[vsnet-alert 10390] Re: [AAVSO-DIS] New CV from 1RXS catalog

[Christopher Watson]

Denis,

Are you providing details of these discoveries to VSX?

-Christopher



On Jul 31, 2008, at 11:00 AM, Denis Denisenko <denis at hea.iki.rssi.ru>  
wrote:

> Dear all,
>
> We have just reported the discovery of a new cataclysmic variable in
> Ophiuchus to The Astronomer's Telegram (ATel #1640,
> <http://www.astronomerstelegram.org/?read=1640>).  This is an  
> eclipsing
> polar with a period of 1.68089 hr (100.853 min).  The star's average
> brightness has jumped by 1.0m (from 17.1 to 16.1) between May 31st and
> June 13th, and is still growing (15.7 as of July 27).  It will be
> interesting to follow the general trend in a few next months.
>
> The data in RK catalogue format follow:
>
> J1808+1010   *               18 08 35.8 +10 10 30 1 NL  AM
> 15.7   17.0   17.1   18.4
> 0.070037                                  1
>
> J1808+1010               = USNO-A2.0 0975-10560872
> J1808+1010               = USNO-B1 1001-0317189
> J1808+1010               = 2MASS 18083580+1010298
>
> This is the first in a series of cataclysmic variables I have  
> identified
> among the ROSAT X-ray sources during the last year.  There are at  
> least
> 6 (six) more CVs waiting for publication, including one dwarf nova
> 17.5-13.5m and two very interesting objects with unusually high X- 
> ray to
> optical flux ratio and both long-term and fast variability.  One of  
> them
> may be AM CVn system, the other - possibly neutron star or black dwarf
> transient.  For this one (J1808+1010) we have managed to determine the
> orbital period using "merely" a 30-cm telescope.  The others are  
> fainter
> and require larger scopes to uncover their nature.  For two objects
> currently visible I have asked for observations on 1.5-m telescope in
> Turkey, but RTT150 observing schedule is very dense, and I'm  
> discovering
> more new interesting objects than it can explore. ;-)
>
> As a by-product of searching for X-ray source identifications, I have
> found many new quasars still not published anywhere, a few white  
> dwarfs,
> several common proper motion (CPM) pairs of nearby red dwarfs and at
> least five new RS CVn stars (see PZP 8, 25,
> <http://www.astronet.ru/db/varstars/msg/1227871>).  Btw, there are  
> also
> two new RRAB variables in the field of J1808+1010 to be published in  
> PZP
> soon. :-)
>
> Discovering the new variables is fun, exciting and - believe it or  
> not -
> easy!  Some days I have five or even ten new ones!
>
> Best regards,
>
> Den in Moscow
> --
> Denis V. Denisenko
> Space Research Institute
> Profsoyuznaya st., 84/32
> 117997, Moscow, Russia
> denis at hea.iki.rssi.ru
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