[Aavso-photometry] HMXB Campaign Time - Lets Go Photon Hunting

[Gordon Sarty]

Hi Thom,

The orbital period for V420 Aur is not known yet - which is why it's on 
my list. But a period of 0.8d has been found by Percy et al. PASP 116, 
178, 2004 from Hipparcos data which likely represents a pulsation 
period. Bart Staels recently (just after Christmas) found an 
eclipse-like event in an all-night time series. Finding more of those is 
the exciting thing here, but finding other pulsation periods is our 
primary objective. I'm guessing that the orbital period may be in the 
hundreds of days range because there seem to be no regular X-ray 
outbursts - this is what we are looking for in our RV data. I'm focusing 
around H beta which, for V420 Aur, has a double peaked emission line in 
the middle of a deep absorption line and the V/R ratio of the two peaks 
is variable.

Gord (SGE)

Thom Gandet wrote:
> What are the (known?) orbital period and amplitude for V420 Aur?
> This star has been on my Be-star monitoring program for several
> years, but I have no observations of it yet as that program was
> put aside for other things.  If the period is short enough, though, I
> may cover some of the light curve at least.  Thanks and good
> luck!
> 
> Cheers,
> Thom Gandet (GTN)
> Lizard Hollow Observatory
> Tucson, AZ
> http://www.lhobs.org
> 
> 
> ----- Original Message ----- From: "Gordon Sarty" <gordon.sarty at usask.ca>
> To: "Keith Graham" <kag at core.com>
> Cc: <aavso-photometry at mira.aavso.org>; "cosmos (Dave Balam)" 
> <cosmos at uvic.ca>
> Sent: Friday, January 09, 2009 8:24 AM
> Subject: Re: [Aavso-photometry] HMXB Campaign Time - Lets Go Photon Hunting
> 
> 
>> Hi Keith and all,
>>
>> Totally no guarantees... ;^)
>>
>> Dave got data last night. LPH040 still shows a nice twin peaked 
>> emission for H beta and the other two (034 and 058) are challenging 
>> Dave with their faintness.
>>
>> Lionel has started looking for periods in some of the data but we need 
>> so much data to pull reliable periods out. Thanks for observing the 
>> HMXBs!
>>
>> Gord (SGE)
>>
>> Keith Graham wrote:
>>> Hi Tim,
>>>
>>> Nice to see another HMXB campaign. Can we be assurred this time that 
>>> the comps are NOT VARIABLE :).
>>>
>>> Cheers,
>>>
>>> Keith
>>>
>>>
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