New view of a stellar nursery

A European Southern Observatory image showcases one of the nearest regions of star formation.
By | Published: July 7, 2004
Orion Nebula (M42)
At the heart of the stellar nursery known as the Orion Nebula lies a small grouping of stars called the Orion Trapezium Cluster. These stars are 15 to 30 times more massive than our sun, but are only about 300,000 years old on average. (Our middle-aged, five-billion-year-old sun seems ancient by comparison.)
European Southern Observatory
July 7, 2004
Positioned in the Milky Way at a distance of 1,500 light-years, the Orion Nebula is essential to the study of star formation. This active area has produced thousands of new stars within the past 10 million years. With a new image captured by the European Southern Observatory (ESO), we are reminded why M42 is one of the most popular rich regions in the night sky.

Led by Massimo Robberto of the European Space Agency and the Space Telescope Science Institute, the team used the Wide-Field Imager (WFI) — a 67-million pixel CCD device attached to the 2.2-meter scope at La Silla in Chile — to capture the image.

Using previous observations of the Orion Nebula and those performed with the WFI, astronomers study the maas accretion rate — the rate at which mass collides with young stars and the effect this has on the stars’ positions. Astronomers believe the later phases of star formation are influenced by the onset of ionizing radiation from larger stars. Previous observations have shown the mass accretion rates are lower in the Orion Nebula than in other more diffuse stellar nurseries. Indications are that the WFI observations should validate this theory.