APOD251016 NGC 7129的年轻"太阳"们
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图像提供 & 版权[1]: Timothy Martin[2]
英文原文:Explanation: Young suns still lie within dusty NGC 7129 , some 3,000 light-years away toward the royal constellation Cepheus . While these stars are at a relatively tender age, only a few million years old, it is likely that our own Sun formed in a similar stellar nursery around five billion years ago. Notable in the sharp image are the lovely bluish dust clouds that reflect the youthful starlight. But the compact, deep red crescent shapes are also markers of energetic, young stellar objects. Known as Herbig-Haro objects, their shape and color is characteristic of glowing hydrogen gas shocked by jets streaming away from newborn stars. Paler, extended filaments of reddish emission mingling with the bluish clouds are caused by dust grains effectively converting the invisible ultraviolet starlight to visible red light through photoluminesence . Ultimately the natal gas and dust in the region will be dispersed, the stars drifting apart as the loose cluster orbits the center of the Galaxy. At the estimated distance of NGC 7129, this telescopic field of view spans nearly 40 light-years. 说明: 年轻的恒星仍然位于尘埃密布中的NGC 7129[3]内,距离地球约3,000光年,位于皇家星座的仙王座[4]方向。 虽然这些恒星[5]的年龄相对较小,仅有几百万年,但我们的太阳很可能在大约五 十亿年前类似的恒星育婴室中形成。 在清晰的图像[6]中,值得注意的是反射[7]年轻星光的美丽蓝色尘埃云。 然而,紧凑而深红的新月形状也是高能年轻恒星天体的标志。 这些被称为赫比格-哈罗[8]天体的形状和颜色是由于氢气被喷流[9]冲击后发光的特征。 与蓝色云层混合的较淡延伸红色发射[10]丝状物是由于尘埃颗粒通过光致发光[11]将肉眼不可见的紫外线星光有效地转换为可见的红光所造成的。 最终,该区域的原生气体和尘埃将被驱散,恒星将逐渐分散[12],随着松散的星团绕着银河系中心运行。 在NGC 7129的估计距离下,这一望远镜视野的跨度接近40光年。
明日的图片: moon of a minor planet[13]
Authors & editors: Robert Nemiroff[14] (MTU[15]) & Jerry Bonnell[16] (UMCP[17])
NASA Official: Amber Straughn Specific rights apply[18].
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& Michigan Tech. U.[26]
太空天文实验室(成功大学物理系) <br/> 编辑:<a href="mailto:hantzong.su@gmail.com" style="color:gray;" target="_blank">苏汉宗</a>
编辑:陈炳志[27]
[1]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[2]https://app.astrobin.com/u/AccidentalAstronomers
[3]https://ui.adsabs.harvard.edu/abs/2004ApJS..154..374G/abstract
[4]http://earthsky.org/?p=3468
[5]http://arxiv.org/abs/0907.4252
[6]https://app.astrobin.com/u/AccidentalAstronomers?i=o44fav#gallery
[7]http://apod.nasa.gov/apod/ap011228.html
[8]https://en.wikipedia.org/wiki/Herbig%E2%80%93Haro_object#Discovery_and_history_of_observations
[9]http://sparky.rice.edu/~hartigan/movies.html
[10]http://arxiv.org/abs/astro-ph/0309674
[11]http://apod.nasa.gov/apod/ap051229.html
[12]http://en.wikipedia.org/wiki/Open_cluster#Eventual_fate
[13]http://apod.nasa.gov/apod/ap251017.html
[14]http://www.phy.mtu.edu/faculty/Nemiroff.html
[16]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[18]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[19]https://www.nasa.gov/about/highlights/HP_Privacy.html
[20]https://www.nasa.gov/general/accessibility/
[21]https://www.nasa.gov/privacy/
[22]https://astrophysics.gsfc.nasa.gov/
[24]https://www.nasa.gov/centers/goddard/
[25]https://science.nasa.gov/learners
[27]mailto:alfred@ncku.edu.tw
http://apod.nasa.gov/apod/ap251016.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap251016.html
