Talk:WR 25
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Great eruption in Carina Nebula
[edit]The article Carina Nebula says this star became much harder to see after 'the 1841 Great Ereuption' but doesn't explain what this was [properly. It isn't mentioned at all here. Was WR25 the brightest star in the sky? What did the 'Great eruption' lo0ok like and who observed it? — Preceding unsigned comment added by 79.74.23.38 (talk) 20:54, 1 April 2017 (UTC)
- I don't see the claim you're referring to, but in any case I suspect you've got the wrong star. See Eta Carinae. Lithopsian (talk) 18:23, 2 April 2017 (UTC)
Bad abs magnitude?
[edit]Article states that WR 25 is 2.4E6 times as luminous as the sun, and has absolute magnitude -7. But 2.4E6 <=> 16 magnitudes brighter (lower) than the sun’s +5 abs mag. That would be -11, not -7.
What gives? Error here? (For comparison, Deneb is listed as 2E5 times solar and -8 abs mag., which agrees with the magnitude scale.) Jmacwiki (talk) 06:10, 10 July 2022 (UTC)
- See bolometric luminosity. These are two different measurements. The absolute magnitude you quote is a visual absolute magnitude (MV) while the luminosity includes all wavelengths. WR25 is hot (very hot!) and emits a lot of UV - actually the majority of its electromagnetic radiation is at wavelengths shorter than the visual band. Lithopsian (talk) 13:07, 10 July 2022 (UTC)
- Excellent point. Jmacwiki (talk) 20:23, 29 January 2023 (UTC)
No Circle
[edit]The article says the star is circled in the photo but I see no circle.65.75.86.79 (talk) 11:19, 14 April 2023 (UTC)
- The circle is only visible in the thumb, not in the full-size image. This is a limitation of the mapping template. The circle doesn't exactly jump out, it is roughly three quarters of the way down, in the middle. Do you definitely not see it, even on the thumbnail? Lithopsian (talk) 13:37, 14 April 2023 (UTC)