Celestia Forums

Hi everyone,

i finally found time to update my STC-Guide a bit.
It is now ?more or less up to date for the 1.4.0pre6 version. If anyone finds missing information or bugs or wrong descriptions, tell me.
You can download it here: http://home.arcor.de/christianlenz/Down ... r1.4.0.pdf
The final version will then again be uploaded to the motherlode, as usual.

Regards,

Guckytos

T: T Tauri stars, very young and low density stars.
Temperatures ~1,000 K
Class T stars are very young and low density stars often found in the interstellar clouds they were born in. The gravitational contraction is still in process and they are barely big enough to be stars. T Tauri stars are in a transitional phase between being proto-stars and stars arriving at the main sequence. On a Hertzsprung-Russell Diagram, they plot above the main sequence. They appear black, emitting little or no visible light but being strongest in infrared. Complex molecules can form, evidenced by the strong methane lines in their spectra.

I don't think this description is correct (at least, not officially). As far as I know The T spectral type is reserved for cool brown dwarfs (technically not stars) with temperatures below 1000K (the L type is for warmer brown dwarfs).

I don't think it's used for T Tauri stars at all, but I may be wrong there.

Dear Evil Dr,

i found this info on some webpages in more or less the same form. I know that you can't always trust the information found on the net, but they seemed decent enough and were all about astronomy.
So, if you you can point me to an official declaration/description of what T Tauri stars really are, i will think about changing the text.
On the other hand i think that it should become clear from the text that T Tauri stars are not really stars, yet.

But i you didn't find a moreserious error, i am glad.

If anyone has a more extensive description of the subclasses of white dwarfs, i could use it.

Regards,

Guckytos

See these pages for details of L and T dwarfs:
http://www-int.stsci.edu/~inr/ldwarf1.html
http://spider.ipac.caltech.edu/staff/da ... rison.html

See this about T Tauri stars:
http://zebu.uoregon.edu/~imamura/208/feb15/tauri.html
http://www.astro.up.pt/users/dfmf/Thesi ... node5.html

T Tauri stars, like other protostars, don't appear to have a spectral type/class definition.

Christian,

Just wanted to say THANK YOU for the updated version of the
STC Guide. For us less-gifted individuals, your guide is
very easy to follow, to understand and to use.

Muchly appreciated...

Thanks, Bob

Thanks for the appreciation Bob!

But most of the stuff i added is just more or less copy and paste from Adirondacks work. Whom i wanted to thank for giving me his "raw" data.

I am glad it is easy to understand and follow. It is always the problem with stuff like this on how much to pack into it, without loosing the goal out of sight.

Thanks Evil Dr for the links. I will have a better look at them after the Christmas hollidays. Btw, i will be offline for the next couple of weeks, visiting my parents --> no PC and absolutely no net!!

Unbelievable, but true!

So all of you have a nice Christmas and a Happy New Year.

Regards,

Guckytos