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Talk:Hertzsprung–Russell diagram

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This is an old revision of this page, as edited by Soloist (talk | contribs) at 18:18, 18 October 2006 (a thought about HR diagrams andcolour magnitude plots). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

The text mentions "red giants" which doesn't appear as a label in the diagram. Just to avoid confusion, either the text or diagram should be changed (by someone who knows what they are doing). GreatWhiteNortherner 12:23, Jan 10, 2004 (UTC)

Hi User:Looxix! I have some questions about the diagram. Can you add some informations about the meaning of the numbers on both axis? What is the source of the data points? The statistical distribution on the sheet lets me assume, that this are manually and arbitrary distributed points and not actually existing stars. Is that correct? Is there anybody who knows how to get real data for instance from the Hipparcos satellite? I'm from the german WP, where this diagram is used as well. --Wolfgangbeyer 21:45, 8 Apr 2004 (UTC)

Someone should include where our Sun is on this diagram :) Indosauros 14:00, Jul 14, 2004 (UTC)

Mathematical Relationship?

The first sentence: "... Hertzsprung-Russell diagram shows the mathematical relationship between absolute magnitude, luminosity,..." is nonsense. There is no mathematical relationship between these quantities. As a matter of fact, the H-R-diagram doesn's show something like a perfect graph of a function, but a cloud of points. Therefore the diagram "only" shows physical relationships. --CWitte 10:05, 28 Jan 2005 (UTC)

Ladies get no respect?

So is it true that Annie Cannon and other women astronomers discovered this relationship and had the credit taken by Hertzsprung and Russel? (comment from anon 08:06, 2005 Feb 3)

On a first random check on the internet, it seems he made his diagram about five years earlier (1905 ) than she was working on the topic (1911->1914, same source) and that it's quite correct to credit the diagram to (independently both of) Hertzsprung and Russell, whilst the detailed classification based on it is being correctly attributed to Annie Cannon (again same source). Do you have any more deatail about this? In what way did they take her credit? Mozzerati 08:44, 2005 May 8 (UTC)

Great A'Tuin

I removed the following link on the grounds of utter irrelevancy. Gene Ward Smith 06:28, 10 October 2005 (UTC)[reply]

Distance

Could someone tell me how distance is calculated from the diagram.
Thank you! (Unsigned comment from User:JML)
I'm not experienced in the field, but I'd guess that since the colour and apparent magnitude are known, one can assume that the absolute magnitude is on the main sequence, and use the ratio of apparent to absolute magnitude to determine the distance. --Stoive 18:40, 23 September 2006 (UTC)[reply]

Names?

Could someone please add a chart of star names by size, instead of lumping them all into "supergiants" and "medium stars?" I mean all of the blue giant, red giant, red dwarf, etc.

Not a colour magnitude diagram

I am a professional astronomer and I always thought that a HR diagram and a colour magnitude plot were different things. Where a HR diagram uses Absolute magnitude (via knowledge of the distance) a colour mag diagram uses apparent magnitude (Where no distance is known). Though I am not sure if HR also pioneered this as well, I would say that its reference to colour is an indication that it was a plot that could be drawn from photometry alone, and hence useful to astronomers.Soloist 18:18, 18 October 2006 (UTC)[reply]

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