Non Carbon Stars

3 months 1 week ago - 3 months 1 week ago #109082 by flt158
Non Carbon Stars was created by flt158
Hello, everyone.

Repentance is a very often a difficult thing to do.
But it's my turn to practice it on this occasion 

Thankfully there are only 6 non carbon stars which I have had to delete from my private list. They are:

1. SAO 106516 in Delphinus. Spectral class: K0.

2. TYC 3471-762-1 in Bootes. Spectral class: K0 or G8.

3. TYC 3686-796-1 in Bootes. Spectral class: N/A.

4. TYC 3483-1327-1 in Bootes: Spectral class: M6.

5. V Cancri: Spectral class: S0 to S7.

6. IY Comae Berenices. Spectral class: K9 to M2.

It just means that I have observed 85 carbon stars since December 2000.
I would imagine I will make it to 100 carbons in 2021.

So I apologise for all the hassle I have been doing over recent times.

If anyone has anything to say, you are most welcome to do so.

It just seems that there is a lot of unreliable information going around astronomical websites these days.

Just because a particular star is strong orange, it does not mean it is a carbon star.

Clear skies to all from Aubrey.
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3 months 1 week ago #109084 by lunartic
Replied by lunartic on topic Non Carbon Stars
I have observed some carbon stars and I have noticed that plenty of them are orange. I had expected them to be red in colour and when I saw the colour I believed that I was mistaken.
I have worked off a list of carbon stars from the Astronomical League and I had no reason to believe the list is incorrect.
We're these stars on a list, Aubrey?

Paul

Programming today is a race between software engineers striving to build bigger and better programs, and the universe trying to produce bigger and better idiots. So far, the universe is winning.

Rich Cook
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3 months 1 week ago #109085 by flt158
Replied by flt158 on topic Non Carbon Stars
Hi Paul.
I can safely say that website - the Astronomical League - are all correct. Thank goodness!

It's Simbad that is the problem.
Recently I was working through its list of carbon stars, and more than twice there was a blank AladinLight image.
It's as if the carbon star is completely invisible!
It's very important to check the spectral classes of any star before we figure out it is a carbon star or not.
If a certain star has a spec. class of C, R or N then it can probably be accepted as a carbon star.
The AAVSO website only includes variable carbon stars. But what does bother me is that they don't appear to include carbon stars which are not variable.
Therefore each carbon star must be checked out individually from all sources.

I'm just now noticing now that the Astronomical League does include SAO 106516 as a carbon star with a sp. class of C1 or R0. So I had better do some more homework on that star. It may be that the star has some carbon in it after all. Simbad gives C- H3. Whatever that means. Guide 9.1 DVD gives K0 first. Then gives R. This drives me mad! There must be so many spectroscopists giving different interpretations which has the rest of us thoroughly confused.

However having said all that, I will add SAO 106516 to my list once again. The star doesn't appear on AAVSO because its magnitude does not vary. Maddening!

Best regards, Paul.

Aubrey.
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3 months 1 week ago #109086 by lunartic
Replied by lunartic on topic Non Carbon Stars
One would have thought that these details would be checked and checked again before publication.  It makes those involved look like they have not done their research.

Paul

Programming today is a race between software engineers striving to build bigger and better programs, and the universe trying to produce bigger and better idiots. So far, the universe is winning.

Rich Cook
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3 months 1 week ago #109087 by flt158
Replied by flt158 on topic Non Carbon Stars
Precisely, Paul.

What complicates things further is that some S class stars have very rich orange hues. That's why I have been considering such stars like V Cancri as carbon stars. How nasty!

About a year ago, 2 spectroscopists were arguing over 35 B Cassiopeiae over on www.cloudynights.com . One was saying that the star was M2. But the other man said it was K4. Thankfully the 2nd man won. And the 1st man accepted the 2nd man's judgement because his equipment was more comprehensive. Both men had produced those line graphs.
It appears that some people buy hugely expensive equipment to get the correct results. And others don't upgrade at all.

So as things stand I can say I have observed 86 carbon stars. Onwards and upwards.

Kind regards from Aubrey.
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3 months 6 days ago #109091 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Non Carbon Stars
Hi Gents, 

Fascinating reading through this thread. Glad to read that you managed to regain one of your Carbon stars Aubrey. So, only 14 to go! 

It seems that there is plenty of conflicting information flying around to keep us all on our toes. 

Sure, what else would be doing with all these pesky clouds? 

Clear skies, 

Darren. 
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