(cba:news) [Fwd: RE: [cvnet-outburst] HS1340+1542 and SDSS J114628.80+675909.7]

Joe Patterson jop at astro.columbia.edu
Sat Apr 18 09:30:43 EDT 2009

Dear CBAers,

These two recently discovered CVs have popped off, and are well worth a 
long time series (or two - or many, if a periodic term emerges).  The 
nature of these stars is still mostly unknown.

AM CVn has been mighty interesting, with data from Bart Staels, the 
Arkansas gang (Tut Campbell et al.), David Boyd, Bob Koff, and Mack 
Julian.  It's worth going for another week, especially for Euros who 
like the high dec.  In the next message I'll write a long piece about 
our last decade of coverage; the results are too fascinating to quit, 
dooming us, perhaps, to another decade of coverage.

But this is the season for *most* of the AM CVn stars, and I strongly 
commend CR Boo and HP Lib as the best targets for long campaigns in 
April-May 2009.  Except for the occasional mystery dwarf nova popping 
off, these equatorial stars should be prime targets for all.  Even the 
Euros, if they can tolerate these modest decs.

All the other "current targets" should be swept away - respectfully, but
firmly.  These AM CVn stars richly reward very detailed observational 
coverage, but are a lot less valuable when the time series are pretty 

Happy observing!


-------- Original Message --------
Subject: RE: [cvnet-outburst] HS1340+1542 and SDSS J114628.80+675909.7
Date: Sat, 18 Apr 2009 10:15:51 +0000
From: Jeremy Shears <bunburyobservatory at hotmail.com>
Reply-To: cvnet-outburst at yahoogroups.com
To: <cvnet-outburst at yahoogroups.com>, <baavss-alert at yahoogroups.com>
References: <BLU126-W23184DF0E04540193A4FCBC47B0 at phx.gbl> 
<D9B743518B6D4FDF86E63560166A4FC6 at ownerPC>

Thanks Gary.

....I realise I got two of the digits the wrong way round in the name. 
Should be HS1340+1524 (at RA 13 43 23.4 Dec +15 09 16) - sorry, my fault.

Further info on Boris Gaensicke's HQS site here:


Go well!


> To: cvnet-outburst at yahoogroups.com; baavss-alert at yahoogroups.com
> From: garypoyner at blueyonder.co.uk
> Date: Sat, 18 Apr 2009 11:04:29 +0100
> Subject: Re: [cvnet-outburst] HS1340+1542 and SDSS J114628.80+675909.7
> HS1340+1542 confirmed...
> Apr 17.992 14.5
> Only the second time I have seen this one. Outbursts are
> (I think) very short - unless of course this is a superoutburst.
> regards,
> Gary
> -------------------------------------------------------------
> Gary Poyner
> garypoyner at blueyonder.co.uk
> http://www.garypoyner.pwp.blueyonder.co.uk/varstars.html
> "You can always tell a Brummie....but you can't tell him much"!
> --------------------------------------------------------------
> ----- Original Message ----- 
> From: "Jeremy Shears" <bunburyobservatory at hotmail.com>
> To: <baavss-alert at yahoogroups.com>; <cvnet-outburst at yahoogroups.com>
> Sent: Friday, April 17, 2009 11:51 PM
> Subject: [cvnet-outburst] HS1340+1542 and SDSS J114628.80+675909.7
> HS1340+1542 Apr 17.947 14.3C
> SDSS J114628.80+675909.7 Apr 17.934 16.9C
> Jeremy Shears
> Cheshire, UK
> ------------------------------------
> Visit us on the web at http://cvnet.aavso.org
> Yahoo! Groups Links

Beyond Hotmail — see what else you can do with Windows Live.

[Non-text portions of this message have been removed]


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