[Aavso-photometry] ALERT: KN Gem in outburst?

Tue Jan 25 21:54:33 EST 2005

It's clear here so as soon as I finish on my current target (about 45 
minutes) I'll grab a couple of quick images.

Shawn

----- Original Message ----- 
From: "Mike Simonsen" <mikesimonsen at mindspring.com>
To: <cvnet-outburst at yahoogroups.com>
Cc: <aavso-photometry at mira.aavso.org>
Sent: Tuesday, January 25, 2005 9:47 PM
Subject: [Aavso-photometry] ALERT: KN Gem in outburst?

> This was reported to AAVSO today:
>
>  KN GEM 0629+26  (UG:):
>    JAN 25.4027  2453395.9027   14.6   JM    CCDV
>
> If this is not a misidentification it would be a significant observation 
> of
> a long lost CV!
>
> The only positive observation of KN Gem is the discovery observation
> by Morgenroth on a single plate exposed on 24 January 1936KN Gem, at
> photographic magnitude 13.0.
>
> I have a chart based on the Henden Sumner sequence here:
> http://joevp.20m.com/cgi-bin/i/charts/henden/And%20to%20Gem/Gem_KN_C_standard.gif
>
> Bruce Sumner's sequence follows:
>
> 354  KN GEMINORUM   (UG)   Range: 13.0-<15.5p
>     Position:   06 35 51.55  +26 52 58.0   (J2000, DWS)
>     Magnitude:
>
> ID     RA  (2000)   DEC       X    Y   N    V      ERR     B-V    ERR 
> SRC
>
> a) Comparison star sequence
>
> 1    06 36 17.5  +26 57 11   346  253  4  11.657  0.125   0.333  0.052
> 2    06 35 56.2  +26 52 51    62   -7  4  11.680  0.120   1.003  0.074
> 3    06 36 21.7  +26 54 15   403   77  4  11.981  0.088   1.190  0.066
> 4    06 36 20.2  +26 48 08   383 -290  4  12.328  0.049   0.920  0.033
> 5    06 35 51.5  +26 52 21    -2  -37  4  12.650  0.014   0.879  0.010
> 6    06 36 13.9  +26 53 36   298   38  4  12.884  0.015   0.513  0.010
> 7    06 35 44.4  +26 54 36   -96   98  4  12.988  0.017   0.525  0.010
> 8    06 35 59.5  +26 51 57   106  -61  4  13.412  0.017   0.122  0.010
> 9    06 36 23.2  +26 54 33   423   95  4  13.690  0.015   0.968  0.009
> 10   06 35 53.5  +26 52 03    26  -55  4  13.879  0.014   0.544  0.008
> 11   06 36 11.0  +26 51 12   259 -106  4  14.323  0.017   0.611  0.011
> 12   06 36 21.5  +26 51 48   401  -70  4  14.643  0.014   0.874  0.011
> 13   06 35 57.3  +26 50 50    77 -128  4  14.708  0.015   0.605  0.009
> 14   06 36 09.3  +26 52 39   236  -19  4  15.118  0.016   0.550  0.013
> 15   06 35 52.3  +26 53 49     9   51  4  15.446  0.014   0.609  0.006
> 16   06 35 53.9  +26 50 41    31 -137  4  15.603  0.017   0.489  0.012
> 17   06 35 59.7  +26 53 50   108   52  4  15.932  0.012   0.612  0.006
> 18   06 35 50.8  +26 50 01   -11 -177  4  16.198  0.016   0.587  0.021
> 19   06 36 19.0  +26 53 46   366   48  4  16.256  0.013   0.581  0.004
> 10   06 35 51.0  +26 52 50    -7   -8  4  16.500  0.017   0.726  0.012
> 21   06 35 49.1  +26 53 07   -33    9  4  17.081  0.000   0.652  0.014
> 22   06 35 50.2  +26 53 02   -19    4  4  18.094  0.019   0.757  0.112
>
>
> b) Wide-colour extension for CCD calibration
>
>     06 36 00.2  +26 54 09   115   71  4  14.638  0.019   0.276  0.010
>     06 36 16.1  +26 59 51   328  413  1  15.415  0.003   1.497  0.007
>
>
> Notes:
>
> 1. The four brightest stars of this sequence are saturated and their
> magnitudes are approximate. However they do have reliable ASAS-3
> magnitudes:
>
>      Henden          ASAS-3
>   ID  V      B-V       V
>   1    11.657  0.333    11.51+/-0.04
>   2    11.680  1.003    11.55+/00.03
>   3    11.981  1.190    11.81+/-0.05
>   4    12.328  0.920    12.34+/-0.07
>
> 2. There is another star in this field with a reliable ASAS-3 magnitude:
>
>  06 36 08.3  +26 47 25  V=11.01+/-0.03
>
> 3 The only positive observation of KN Gem is the discovery observation
> by Morgenroth on a single plate exposed on 24 January 1936KN Gem, at
> photographic magnitude 13.0. There is therefore no quiescence magnitude.
> However Henden's photometry indicates no varying blue candidate in the
> immediate vicinity of Morgenroth's position down to magnitude 19. Thus
> if this variable exists, and is a dwarf nova, it must have a vary large
> amplitude.
>
> 4. There is a bright Mira variable in this field, BR Gem, with which
> KN Gem has been misidentified in the past (see IAUC 5083, 23 May 2001).
> This variable was observed during the photometric determination as
> follows:
>
> 06 36 19.9  +26 52 54   378   -4  4  13.995  1.216   1.354  0.074
>
> BR Gem has a range of 10.5-<15.5p and a period of 156 days. This sequence
> is also suitable for this variable.
>
>
> Bruce Sumner
> 17 February 2004
>
> Mike Simonsen
>
> *********************************
> C. E. Scovil Observatory
> http://home.mindspring.com/~mikesimonsen/
> AAVSO Chart Team
> charts at aavso.org
> CVnet Administrator
> http://cvnet.aavso.org
>
> **********************************
>
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