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Thread: Would You Like To See Some Red!

  1. #1
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    Default Would You Like To See Some Red!



    I was out last night because it was finally clear from dusk to dawn. I've been waiting for a night like this for nearly 5 months.

    One of the items on my observing list was R Leporis. R Leporis aka Hind's Crimson Star is as the name suggests a very, very red star! This got me to thinking about finding other carbon stars. Here is a brief intro into carbon stars:
    Nearly all carbon stars are red giants that have run out of hydrogen fuel in their cores. As the hydrogen became sparse, the core of the star compressed and grew much hotter, hot enough to start the process of nuclear fusion of helium into carbon and oxygen. The hotter core causes the star’s outer layers to expand, and within these layers form convective currents that dredge up carbon and oxygen into the star’s outer layers like bubbles churning in a pot of stew. In the cool outer layers of the star, carbon and oxygen atoms combine to form small molecules like C2, CH, and even SiC2. This material scatters blue light from inside the star and passes red light unscathed resulting in an enhancement of the star’s already reddish-color. This is the same process that reddens the sky during a sunrise or sunset in our sky.

    Red giant stars are common, but carbon stars are much less so because the mechanism the produces them lasts for a relatively short span in the star’s late life. Carbon stars are also highly variable. Their brightness can change by many magnitudes over the course of hundreds of days. At peak brightness, many such stars are visible even in binoculars. At their lowest, they fade to near invisibility in small optics. The apparent ‘redness’ of the stars also varies with brightness and tends to be most pronounced in the middle to lower range of their brightness.
    So I've compiled a couple of links that list these carbon stars for you to use as a basis to construct your own carbon star observing list. Here they are:
    https://www.dropbox.com/s/zvicn2phna...List3.pdf?dl=0
    https://www.dropbox.com/s/x63q2ndkxq...0List.xls?dl=0

    This last list is directly importable into Sky Safari (I've already done this and it works).
    http://www.vanzella.com/Carbon%20Sta...20List.skylist

    Cheers,
    JT
    Last edited by jaetea; 01-08-2019 at 09:17 AM.
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  2. The Following 5 Users Say Thank You to jaetea For This Useful Post:

    bobharmony (01-08-2019),greqmaa (01-08-2019),ic_1101 (01-09-2019),sketrip (01-08-2019),SpyderwerX (01-08-2019)

  3. #2
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    Default Re: Would You Like To See Some Red!

    Many thanks for the links JT.
    Having them import directly to SS is a added bonus!


    My favourite red star is DY Crucis, a variable 8th magnitude star in the constellation Crux, it sits next to Becrux. Beautiful deep dark red!

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    Default Re: Would You Like To See Some Red!

    Quote Originally Posted by kingclinton View Post
    My favourite red star is DY Crucis, a variable 8th magnitude star in the constellation Crux, it sits next to Becrux. Beautiful deep dark red!
    I'll be looking for that one when it becomes visible in my sky. I get a very short run of Crucis here at my latitude.

    Thanks and cheers,
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    Default Re: Would You Like To See Some Red!

    Quote Originally Posted by jaetea View Post
    I'll be looking for that one when it becomes visible in my sky. I get a very short run of Crucis here at my latitude.

    Thanks and cheers,
    JT
    Crux is climbing higher each night and in a month or so should be a easy early evening target.
    Good luck! I look forward to hearing what you think of this beautiful red star.
    Last edited by kingclinton; 01-09-2019 at 04:47 AM.
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    Default Re: Would You Like To See Some Red!

    Thanks cor those lists JT.

    I use SS5 Pro, can someone tell me how to import the list please.

    Edit: never mind, I found it.
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    Default Re: Would You Like To See Some Red!

    Quote Originally Posted by bikerdib View Post
    Edit: never mind, I found it.
    I love it when people find the answers to their own questions.

    Appreciatively,
    JT
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    Default Re: Would You Like To See Some Red!

    I've only recently decided to try to locate and view carbon stars. Thanks for the lists!

 

 

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