Molecules in deep sky objects/interstellar space ?

Molecules in deep sky objects/interstellar space ?

Postby Robin Leadbeater » Fri Oct 11, 2019 2:08 pm

Molecules are detectable in cool stars, comets, gas planets by amateurs of course but the question came up in another forum as to whether amateurs are able to detect molecules in deep sky objects or the interstellar medium. Does anyone know of such measurements? Are there any molecular spectral signatures from these sources within the range of CCD/CMOS technology ?

Cheers
Robin
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Re: Molecules in deep sky objects/interstellar space ?

Postby Andrew Smith » Sat Oct 12, 2019 1:29 pm

Not sure if this counts but you get absorption due to interstellar sodium in the spectra of some stars e.g. Rho Cas which I have captured.
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Re: Molecules in deep sky objects/interstellar space ?

Postby Andrew Smith » Sat Oct 12, 2019 2:32 pm

Just scanned "Physics of the interstellar and intergalactic medium" which did not turn up anything obvious. The ones which might have been in the visible are also in our atmosphere and show as the teluric lines!

Maybe others know better

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Re: Molecules in deep sky objects/interstellar space ?

Postby Robin Leadbeater » Sat Oct 12, 2019 4:42 pm

Hi Andrew,
Andrew Smith wrote:Not sure if this counts but you get absorption due to interstellar sodium in the spectra of some stars e.g. Rho Cas which I have captured.
Regards Andrew


I remember the IS lines from NA (and K) being really annoying when I was trying to measure these lines during Eps Aur eclipse. Not molecular though so no prize I am afraid :(
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Re: Molecules in deep sky objects/interstellar space ?

Postby Robin Leadbeater » Sat Oct 12, 2019 4:58 pm

There is also an interesting comprehensive list of inter/circumstellar molecules on Wikipedia.
https://en.wikipedia.org/wiki/List_of_i ... _molecules
Though likely none detectable from the ground at visible wavelengths

Robin
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Re: Molecules in deep sky objects/interstellar space ?

Postby Benjamin Mauclaire » Sat Oct 12, 2019 9:47 pm

Hi,

I confirm Robin's story about Na line from ISM. It's a pitty.
In my last paper about RR Lyr dynamics (https://ui.adsabs.harvard.edu/abs/2019A%26A...623A.109G, sec. 4), we first thought that Na line doubling came from Schwarzschild phenomenon (describing pulsation), but the reddish Na I line keep a steedy wavelength.
Although, the fact that Na reddish FWHM line was about 9 kms whicch is consistent with the ISM gas at high resolution.
We confirmed such hypothesis by looking for exsiting ISM bubble and loop between Earth and RR Lyr star in dedicated papers. Such reaserch domain is far from stellar astrophysics and is really an other world! Believe me, Univers is complex.

Benji
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Re: Molecules in deep sky objects/interstellar space ?

Postby Benjamin Mauclaire » Sun Oct 13, 2019 10:29 am

Re.

Be careful that each line of sight has to be studied with dedicated bibliographic research.
Milky way is complex.

Benji
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