[vsnet-chat 3580] Re: V1316 Cygni identification

["Lasse Teist Jensen" <teist@image.dk>]

Dear colleagues,

That's excellent.
I must admit I have wondered why the star (the incorrect V1316 Cyg) has had a magnitude around 14.3 ever since I started taking snapshots of this star. I started looking at this star when Gary Poyner reported an outburst to vsnet a few years ago. I guess that Gary has probably also observed the wrong star.

I guess I will have to take a look at my V1316 Cyg images. But I don't think I have caught V1316 Cyg in outburst on any of them.
I would probably have noticed if there were a bright star near the star that I thought was V1316 Cyg.

Regards

Lasse Teist Jensen
CBA-Denmark

-----Oprindelig meddelelse-----
Fra: Bruce Sumner <b.sumner@bom.gov.au>
Til: vsnet-chat@kusastro.kyoto-u.ac.jp <vsnet-chat@kusastro.kyoto-u.ac.jp>; vsnet-id@kusastro.kyoto-u.ac.jp <vsnet-id@kusastro.kyoto-u.ac.jp>; aavso-discussion@informer2.cis.McMaster.CA <aavso-discussion@informer2.cis.McMaster.CA>
Cc: mikesimonsen@mindspring.com <mikesimonsen@mindspring.com>; aah@nofs.navy.mil <aah@nofs.navy.mil>
Dato: 5. september 2000 01:27
Emne: [vsnet-chat 3565] V1316 Cygni identification


V1316 Cygni identification

The position of the potential UGSU variable V1316 Cygni shown in 
Downes and Shara, PASP, 1993, is incorrect. The real variable is 
in fact the faint star (17.58V) some 12 arcsec east of the indicated 
star (14.78V). This has been determined from B and V photometry (the 
candidate is very blue) and magnitude variation in quiescence, using 
photometric data obtained by Henden and Honeycutt for their paper 
Secondary Photometric Standards for Northern Cataclysmic Variables 
and Related Objects, PASP,109,441,1997.

The J2000 coordinates and magnitudes of V1316 Cygni, taken from the 
Henden & Honeycutt dataset, are:

20h 12m 13.67s  +42d 45' 51.4"   V=17.583  B-V=0.252

Extreme care will be necessary not to confuse the close 14.8V 
companion with the variable, particularly when the variable is faint.

Regards
Bruce Sumner

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