Star categories

"Robin Leadbeater" wrote in message
...
[snip]
You might find Jim Kaler's website interesting. Enter here for more infor
on
spectral classification

http://www.astro.uiuc.edu/~kaler/sow...a.html#classes

None of the references so far mention a type which I recall reading from
about 20 years ago: P with surface temps in excess of 50,000 degrees.

Does anyone know anything about this class? Why is it not included in most
classifications nowadays?

Thanks much in advance,

-
Robin Leadbeater
--
Ioannis --- http://ioannis.virtualcomposer2000.com/

Tom Hise wrote:

On 21 Jan 2006 10:33:23 -0800, "RMOLLISE" wrote:

Alas...the "RNS" designations have been superceded now (largely by
"C"). It's a shame, because I used to be able to teach my students the
mnemonic:

"Oh Be A Fine Girl, Kiss Me Right Now Smack."

Always being careful to _also_ tell them Miss Dorothy's favorite:

"Only Boys Accepting Feminism Get Kissed Meaningfully."

You can tell how long it's been since I took an astronomy class.

The mnemonic I learned from W. P. Bidelman was: "Oh Be A Fine Girl, Kiss Me
Right Now Sugar"

The version I read somewhere (something by Asimov, perhaps?) about
thirty years ago was similar, but included the designation for
Wolf-Rayet stars at the blue end: "Wow! Oh, Be A Fine Girl: Kiss Me
Right Now, Sweetheart."

--
Odysseus

"Odysseus" wrote in message
...
Tom Hise wrote:

On 21 Jan 2006 10:33:23 -0800, "RMOLLISE" wrote:

Alas...the "RNS" designations have been superceded now (largely by
"C"). It's a shame, because I used to be able to teach my students the
mnemonic:

"Oh Be A Fine Girl, Kiss Me Right Now Smack."

Always being careful to _also_ tell them Miss Dorothy's favorite:

"Only Boys Accepting Feminism Get Kissed Meaningfully."

You can tell how long it's been since I took an astronomy class.

The mnemonic I learned from W. P. Bidelman was: "Oh Be A Fine Girl, Kiss
Me
Right Now Sugar"

The version I read somewhere (something by Asimov, perhaps?) about
thirty years ago was similar, but included the designation for
Wolf-Rayet stars at the blue end: "Wow! Oh, Be A Fine Girl: Kiss Me
Right Now, Sweetheart."

--


I heard Oh, Be A Fine Girl & Kiss Me
Right Now & Suck

Ioannis wrote:
"Robin Leadbeater" wrote in message
...
[snip]
You might find Jim Kaler's website interesting. Enter here for more
infor on spectral classification

http://www.astro.uiuc.edu/~kaler/sow...a.html#classes

None of the references so far mention a type which I recall reading
from about 20 years ago: P with surface temps in excess of 50,000
degrees.

Does anyone know anything about this class? Why is it not included in
most classifications nowadays?

The only stars with a surface temperature over 50,000K are Wolf-Rayet stars.
Their class is noted W.
Never heard of a P class anywhere

--
Norbert. (no X for the answer)
======================================
knowing the universe - stellar and galaxies evolution
http://nrumiano.free.fr
images of the sky http://images.ciel.free.fr
======================================

On Sun, 22 Jan 2006 00:07:25 +0200, "Ioannis"
wrote:

"Robin Leadbeater" wrote in message
...
[snip]
You might find Jim Kaler's website interesting. Enter here for more infor
on
spectral classification

http://www.astro.uiuc.edu/~kaler/sow...a.html#classes

None of the references so far mention a type which I recall reading from
about 20 years ago: P with surface temps in excess of 50,000 degrees.

Does anyone know anything about this class? Why is it not included in most
classifications nowadays?

Possibly now included with O.

There's also p for peculiar: Ap, Bp, Fp.

William Hamblen wrote:
On Sun, 22 Jan 2006 00:07:25 +0200, "Ioannis"
wrote:

"Robin Leadbeater" wrote in message
...
[snip]
You might find Jim Kaler's website interesting. Enter here for more infor
on
spectral classification

http://www.astro.uiuc.edu/~kaler/sow...a.html#classes

None of the references so far mention a type which I recall reading from
about 20 years ago: P with surface temps in excess of 50,000 degrees.

Does anyone know anything about this class? Why is it not included in most
classifications nowadays?

Possibly now included with O.

There's also p for peculiar: Ap, Bp, Fp.

ISTR that this class was used for stars with strong winds, producing
emission lines with so-called P Cygni profiles. These all fit
more or less comfortably in the other bins by now (which is also
what happened to C,D,... from the original Harvard types).
The strongest examplesof the phenomenon blend into the WR stars,
and subtle example are among the Of stars.

Novae once had their own class (Q?).

Bill Keel