R Coronae Australis: Variable Star
science·@jonathanxvi·
0.000 HBDR Coronae Australis: Variable Star
<html> <p><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/78/R_Coronae_Australis_region.jpg/800px-R_Coronae_Australis_region.jpg" width="800" height="780"/></p> <p> <em>A colour photo of the R Coronae Australis region in the southern Milky Way. Image source: </em><a href="https://upload.wikimedia.org/wikipedia/commons/thumb/7/78/R_Coronae_Australis_region.jpg/800px-R_Coronae_Australis_region.jpg"><em>[1]</em></a></p> <p> R Coronae Australis is a known variable star belonging to the spectral type A5 Liev, and is about 26.8 light years away from Earth. It is a relatively young star that is still accumulating material on its surface. The star has an apparent magnitude of 11.5. R Coronae Australis is a Herbig Ae / Be star, ie a pre-main star, still in star formation phase, belonging to the spectral type A or B, less than 10 million years old, surrounded by a disk circum-stellar, has a gas and dust envelope. </p> <p><iframe width="560" height="315" src="https://www.youtube.com/embed/9wP-VQ-GfLA" frameborder="0" allowfullscreen></iframe></p> <p> <a href="https://www.youtube.com/channel/UCJPWc40bP-lakXng197CV-w">Christopher Stobiecki</a> </p> <p> The intense radiation emanating from these hot young stars interacts with the surrounding gas and is reflected or re-emitted at different wavelengths. To these complex processes, determined by the physics of the interstellar medium and the properties of the stars, are due to the magnificent colors of the nebula. The celestial cloudiness that is observed in the image is largely the result of the reflection of the light of the star in small particles of dust. Young stars in the R Coronae Australis complex have masses similar to the Sun and do not emit sufficient ultraviolet light to ionize a significant part of the surrounding hydrogen. Consequently, the cloud does not shine with the characteristic red color that is observed in several zones of star formation. </p> <p> The star R Coronae Australis is not observable to the naked eye, but the tiny constellation with crown form where it is is easily detectable from dark locations, due to its proximity in the sky to the great constellation of Sagittarius and to the clouds rich in stars towards the center of our galaxy, the Milky Way. </p> <p> More details here: <a href="https://en.wikipedia.org/wiki/R_Coronae_Australis">RCA</a> , <a href="https://en.wikipedia.org/wiki/Corona_Australis">CA</a></p> <p><img src="https://icueva.files.wordpress.com/2010/09/animacion-1-650.gif?w=655" width="650" height="484"/></p> <p><em>stars S and R corona australis. Image source: </em><a href="https://icueva.files.wordpress.com/2010/09/animacion-1-650.gif?w=655"><em>[2]</em></a></p> <p><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/ESO-R_Coronae_Australis_Complex-Phot-25b-00-hires.jpg/800px-ESO-R_Coronae_Australis_Complex-Phot-25b-00-hires.jpg" width="800" height="798"/></p> <p> <em> R Coronae Australis. Image source: </em><a href="https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/ESO-R_Coronae_Australis_Complex-Phot-25b-00-hires.jpg/800px-ESO-R_Coronae_Australis_Complex-Phot-25b-00-hires.jpg"><em>[3]</em></a></p> <p><iframe width="560" height="315" src="https://www.youtube.com/embed/5HRTPbNw1fs" frameborder="0" allowfullscreen></iframe></p> <p> <a href="https://www.youtube.com/channel/UC8SgBnHvY8wzrX3c0VcHfFg">djxatlanta</a> </p> <p><br></p> <p><img src="https://s26.postimg.org/9tpgvvhjd/esteee.png " width="762" height="692"/></p> </html>
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