Under a Crimson Sun: Prospects for Life in a Red Dwarf System
Butmore recent models have shown that winds would distribute the heat sufficientlyto avoid this atmospheric collapse. Still, life might not be a picnic around a red dwarf. Severaltimes per day flares shoot off the star, causing the UV radiation to jump by to 10, times normal. For several minutes, the star appears blue insteadof red. This increased radiation could sterilize the surface of a nearbyplanet.
Even between flares, the combination of UV light and stellarwinds can stripaway the atmosphere if nothing is protecting or replenishing it.? However, all hope is not lost.
Red Dwarf - S 2 E 6 - Parallel Universe
The high-energy radiation is predominantlyemitted by young stars. As they age, red dwarfs become less magnetically active,while continuing to shine steadily at visible wavelengths for billion yearsor more. Therefore, if an orbiting planet can just hold onto itsatmosphere through the wild early years of its red dwarf roommate, it could endup being a decent place to live.
To develop a model for how a star's magnetic activitychanges with time, Guinan and his colleague Scott Engle looked at the rotationrates of a large sample of red dwarfs.
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As expected, faster spinning stars hadmore X-ray and UV emission, as well as more flares.? The rotation causescharged material inside the star to be churned around, and this"dynamo" action generates a magnetic field. Gas around the starbecomes trapped in this field and heatedto millions of degrees. This hot gas produces the observed high energy radiation.
Under a Crimson Sun : David S. Stevenson :
By estimating the ages of stars in their sample, theresearchers were able to build up a typical red dwarf life history.? The data show that a red dwarf is born spinning rapidly, andit exhibits the corresponding magnetic activity. You can offer your link to a page which is relevant to the topic of this post.
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Summing Up: Highly recommended. Lower-division undergraduates and general readers. Hemenway, Choice, Vol. Chris Kitchin has written or contributed to over two dozen books, and has published more than articles in the astronomical journals and magazines.
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Like many other astronomers Chris's interest in the subject started early. At the age of fourteen, he constructed an 8-inch Newtonian after spending hundreds of hours grinding and polishing the main mirror from scratch. Despite using some of the largest telescopes in the world since then, Chris still enjoys just 'gazing at the heavens' - though nowadays it's through a German-made Zeiss Maksutov telescope.
Since there has been an explosion in the discovery of planets orbiting stars other than the Sun. The recent launch of the Kepler space telescope specifically to look for new worlds opens the prospect of hundreds, maybe thousands, of further exoplanets being found. Many of these planets orbits stars that are not too different from the Sun, but they are so close in to their stars that their surfaces could be flooded with seas of molten lead — or even molten iron.