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#1
July 13th 04, 03:21 PM
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Cygnus X-1: Case for a Black Hole?
This is a popular summer question no doubt...
Now that Cygnus is getting higher in the evening skies, I was going to have my first look at the star HD 226868 which is the visible blue supergiant being pulled apart by its invisible 'suspected' black hole binary companion. This is the scenario I read a few years back, does the latest thinking and research (post-Hubble Space Telescope findings) still support the view that this star and its associated x-ray emmissions are a strong candidate for a possible black hole? Further, if the black hole *is* continually sucking material out of the (visible) blue supergiant star, has any notable dimming of the star been noted since discovery of the system a few decades back? I assume a significant loss of star-mass would give rise to a measurable reduction in intrinsic luminosity... is this a fair assumption over a comparatively short space of time in the star's overall life span? BTW - if anyone wants to have a look for this star, I’ve spotted a finder chart he- http://www.skyhound.com/sh/archive/aug1/V1674_Cyg.html AAI ================================================== == http://uk.geocities.com/aa_spaceagent/astronomy.html ================================================== == 
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#2
July 13th 04, 03:34 PM
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AA Institute wrote:
This is a popular summer question no doubt... Now that Cygnus is getting higher in the evening skies, I was going to have my first look at the star HD 226868 which is the visible blue supergiant being pulled apart by its invisible 'suspected' black hole binary companion. This is the scenario I read a few years back, does the latest thinking and research (post-Hubble Space Telescope findings) still support the view that this star and its associated x-ray emmissions are a strong candidate for a possible black hole? Further, if the black hole *is* continually sucking material out of the (visible) blue supergiant star, has any notable dimming of the star been noted since discovery of the system a few decades back? I assume a significant loss of star-mass would give rise to a measurable reduction in intrinsic luminosity... is this a fair assumption over a comparatively short space of time in the star's overall life span? BTW - if anyone wants to have a look for this star, I’ve spotted a finder chart he- http://www.skyhound.com/sh/archive/aug1/V1674_Cyg.html AAI ================================================== == http://uk.geocities.com/aa_spaceagent/astronomy.html ================================================== == More http://www.google.com/search?q=HD+22...te%3AarXiv.org http://simbad.u-strasbg.fr/sim-id.pl...dent=HD+226868
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#3
July 13th 04, 03:34 PM
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AA Institute wrote:
This is a popular summer question no doubt... Now that Cygnus is getting higher in the evening skies, I was going to have my first look at the star HD 226868 which is the visible blue supergiant being pulled apart by its invisible 'suspected' black hole binary companion. This is the scenario I read a few years back, does the latest thinking and research (post-Hubble Space Telescope findings) still support the view that this star and its associated x-ray emmissions are a strong candidate for a possible black hole? Further, if the black hole *is* continually sucking material out of the (visible) blue supergiant star, has any notable dimming of the star been noted since discovery of the system a few decades back? I assume a significant loss of star-mass would give rise to a measurable reduction in intrinsic luminosity... is this a fair assumption over a comparatively short space of time in the star's overall life span? BTW - if anyone wants to have a look for this star, I’ve spotted a finder chart he- http://www.skyhound.com/sh/archive/aug1/V1674_Cyg.html AAI ================================================== == http://uk.geocities.com/aa_spaceagent/astronomy.html ================================================== == More http://www.google.com/search?q=HD+22...te%3AarXiv.org http://simbad.u-strasbg.fr/sim-id.pl...dent=HD+226868
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#4
July 15th 04, 12:21 PM
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Sam Wormley wrote in message ...
AA Institute wrote: BTW - if anyone wants to have a look for this star, I’ve spotted a finder chart he- http://www.skyhound.com/sh/archive/aug1/V1674_Cyg.html AAI ================================================== == http://uk.geocities.com/aa_spaceagent/astronomy.html ================================================== == More http://www.google.com/search?q=HD+22...te%3AarXiv.org http://simbad.u-strasbg.fr/sim-id.pl...dent=HD+226868 You don't say much. do you Sam?! Abdul Ahad (also known as 'AA Institute' depending on the mood...)
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#5
July 15th 04, 12:21 PM
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Sam Wormley wrote in message ...
AA Institute wrote: BTW - if anyone wants to have a look for this star, I’ve spotted a finder chart he- http://www.skyhound.com/sh/archive/aug1/V1674_Cyg.html AAI ================================================== == http://uk.geocities.com/aa_spaceagent/astronomy.html ================================================== == More http://www.google.com/search?q=HD+22...te%3AarXiv.org http://simbad.u-strasbg.fr/sim-id.pl...dent=HD+226868 You don't say much. do you Sam?! Abdul Ahad (also known as 'AA Institute' depending on the mood...)
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