Infant Stars in the Milky Way
Herschel Reveals Baby Star in the Milky Way (And Not Babies Sun in the Solar System)
Birth of a star similar to the human need time to grow. And the time scale of the growth took millions - billions of years.
Baby Star is seen Herschel
HII region RCW 120 image taken Herscel. Credit: ESA, PACS & SPIRE Consortia, A. Zavagno (Laboratoire d'Astrophysique de Marseille)
Last May, the space observatory Herschel ESA photograph the new image that shows the Proto 2 area around a star in our galaxy that is ionized Milky Way. Herschel detected the star is currently in the early stages of evolution. News this to the attention of the researchers because the information obtained can be an important key to understanding the formation of massive stars is still a mystery to this day.
Infants were seen Herschel star has a mass of more than 8 solar masses. What makes these two rare forerunner of the star is not as common as stars whose mass is smaller. High mass stars have a short life time, because the nuclear fuel in him would be consumed or experienced burning with a very fast pace before then end their lives in supernova explosions.
This scarcity means it will be difficult to be able to observe the rare giant star, but the characteristics of rare objects is important for understanding the dynamics and chemical evolution of galaxies.
Massive Star Forming Mechanism
What is so massive star formation triggering mechanism is still being debated. And to be able to detect such a massive object in the initial stages of its evolution is not an easy job. How not, the forerunner of the star is still in the cocoon of dust that is hidden from view. The dust absorbs light and re-radiate at infrared wavelengths. Because the Herschel could see the massive star birth process.
One theory of massive stars formed in the HII area which is hot hydrogen gas bubbles that have been ionized by very strong radiation from previous generations of massive stars were already formed. Temperature difference between the interior (up to 10 000 K) and the material around (colder than 100 K) causes the bubble expands until it reaches supersonic speeds. The expanding bubble sweeps the surrounding neutral material layers which are then fragmented into seeds (forerunner) of high density new generation of great mass.
Model "collect and collapse", a new generation of star formation scenario that triggered the previous generations of massive stars. Credit: Deharveng & Zavagno, LAM, France
Data from Herschel
In his observations, Herschel HII target area in this case RCW 120 and N49 are expected to provide evidence that supports the theory of massive star formation earlier. And Herschel did manage to see and photograph the massive stars are still very young at the border between the two areas. Both objects are just starting life no less than several tens of thousands of New Year had never observed before. This is the first time for astronomers to see what triggers the formation of massive stars.
According to Annie Laboratoire d'Astrophysique Zavagno of de Marseille, "a very high density of the material around the bubbles and intense motion due to wind bintanglah responsible for the process of star formation. And that then lead to the emergence of new population of more massive stars around him. "
The data not only brought Herschel astronomers know the existence of previously unknown young stars terdeksi. The astronomers also managed to perform the characterization of the physical characteristics of the star baby.
Protostar with a mass of 8-10 solar masses is indeed much more massive than the Sun and the vision Herschel, the object is surrounded by a large envelope mass 2000 solar masses. And it will continue to grow into a more massive star to become a whole person. ?
Reference: ESA
Herschel Reveals Baby Star in the Milky Way (And Not Babies Sun in the Solar System)
Birth of a star similar to the human need time to grow. And the time scale of the growth took millions - billions of years.
Baby Star is seen Herschel
HII region RCW 120 image taken Herscel. Credit: ESA, PACS & SPIRE Consortia, A. Zavagno (Laboratoire d'Astrophysique de Marseille)
Last May, the space observatory Herschel ESA photograph the new image that shows the Proto 2 area around a star in our galaxy that is ionized Milky Way. Herschel detected the star is currently in the early stages of evolution. News this to the attention of the researchers because the information obtained can be an important key to understanding the formation of massive stars is still a mystery to this day.
Infants were seen Herschel star has a mass of more than 8 solar masses. What makes these two rare forerunner of the star is not as common as stars whose mass is smaller. High mass stars have a short life time, because the nuclear fuel in him would be consumed or experienced burning with a very fast pace before then end their lives in supernova explosions.
This scarcity means it will be difficult to be able to observe the rare giant star, but the characteristics of rare objects is important for understanding the dynamics and chemical evolution of galaxies.
Massive Star Forming Mechanism
What is so massive star formation triggering mechanism is still being debated. And to be able to detect such a massive object in the initial stages of its evolution is not an easy job. How not, the forerunner of the star is still in the cocoon of dust that is hidden from view. The dust absorbs light and re-radiate at infrared wavelengths. Because the Herschel could see the massive star birth process.
One theory of massive stars formed in the HII area which is hot hydrogen gas bubbles that have been ionized by very strong radiation from previous generations of massive stars were already formed. Temperature difference between the interior (up to 10 000 K) and the material around (colder than 100 K) causes the bubble expands until it reaches supersonic speeds. The expanding bubble sweeps the surrounding neutral material layers which are then fragmented into seeds (forerunner) of high density new generation of great mass.
Model "collect and collapse", a new generation of star formation scenario that triggered the previous generations of massive stars. Credit: Deharveng & Zavagno, LAM, France
Data from Herschel
In his observations, Herschel HII target area in this case RCW 120 and N49 are expected to provide evidence that supports the theory of massive star formation earlier. And Herschel did manage to see and photograph the massive stars are still very young at the border between the two areas. Both objects are just starting life no less than several tens of thousands of New Year had never observed before. This is the first time for astronomers to see what triggers the formation of massive stars.
According to Annie Laboratoire d'Astrophysique Zavagno of de Marseille, "a very high density of the material around the bubbles and intense motion due to wind bintanglah responsible for the process of star formation. And that then lead to the emergence of new population of more massive stars around him. "
The data not only brought Herschel astronomers know the existence of previously unknown young stars terdeksi. The astronomers also managed to perform the characterization of the physical characteristics of the star baby.
Protostar with a mass of 8-10 solar masses is indeed much more massive than the Sun and the vision Herschel, the object is surrounded by a large envelope mass 2000 solar masses. And it will continue to grow into a more massive star to become a whole person. ?
Reference: ESA