[vsnet-alert 10431] Re: New CV from 1RXS catalog

[Denis Denisenko]

A few comments on the new CV J1808+1010 = 1RXS J180834.7+101041 = 
USNO-A2.0 0975-10560872 = 2MASS 18083580+1010298.

1) The star USNO-A2.0 0975-10569358 (18 08 45.60 +10 08 45.3) about 3' 
South-East of CV marked on my finder chart 
<http://hea.iki.rssi.ru/~denis/J1808+1010-comps.gif> as R=13.8, B=14.4 
is *variable* itself!  Andrey Samokhvalov has measured the range 
R=13.11-13.66 and a period of 0.26384d.  I have also found this star in 
NSVS database a few days ago, but now the server is not working 
properly.  (Anybody knows what happened to it?)

Anyways, please avoid to use it as a comparison star!  (Note: this star 
is different from two other RRAB stars in the field of J1808+1010 which 
I have mentioned before!  There are already 11 new variables in the 
field identified by now.)

2) Ilfan Bikmaev of Kazan University has calibrated a few stars in the 
vicinity of J1808+1010 using 1.5-m RTT150 telescope and SDSS r' filter.  
The star USNO-A2.0 0975-10560020 (R=15.8 according to USNO-A2.0, 
R1=15.10, R2=15.67 in USNO-B1.0) has r'=16.22, and USNO-A2.0 
0975-10561808 (R=16.1, B=17.3 on my finder chart) has r'=16.3.  Another 
comp star (R=14.4 B=15.5) has r'=14.18.  As I wrote in ATel 1640, I was 
using R=15.8 for Astrotel observations from May to July.  The light 
curve from ATel 1648 
<http://hea.iki.rssi.ru/~denis/J1808+1010-LC-Aug01.jpg> was plotted 
using r'=16.22 value instead.

3) Regarding the addition of this variable to VSX:

Denis Denisenko wrote on Fri, 01 Aug 2008 00:03:25 +0400:

> Christopher Watson wrote:
>
>> Denis,
>>
>> Are you providing details of these discoveries to VSX?
>
> I have just entered the data on J1808+1010 to VSX, and it was given the
> unique ID 000-BFT-547, as well as VSX J180835.8+101030 designation.

I have checked VSX Position Search a few minutes ago, and the only star 
within 30' of 18 08 35.8 +10 10 30 is ASAS 181006+1017.2 (definitely a 
different object).  How long does it usually take for the star to appear 
in VSX after the initial submission by the discoverer?  Are the VSX 
administrators / moderators on holiday?

4) The star has not appeared in Simbad yet, too.  Query for 1RXS 
J180834.7+101041 doesn't produce any references.  ATel #1640 and 1648 
have not yet been indexed by ADS abstract service.

Denis