
VAR 19:54:24.63 +19:54:24.6  11.12  10.34  9.01  8.74  0.78
 88 19:54:07.27 +20:54:50.4  10.17   8.83  8.15  7.43  1.34
 98 19:54:40.47 +20:57:01.3  11.00   9.80  9.20  8.62  1.20
100 19:55:06.27 +20:51:54.7  11.20  10.00  9.39  8.86  1.20
101 19:54:39.29 +20:45:43.2  10.26  10.15 10.10 10.01  0.11
102 19:55:07.26 +20:59:28.7  10.46  10.24 10.16 10.01  0.21

Errors on all magnitudes are 0.03mag.  V and Ic magnitudes are
from Richard Miles (except for 100); B and Rc magnitudes are 
from SRO.  Note that several of these stars are red and others
are blue, so at the current brightness, there is no really good
color match with the variable.  There are three nice 11th magnitude
stars that we will use as the nova fades.


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