Re: Hawking and distance of stars

In article <00kat19ujo4qr16p2o39nmq86csqhegtvm@xxxxxxx>,
Pip R. Lagenta <morbiusatwork@xxxxxxxxxxx> wrote:
>On 23 Jan 2006 12:00:37 -0800, "Lee Jay" <ljfinger@xxxxxxx> wrote:
>>Ernest Major wrote:
>>> How many different ways are there of measuring the distance to stars.
>>> Off the top of my head, there's
>>>
>>> 1) trigonometric parallax
>>> 2) cluster parallax
>>> 3) spectrographic "parallax"
>>> 4) period-luminosity relationships for various classes of variable stars
>>> 5) trigonometric measures from light echos from e.g. SN1987A.
>>> 6) apparent diameters of HII etc regions (the actual diameter depends on
>>> the luminosity of the exciting star, which can be inferred from the
>>> spectral type).
>>> 7) apparent diameters of planetary nebula
>>> 8) apparent diameters of stars
>>>
>>> Any more?
>>
>>http://www.astro.ucla.edu/~wright/distance.htm
>
>That site has twenty-six different ways listed of measuring the
>distance to stars. They label them "A" through "Z". If a
>twenty-seventh method is invented, that web site is SCREWED!

26 Ways to Measure Your Stellar Distances
-----------------------------------------

The problem is all out there is space
She said to me
The answer is easy if you
Use trigonometry
I'd like to help you in your struggle
To get a PhD
There must be twenty-six ways
To measure your stellar distances

CHORUS
Just use a Cepheid, Sid
Get the cluster parallax, Max
Fit to the main sequence, Terrence
Get a PhDeeeeeeeeee

Alan
--
Defendit numerus

.

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