|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Can Life develop in the expanded habitable zones around Red Giant Stars?
More from astro-ph:
Paper: astro-ph/0503520 Date: Wed, 23 Mar 2005 22:46:20 GMT (58kb) Title: Can Life develop in the expanded habitable zones around Red Giant Stars? Authors: Bruno Lopez, Jean Schneider, William C. Danchi We present some new ideas about the possibility of life developing around sub-giant and red giant stars. Our study concerns the temporal evolution of the habitable zone. The distance between the star and the habitable zone, as well as its width, increases with time as a consequence of stellar evolution. The habitable zone moves outward after the star leaves the main sequence, sweeping a wider range of distances from the star until the star reaches the tip of the asymptotic giant branch. If life could form and evolve over time intervals from $5 \times 10^8$ to $10^9$ years, then there could be habitable planets with life around red giant stars. For a 1 M$_{\odot}$ star at the first stages of its post main-sequence evolution, the temporal transit of the habitable zone is estimated to be of several 10$^9$ years at 2 AU and around 10$^8$ years at 9 AU. Under these circumstances life could develop at distances in the range 2-9 AU in the environment of sub-giant or giant stars and in the far distant future in the environment of our own Solar System. After a star completes its first ascent along the Red Giant Branch and the He flash takes place, there is an additional stable period of quiescent He core burning during which there is another opportunity for life to develop. For a 1 M$_{\odot}$ star there is an additional $10^9$ years with a stable habitable zone in the region from 7 to 22 AU. Space astronomy missions, such as proposed for the Terrestrial Planet Finder (TPF) and Darwin should also consider the environments of sub-giants and red giant stars as potentially interesting sites for understanding the development of life. ( http://arXiv.org/abs/astro-ph/0503520 , 58kb) -- Lt. Lazio, HTML police | e-mail: No means no, stop rape. | http://patriot.net/%7Ejlazio/ sci.astro FAQ at http://sciastro.astronomy.net/sci.astro.html |
#2
|
|||
|
|||
Joseph Lazio wrote:
More from astro-ph: Paper: astro-ph/0503520 Date: Wed, 23 Mar 2005 22:46:20 GMT (58kb) Title: Can Life develop in the expanded habitable zones around Red Giant Stars? Authors: Bruno Lopez, Jean Schneider, William C. Danchi We present some new ideas about the possibility of life developing around sub-giant and red giant stars. Our study concerns the temporal evolution of the habitable zone. The distance between the star and the habitable zone, as well as its width, increases with time as a consequence of stellar evolution. The habitable zone moves outward after the star leaves the main sequence, sweeping a wider range of distances from the star until the star reaches the tip of the asymptotic giant branch. If life could form and evolve over time intervals from $5 \times 10^8$ to $10^9$ years, then there could be habitable planets with life around red giant stars. For a 1 M$_{\odot}$ star at the first stages of its post main-sequence evolution, the temporal transit of the habitable zone is estimated to be of several 10$^9$ years at 2 AU and around 10$^8$ years at 9 AU. Under these circumstances life could develop at distances in the range 2-9 AU in the environment of sub-giant or giant stars and in the far distant future in the environment of our own Solar System. After a star completes its first ascent along the Red Giant Branch and the He flash takes place, there is an additional stable period of quiescent He core burning during which there is another opportunity for life to develop. For a 1 M$_{\odot}$ star there is an additional $10^9$ years with a stable habitable zone in the region from 7 to 22 AU. Space astronomy missions, such as proposed for the Terrestrial Planet Finder (TPF) and Darwin should also consider the environments of sub-giants and red giant stars as potentially interesting sites for understanding the development of life. ( http://arXiv.org/abs/astro-ph/0503520 , 58kb) Very interesting! Great idea really. More and more scientists are seeing that life could be just about anywhere. The key to the whole argument is that about 5 * 10^8 to 10^9 years is all that may be needed for life to form. It would be great to confirm that ... to determine that what happened on Earth was just not some extremely rare accident ... |
#3
|
|||
|
|||
Sirius-b was once upon a time a very red-giant, thus likely a bit older
than our star and now having been taking it's UV-c and worse toll upon whomever and/or whatever managed to have survived that somewhat testy red-giant phase of an environment, though not entirely impossible for a Venus like planet, especially if made into orbiting and/or perhaps already coexisting about Sirius-a. Question; How much of a Kuiper/Oort zone of icy orbs is available to the Sirius star system? ~ This is your basic Hot Township, Bridge & Tarmac upon Venus: http://guthvenus.tripod.com/gv-town.htm China/Russian LSE-CM/ISS (Lunar Space Elevator) http://guthvenus.tripod.com/lunar-space-elevator.htm Venus life & a few other topics from Brad Guth / GASA-IEIS http://guthvenus.tripod.com/gv-topics.htm |
#4
|
|||
|
|||
Joseph Lazio and Alfred A. Aburto Jr.,
That's rather downright odd. Here I'd contributed as to the matter of astronomy fact that Sirius-b was likely if not astrophysics-101 required as once upon a time being a red-giant, and lo and behold, darn if it seems as though all of the topic lights went out. Why is that? or perhaps what's so gosh darn taboo/nondisclosure about the Sirius star system? http://www.solstation.com/stars/sirius2.htm Hunt for Sirius C and Substellar Companions According to Duchner and Brown (2000 preprint -- in postscript), three analyses of the proper motion of Sirius found a perturbation in the orbit of Sirius B with a period around six years (Ch. Volet, 1932; Walbaum and Duvent, 1983; and Benest and Duvent, 1995). The analyses did not resolve whether the perturbing body orbits Sirius A or B, although dynamical simulations suggest that stable orbits exist around both stars at circumstellar distances up to more than half the binary system's closest separation of 8.1 AUs (Daniel Benest, 1989). Because ancient astronomers believed that Sirius was red in color as late as 2,000 years ago, some investigators wonder if the system may have a third stellar component, Sirius C, with about five percent of Sol's mass that implies a spectral type M5-9 in a six-year elliptical orbit around Sirius A (Benest and Duvent, 1995). A recent search for faint companions using the Hubble Space Telescope found no supporting evidence for a large Jupiter or brown dwarf sized object, although the observed positions of Sirius AB -- Gl 244 AB -- differed from published orbital elements (Schroeder et al, 2000). http://www.tcnj.edu/~pfeiffer/AST261Chap3.html 4. The majority (about 80 t0 85%) of stars in the solar neighborhood are binary stars. Single stars like our sol are clearly within the minority. http://www.siriusresearchgroup.com/articles/ogo3.shtml The Sirius Research Group / Email ~ Life upon Venus offers energy to burn, even though as such it will not actually burn within such an O2 starved environment as having been hosting a perfectly rational township of a community that includes a bridge and a few of your standard rigid airships plus that nifty UFO Park-n-Ride Tarmac: http://guthvenus.tripod.com/gv-town.htm The ESA Russian/China LSE-CM/ISS (Lunar Space Elevator) as situated within the ME-L1/EM-L2 zone http://guthvenus.tripod.com/lunar-space-elevator.htm Venus ETs, Earthly ETs plus a few other somewhat testy topics by; Brad Guth / GASA-IEIS http://guthvenus.tripod.com/gv-topics.htm BTW; I've come to realize that other life must have been possible upon Venus, at least as of nearly 6 years ago when I'd first interpreted upon one of so many radar images (especially of what the 36 look/pixel of an 8-bit/pixel worth of roughly 225 m/pixel resolution), as to what honestly looks quite community like, although there's also somewhat other most interesting natural aspects from such images that doesn't quite doesn't jive with the purely hot and nasty sort of roasting world as having been artificially painted and otherwise infomercial hyped by our MI5/NSA~NASA rusemasters that would like you to believe this is entirely my own doings without having a shred of evidence nor having made multiple efforts as to sharing with others from the very get-go. Of course, I've since come to perceive that our NASA summarily sucks, among other nastier if not despicable sorts of things. |
#5
|
|||
|
|||
Joseph Lazio and Alfred A. Aburto Jr.,
That's rather downright odd. Here I'd honestly contributed as to the matter of an astronomy fact that Sirius-b was most likely if not astrophysics-101 somewhat required as once upon a time being such a red-giant, and lo and behold, gosh darn if it seems as though all of the topic lights went out. Why the heck is that? or perhaps what's so gosh darn taboo/nondisclosure about the Sirius star system? http://www.solstation.com/stars/sirius2.htm Hunt for Sirius C and Substellar Companions According to Duchner and Brown (2000 preprint -- in postscript), three analyses of the proper motion of Sirius found a perturbation in the orbit of Sirius B with a period around six years (Ch. Volet, 1932; Walbaum and Duvent, 1983; and Benest and Duvent, 1995). The analyses did not resolve whether the perturbing body orbits Sirius A or B, although dynamical simulations suggest that stable orbits exist around both stars at circumstellar distances up to more than half the binary system's closest separation of 8.1 AUs (Daniel Benest, 1989). Because ancient astronomers believed that Sirius was red in color as late as 2,000 years ago, some investigators wonder if the system may have a third stellar component, Sirius C, with about five percent of Sol's mass that implies a spectral type M5-9 in a six-year elliptical orbit around Sirius A (Benest and Duvent, 1995). A recent search for faint companions using the Hubble Space Telescope found no supporting evidence for a large Jupiter or brown dwarf sized object, although the observed positions of Sirius AB -- Gl 244 AB -- differed from published orbital elements (Schroeder et al, 2000). http://www.tcnj.edu/~pfeiffer/AST261Chap3.html 4. The majority (about 80 t0 85%) of stars in the solar neighborhood are binary stars. Single stars like our sol are clearly within the minority. http://www.siriusresearchgroup.com/articles/ogo3.shtml The Sirius Research Group / Email ~ Life upon Venus offers energy to burn, even though as such it will not actually burn within such an O2 starved environment as having been hosting a perfectly rational township of a fairly robust community that includes a bridge and a few of your standard rigid airships plus that nifty UFO Park-n-Ride Tarmac: http://guthvenus.tripod.com/gv-town.htm The ESA Russian/China LSE-CM/ISS (Lunar Space Elevator) as situated within the ME-L1/EM-L2 zone http://guthvenus.tripod.com/lunar-space-elevator.htm Venus ETs, Earthly ETs plus a few other somewhat testy topics by; Brad Guth / GASA-IEIS http://guthvenus.tripod.com/gv-topics.htm BTW; I've come to realize that other life (possibly ETs) must have been possible upon Venus, at least as of nearly 6 years ago when I'd first interpreted upon one of so many terrific radar images (especially of what the 36 look/pixel of an 8-bit contrast worth of roughly 225 m/pixel resolution), as to what honestly looks quite community like, although there's also somewhat other most interesting natural aspects from such images that doesn't quite jive with the purely hot and nasty sort of roasting world as having been artificially PhotoShop painted and otherwise infomercial hyped by our MI5/NSA~NASA rusemasters that would like you to believe this is entirely my own doings without having a shred of evidence nor having made multiple efforts as to sharing with others from the very get-go. Of course, I've since come to perceive that our NASA (MI5/NSA) summarily sucks, among other much nastier if not despicable sorts of things. |
#6
|
|||
|
|||
Joseph Lazio and Alfred A. Aburto Jr.,
Here I'd thought this was a perfectly terrific topic of "Life develop in the expanded habitable zones around Red Giant Stars", of the sorts of red-giants as once upon a time having been similar to our sun, thus having to suggest as to those sorts of stellar environments as having been much older than our sun, such as for Sirius-b as having to have been just such a red-giant in order that early astronomy had pegged such as a very reddish star system. Unfortunately, mention anything Sirius and the problem is is that all of the lights go out, meaning that simply because it's the nearest significant other star system that could have and may still accommodate viable planets, not to mention the stellar motion of our an ongoing elliptical recession which clearly places us rather nearby that sucker from time to time, is just another good example of the ulterior motives of this and most other groups that would much rather focus upon their believing in and fostering a well known pack of lies than to focus upon the nearby truth and nothing but the truth. I guess social/political conditional physics and of their hocus pocus soft-astronomy of MOS LLPOF brown-nose ideology is all that matters. Wouldn't want to rock any of those pagan intellectual mainstream boats, especially any of those good ships hauling public funding for whatever's going to suit their mutually perpetrated status quo, of thereby without a stitch of remorse towards fostering as much collateral damage and of the innocent blood and guts of those standing in the way of their ruse/sting of the century is apparently the one and only viable course. ~ In spite of the ongoing orchestrated status quo, it seems there's been other life upon Venus http://guthvenus.tripod.com/gv-town.htm Russian/China LSE-CM/ISS (Lunar Space Elevator) as interactive within the ME-L1/EM-L2 sweet-spot http://guthvenus.tripod.com/lunar-space-elevator.htm Of things Sirius, proto-moons, Venus, Earthly ETs & somewhat testy topics by; Brad Guth / GASA-IEIS http://guthvenus.tripod.com/gv-topics.htm |
#7
|
|||
|
|||
Brad Guth wrote:
Joseph Lazio and Alfred A. Aburto Jr., Here I'd thought this was a perfectly terrific topic of "Life develop in the expanded habitable zones around Red Giant Stars", of the sorts of red-giants as once upon a time having been similar to our sun, thus having to suggest as to those sorts of stellar environments as having been much older than our sun, such as for Sirius-b as having to have been just such a red-giant in order that early astronomy had pegged such as a very reddish star system. I wonder if life could have evolved in the variable, expanding habitable zone around the "Ruby Star"? http://www.astroscience.org/abdul-ahad/ruby-star.htm With a habitable zone fluctuating anywhere between 60 and 75 AUs out, in line with the star's intrinsic power variations, I think not! AA |
#8
|
|||
|
|||
AA Institute;
I wonder if life could have evolved in the variable, expanding habitable zone around the "Ruby Star"? http://www.astroscience.org/abdul-ahad/ruby-star.htm That's an extremely interesting contribution. I think you're right, at least as for the likes of whatever's locally grown as "Ruby Star" life might have had to have become well accommodated with a certain degree of perhaps superior exoskeletal biology and/or having applied technology, such as for having to survive upon a well cloaked Venus like planet in order to deal with such extremes of that somewhat less variable environment. Of course, at 60+AU the orbit of a fairly robust planet might not involve such quick changes in their surface environment, thus livable is perhaps an obtainable goal with an open mind and the desire of seeing another day before your time is up. Perhaps if there were a Saturn like planet having reasonably large moons, whereas the host planet would form a sufficient shield that would somewhat moderate on behalf of whatever moon inhabitants. Actually, as long as there's a good amount of available energy and a few of the essential elements to go around, other life can manage to survive just about anywhere. Perhaps there actually an extremely large (100X Jupiter) sized planet that's 100+AU, as such causing the indications of the variable aspects of the Ruby Star. If so, there's a good chance that larger than Earth sized moons may coexist about that massive orb that would be somewhat acting as a proto-star of it's own right. ~ In spite of the ongoing orchestrated status quo, it seems there's been other life upon Venus http://guthvenus.tripod.com/gv-town.htm Russian/China LSE-CM/ISS (Lunar Space Elevator) as interactive within the ME-L1/EM-L2 sweet-spot http://guthvenus.tripod.com/lunar-space-elevator.htm Of things Sirius, proto-moons, Venus, Earthly ETs & somewhat testy topics by; Brad Guth / GASA-IEIS http://guthvenus.tripod.com/gv-topics.htm |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
How smart are SETI@homers? | Andrew Nowicki | SETI | 450 | June 3rd 04 01:11 AM |
Breakthrough in Cosmology | Kazmer Ujvarosy | Space Shuttle | 3 | May 22nd 04 09:07 AM |
Breakthrough in Cosmology | Kazmer Ujvarosy | Space Station | 0 | May 21st 04 08:02 AM |
Microbe from Depths Takes Life to Hottest Known Limit | Ron Baalke | Science | 0 | August 15th 03 05:01 PM |
Study: Search For Life Could Include Planets, Stars Unlike Ours | Ron Baalke | Science | 0 | August 2nd 03 02:05 AM |