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#11
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#13
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Where does Betelgeuse fit into this? It looks as red as a ruby as I look up at Orion during my early A.M. strolls. Double-A B-V=1.5, so pretty orange, but not red. Tom |
#14
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(Tom Polakis) wrote in message
D. None of these. TX Piscium is in second place. CE Tauri is the fourth reddest star, if by "reddest" you mean has the largest B-V value. Here's the listing by Hipparcos catalogue number: HIP V B-V 52009 4.89 2.800 117245 4.95 2.508 107259 4.22 2.242 25945 4.32 2.060 HIP 52009 = U Hydrae -- the reddest star brighter than V=5 HIP 117245 = TX Piscium -- the second reddest brighter than V=5 HIP 25945 = CE Tauri -- the fourth reddest brighter than V=5 (still very red) I'm too tired or lazy to bother with the other three questions. Tom I need to clarify and perhaps re-phrase my analytical ranking of CE Tauri as the *second* reddest star above magnitude 5. It's an optimisation between *colour index* AND *brightness*. Yes TX Piscium is redder, but have a look at its light curve over 5 years:- http://www.aavso.org/cgi-bin/superst...i=on &ccdu=on It spends most of its life well below magnitude 5. Also, carbon stars are known to vary their redness in line with intrinsic brightness, appearing redder at the *fainter* ends of their cycles. Pulsating red M-type supergiants like Mu Cephei, CE Tauri, Antares, Betelgeuse are in a different class altogether. Generally speaking, *the* reddest naked eye star in the entire night sky is undisputedly the Garnet Star in Cepheus (color index +2.35, spectrum M2 Ia). The *second* reddest star in the entire night sky is CE Tauri (color index +2.07, spectrum M2 Ib)... "The Ruby Star" as I note here in my Red Stars Catalog:- http://uk.geocities.com/aa_spaceagen...r_catalog.html Is the star that I look at night after night, through telescope after telescope, binocular after binocular... all the way through winter evenings! When I'm cold, it's warm, red colour draws me like... the eyes of count dracula!!! Abdul |
#15
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(SaberScorpX) wrote in message
I'm actually quite surprised that no one has been singing [CE Tauri's] praises, or even vaguely being aware of it as *the*second reddest naked eye star, as its virtually as red as the famousGarnet Star. Not to burst your bubble, but CE Tauri (aka HD 36389, HR 1845, 119 Tau) has been exhaustively studied for at least the last 25 years: http://www.konkoly.hu/cgi-bin/IBVS?4629 Oh absolutely, those researchers deserve tremendous credit for their work, and the star has been observed since pre-historic times, let's not kid ourselves here (AAI!)... But, if you look at their research thesis, these guys are treating this little gem as if it were some *obscure*, *insignificant*, piece of ... glowing gas shining at magnitude 12 in some far flung obscure corner of a dead constellation like Volans... Why is there just *one* research article on this star? It should be featured "star of the season" every winter... /joke Where's the acknowledgement of it being a star of *SUPREME* quality and redness. Where's their comparison to the Garnet Star, saying the differences in redness are virtually unnoticeable?! I hereby re-encourage all amateurs, the "Ruby Star" is worth a STRONG look through all instruments in winter stargazing! Pretty sure you're the first to give it a colorful nickname, though. SSX |
#16
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#17
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Where's the acknowledgement of it being a star of *SUPREME* quality
and redness? I hereby re-encourage all amateurs, the "Ruby Star" is worth a STRONG look through all instruments in winter stargazing! Gotta admit, for as bright and red as it is, CE Tauri is a relatively unsung star no matter what it's 'rank'. It doesn't make alot of red-star lists. Perhaps because it's not a 'true' red Carbon star (but neither is MuCep), and it's overshadowed by orange-red M-class dignitaries like Antares, Aldeberan, and Betelgeuse. How 'bout the 'Rodney Dangerfield of Red Stars' ? SSX |
#18
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Gotta admit, for as bright and red as it is, CE Tauri is a relatively
unsungstar no matter what it's 'rank'. It doesn't make alot of red-star lists. Perhaps because it's not a 'true' redCarbon star (but neither is MuCep), and it's overshadowed by orange-redM-class dignitaries like Antares, Aldeberan, and Betelgeuse. (Sorry. Aldeberan is a 'K' as is Arcturus. But some Ks overlap into the M-class. Picky, picky, picky...) SSX |
#19
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(AA Institute) wrote
I need to clarify and perhaps re-phrase my analytical ranking of CE Tauri as the *second* reddest star above magnitude 5. It's an optimisation between *colour index* AND *brightness*. Yes TX Piscium is redder, but have a look at its light curve over 5 years:- http://www.aavso.org/cgi-bin/superst...i=on &ccdu=on It spends most of its life well below magnitude 5. Also, carbon stars are known to vary their redness in line with intrinsic brightness, appearing redder at the *fainter* ends of their cycles. Pulsating red M-type supergiants like Mu Cephei, CE Tauri, Antares, Betelgeuse are in a different class altogether. Generally speaking, *the* reddest naked eye star in the entire night sky is undisputedly the Garnet Star in Cepheus (color index +2.35, spectrum M2 Ia). The *second* reddest star in the entire night sky is CE Tauri (color index +2.07, spectrum M2 Ib)... "The Ruby Star" as I note here in my Red Stars Catalog:- http://uk.geocities.com/aa_spaceagen...r_catalog.html Is the star that I look at night after night, through telescope after telescope, binocular after binocular... all the way through winter evenings! When I'm cold, it's warm, red colour draws me like... the eyes of count dracula!!! Okay, it you eliminate highly variable stars, then your "Ruby Star" is clearly second place. Tom (really hoping not to provoke another sophomoric poem by "Brilliant One") |
#20
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Paul Lawler wrote in message . 125.201...
(AA Institute) wrote in Where's the acknowledgement of it being a star of *SUPREME* quality and redness. Where's their comparison to the Garnet Star, saying the differences in redness are virtually unnoticeable?! I hereby re-encourage all amateurs, the "Ruby Star" is worth a STRONG look through all instruments in winter stargazing! Sorry my vote for featured star of exqisite redness in the winter has to go to R Leporis. Ah, "The Crimson Star" named by Russel Hind back in the old days. Now we're talking! I will be getting my first look at this one this coming winter. I never knew stars could be so red until "Ruby Star" caught my eye last April. the summer my vote goes to V Aquilae. I have seen this one, it's a beauty and a half... AAI |
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