Re: [APML] Going Deep on M27

["Richard Crisp" <rdcrisp@earthlink.net>]

----- Original Message ----- 
From: "Robert Gendler" <robgendler@worldnet.att.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, August 13, 2005 4:58 AM
Subject: Re: [APML] Going Deep on M27


> Thanks Richard. This is one of the few images that I've finished
> late at night that I still like in the morning <g>.


That is reminiscent of a line from a Willie Nelson tune:

"I went home at two with a ten and woke up at ten with a two"

I know exactly what you mean about processing late at night thinking I've 
made the end all be all image and it looks terrible in the morning.

Yours is a magnificent m27.

rdc


> Rob Gendler
> email: robgendler@att.net
> Web Site: http://www.robgendlerastropics.com
> ----- Original Message ----- 
> From: "Richard Crisp" <rdcrisp@earthlink.net>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Saturday, August 13, 2005 1:41 AM
> Subject: Re: [APML] Going Deep on M27
>
>
>> that's hot, Rob, really hot!
>>
>> I like it a lot
>> rdc
>>
>>
>> ----- Original Message ----- 
>> From: "Robert Gendler" <robgendler@worldnet.att.net>
>> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>> Sent: Friday, August 12, 2005 6:43 PM
>> Subject: [APML] Going Deep on M27
>>
>>
>> > Hi all,
>> > Here's a deep image of M27 using recent data acquired
>> > from New Mexico and h-alpha data from connecticut.
>> > Some information on the M27 is below the image link.
>> > http://www.robgendlerastropics.com/M27NM.html
>> >
>> > M27 has the distinction of being the first planetary nebula ever
>> > discovered.
>> > Messier's description of it as an "oval nebula without stars" was
> followed
>> > by John Herschel's comparison to a dumbbell which later became its
> popular
>> > name. The brightest part of the nebula is about 6 arc minutes (2.4 
>> > light
>> > years) wide but a faint outer shell exists extending to 15 arc minutes.
>> > The
>> > nebula is apparently expanding at a rate of 6.8 arc seconds per 
>> > century.
>> > This value leads to a calculated age of 3000 to 4000 years. The central
>> > star
>> > is a white dwarf with a temperature of 85,000 degrees K. High energy
>> > radiation from the dead star is absorbed by the gases of the nebula and
>> > reemitted predominantly (about 90%) in green light at 500.7 nm due to
>> > ionized oxygen. Other less abundant elements also present in the
> expanding
>> > shell include hydrogen, helium, nitrogen and neon.
>> >
>> >
>> >
>> > Studies of M27 reveal a complex triple shell structure uncommon among
>> > planetary nebulae. The outermost shell has a very low surface 
>> > brightness
>> > and
>> > a complex structure. It is recorded well only through narrowband 
>> > filters
>> > and
>> > probably represents gases expelled during earlier mass ejection periods
> of
>> > the dying star. The elliptical shape of M27 is due to viewing the 
>> > nebula
>> > at
>> > its equatorial plane as most planetary nebulae have a cylindrical
> bilobed
>> > shape.
>> >
>> >
>> >
>> >
>> >
>> > Rob Gendler
>> > email: robgendler@att.net
>> > Web Site: http://www.robgendlerastropics.com
>> >
>> > _______________________________________________
>> > Astro-Photo mailing list
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>> > http://seds.org/mailman/listinfo/astro-photo
>> >
>>
>>
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