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#1
October 2nd 04, 12:07 AM
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Astronomy Quiz ! ! !
Listen up, you may win a prize if you get this right!!!
Question 1: ------------ What is the *second* *reddest* star in the entire night sky to shine above fifth magnitude? Is it:- A. Mu Cephei (William Herschel's "Garnet Star") B. The variable star CE Tauri C. The red supergiant Antares D. None of these Question 2: ------------- Who was the *FIRST* to identify the *second* *reddest* star mentioned in question 1 above? Was it:- A. The English astronomer John Goodricke in 1775 B. Mullah Omar (the notorius Taliban leader in Afghanistan) C. Sir Patrick Moore D. Abdul Ahad of the AA Institute Question 3: ------------- Does anyone have any plans to observe the variability of the star mentioned in Question 1 above, in the current season? Clue: The star is just rising in the late evenings! All answers invited!!! AAI 
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#2
October 2nd 04, 11:49 AM
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#4
October 4th 04, 01:04 AM
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(AA Institute) wrote in message . com...
(Double-A) wrote in message . com... (AA Institute) wrote in message . com... Listen up, you may win a prize if you get this right!!! Question 1: ------------ What is the *second* *reddest* star in the entire night sky to shine above fifth magnitude? Is it:- A. Mu Cephei (William Herschel's "Garnet Star") B. The variable star CE Tauri C. The red supergiant Antares D. None of these Answer: D No, have another go. By "above fifth magnitude" do you mean = 4, or = 6? Double-A
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#5
October 4th 04, 08:23 AM
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(Double-A) wrote in message . com...
(AA Institute) wrote in message . com... (Double-A) wrote in message . com... (AA Institute) wrote in message . com... Listen up, you may win a prize if you get this right!!! Question 1: ------------ What is the *second* *reddest* star in the entire night sky to shine above fifth magnitude? Is it:- A. Mu Cephei (William Herschel's "Garnet Star") B. The variable star CE Tauri C. The red supergiant Antares D. None of these Answer: D No, have another go. By "above fifth magnitude" do you mean = 4, or = 6? I mean 5 ... brighter than magnitude 5...
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#6
October 4th 04, 11:59 PM
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#7
October 5th 04, 05:42 AM
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(Tom Polakis) wrote in message om...
(AA Institute) wrote in message . com... Listen up, you may win a prize if you get this right!!! Question 1: ------------ What is the *second* *reddest* star in the entire night sky to shine above fifth magnitude? Is it:- A. Mu Cephei (William Herschel's "Garnet Star") B. The variable star CE Tauri C. The red supergiant Antares D. None of these 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 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
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#8
October 5th 04, 06:29 AM
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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
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#9
October 5th 04, 09:05 AM
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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
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#10
October 5th 04, 06:29 PM
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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")
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