[Aavso-photometry] [AAVSO-DIS] Close stars and aperture photometry

[Michael Newberry]

Absolutely, you're right, it is. But rather than doing PSF fitting for the 
star being measured, the tool is used for removing stars using the template. 
It is called "star editing".

Michael

----- Original Message ----- 
From: "Doug Welch" <welch at physics.mcmaster.ca>
To: <aavso-discussion at mira.aavso.org>
Sent: Friday, January 18, 2008 4:21 PM
Subject: Re: [AAVSO-DIS] Close stars and aperture photometry


>
> Michael,
>
> This sounds like PSF fitting to me!
>
> Cheers,
> Doug
>
> Michael Newberry wrote:
>> Hi Michael and Nicola,
>>
>> In addition to PSF fitting, there's another way. By coincidence, we've 
>> been
>> developing a Star Removal module for Mira, which is almost ready. There's
>> also one in IRAF---it's been some years since I used it, I think it is
>> called SEdit, or something like that. The way this method works is that 
>> the
>> software creates a template of the star profile and then uses it to 
>> subtract
>> the overlapping star(s) from the image. Then you can measure the target
>> object without any confusion.
>>
>> Michael Newberry
>>
>> ----- Original Message ----- 
>> From: "Michael Koppelman" <lolife at bitstream.net>
>> To: "Nicola Montecchiari" <superpolaris at gmail.com>
>> Cc: <aavso-discussion at mira.aavso.org>
>> Sent: Friday, January 18, 2008 12:29 PM
>> Subject: Re: [AAVSO-DIS] Close stars and aperture photometry
>>
>>
>>> Yes. You need to do PSF photometry if you want to untangle stars that
>>> are blended.
>>>
>>> M.
>>>
>>>
>>> On Jan 18, 2008, at 11:44 AM, Nicola Montecchiari wrote:
>>>
>>>> Let's say we have two stars Aand B and the ring of an aperture
>>>> photometry of star A overlaps the gaussian shape of star B and that I
>>>> can not have a smaller ring. Is this going to invalidate the measure?
>>>> I think so, but would like to know for sure.
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>>
>>
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