Talk:Stellar classification: Difference between revisions
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Participate in the deletion discussion at the [[commons:Commons:Deletion requests/File:UY Scuti zoomed in, Rutherford Observatory, 07 September 2014.jpeg|nomination page]]. —[[User:Community Tech bot|Community Tech bot]] ([[User talk:Community Tech bot|talk]]) 14:07, 4 May 2020 (UTC) |
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== Canopus listed as an F-type supergiant == |
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On the section for Class F, Canopus is listed on the right as a Class F supergiant, isn't it really a class A? |
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:The spectrum of Canopus has traditionally been classified as F0 Iab or something similar. In 1989, a refinement of the traditional methods for determining the luminosity classes of "early F-type stars" resulted in the subtly different spectral type of A9II. This is now accepted as a better type although you'll still often see the old one. [[User:Lithopsian|Lithopsian]] ([[User talk:Lithopsian|talk]]) 16:52, 22 December 2020 (UTC) |
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== Magnetic O stars == |
== Magnetic O stars == |
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The printed version of the Magnetic O stars is very confusing because There is a ? Symbol which doesn’t make sense <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/98.47.226.110|98.47.226.110]] ([[User talk:98.47.226.110#top|talk]]) 03:10, 6 April 2022 (UTC)</small> <!--Autosigned by SineBot--> |
The printed version of the Magnetic O stars is very confusing because There is a ? Symbol which doesn’t make sense <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/98.47.226.110|98.47.226.110]] ([[User talk:98.47.226.110#top|talk]]) 03:10, 6 April 2022 (UTC)</small> <!--Autosigned by SineBot--> |
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:The question mark is intentional. It is the symbol indicating this particular spectral peculiarity, although you don't see it very often. Not a good choice IMO, but not many good symbols left. [[User:Lithopsian|Lithopsian]] ([[User talk:Lithopsian|talk]]) 10:38, 6 April 2022 (UTC) |
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== Percentages don't add up == |
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In the table of proportion of main sequence stars by spectral class, the percentages don't add up to rather more than 100%! [[User:GhostDancer|Steve]] ([[User talk:GhostDancer|talk]]) 14:47, 8 June 2023 (UTC) |
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:The numbers are calculated from table 2 in the given reference based on the total number of stars in each class compared to the total column. However, the number of stars in each class don't add up to the total 800. I rebased the proportions on the actual total of 824 (and a fraction). I'll expand the explanatory note to cover this. There are some other sources that could be used (eg [http://www.atlasoftheuniverse.com/startype.html]), but I haven't found a peer-reviewed one. The numbers don't end up radically different, and they actually vary quite a lot depending on how the sample is chosen. [[User:Lithopsian|Lithopsian]] ([[User talk:Lithopsian|talk]]) 15:54, 8 June 2023 (UTC) |
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== Diagram == |
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The classification table is wrong by a mile! According to it, [[Kepler-186]] is ~K8, [[AU Microscopii]] is K9 or M0, [[Canopus]] is F0, [[2MASS J0523−1403|2-MASS J0523-1403]] is a brown dwarf, and [[Kepler-442]] is ~M1 by radius. Please fix! [[User:Jtadesse|Jtadesse]] ([[User talk:Jtadesse|talk]]) 17:29, 28 November 2023 (UTC) |
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== LBV == |
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LBV is sometimes treated as a spectral type. Should it be added? [[User:Diamantinasaurus|Diamantinasaurus]] ([[User talk:Diamantinasaurus|talk]]) 12:39, 28 September 2024 (UTC) |
Latest revision as of 12:39, 28 September 2024
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Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 10:11, 17 January 2022 (UTC)
Magnetic O stars
[edit]The printed version of the Magnetic O stars is very confusing because There is a ? Symbol which doesn’t make sense — Preceding unsigned comment added by 98.47.226.110 (talk) 03:10, 6 April 2022 (UTC)
- The question mark is intentional. It is the symbol indicating this particular spectral peculiarity, although you don't see it very often. Not a good choice IMO, but not many good symbols left. Lithopsian (talk) 10:38, 6 April 2022 (UTC)
Percentages don't add up
[edit]In the table of proportion of main sequence stars by spectral class, the percentages don't add up to rather more than 100%! Steve (talk) 14:47, 8 June 2023 (UTC)
- The numbers are calculated from table 2 in the given reference based on the total number of stars in each class compared to the total column. However, the number of stars in each class don't add up to the total 800. I rebased the proportions on the actual total of 824 (and a fraction). I'll expand the explanatory note to cover this. There are some other sources that could be used (eg [1]), but I haven't found a peer-reviewed one. The numbers don't end up radically different, and they actually vary quite a lot depending on how the sample is chosen. Lithopsian (talk) 15:54, 8 June 2023 (UTC)
Diagram
[edit]The classification table is wrong by a mile! According to it, Kepler-186 is ~K8, AU Microscopii is K9 or M0, Canopus is F0, 2-MASS J0523-1403 is a brown dwarf, and Kepler-442 is ~M1 by radius. Please fix! Jtadesse (talk) 17:29, 28 November 2023 (UTC)
LBV
[edit]LBV is sometimes treated as a spectral type. Should it be added? Diamantinasaurus (talk) 12:39, 28 September 2024 (UTC)
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