Astronomy

ESO: Three broods of young stars spotted in the Orion Nebula Cluster

The latest report from ESO  (European Southern Observatory):

A Tale of Three Stellar Cities

OmegaCAM — the wide-field optical camera on ESO’s VLT Survey Telescope (VST) — has captured the spectacular Orion Nebula and its associated cluster of young stars in great detail,  producing this beautiful new image. This famous object, the birthplace of many massive stars, is one of the closest stellar nurseries, at a distance of about 1350 light-years. [Larger image]
Using new observations from ESO’s VLT Survey Telescope, astronomers have discovered three different populations of young stars within the Orion Nebula Cluster. This unexpected discovery adds very valuable new insights for the understanding of how such clusters form. It suggests that star formation might proceed in bursts, where each burst occurs on a much faster time-scale than previously thought.

Surprise: astronomers have found what look like three different generations of baby stars​ within the Orion Nebula Cluster.
[Higher resolution video]

OmegaCAM — the wide-field optical camera on ESO’s VLT Survey Telescope (VST) — has captured the spectacular Orion Nebula and its associated cluster of young stars in great detail, producing a beautiful new image. This object is one of the closest stellar nurseries for both low and high-mass stars, at a distance of about 1350 light-years [1].

OmegaCAM — the wide-field optical camera on ESO’s VLT Survey Telescope (VST) — has captured the spectacular Orion Nebula and its associated cluster of young stars in great detail,  producing this beautiful new image. This famous object, the birthplace of many massive stars, is one of the closest stellar nurseries, at a distance of about 1350 light-years. On this plot different populations of young stars are marked in different colours. The blue ones are oldest and the red youngest, with green ones an intermediate age. These stars seems to have formed in three bursts of star formation during the last three million years. [Larger image]
But this is more than just a pretty picture. A team led by ESO astronomer Giacomo Beccari has used these data of unparallelled quality to precisely measure the brightness and colours of all the stars in the Orion Nebula Cluster. These measurements allowed the astronomers to determine the mass and ages of the stars. To their surprise, the data revealed three different sequences of potentially different ages.

“Looking at the data for the first time was one of those ‘Wow!’ moments that happen only once or twice in an astronomer’s lifetime,” says Beccari, lead ­author of the paper presenting the results. “The incredible quality of the OmegaCAM images revealed without any doubt that we were seeing three distinct populations of stars in the central parts of Orion.”

Monika Petr-Gotzens, co-author and also based at ESO Garching, continues,

“This is an important result. What we are witnessing is that the stars of a cluster at the beginning of their lives didn’t form altogether simultaneously. This may mean that our understanding of how stars form in clusters needs to be modified.”

This video sequence starts with a wide view of the Milky Way and slowly zooms in on the Orion Nebula, one of the brightest nearby regions of active star formation. The final view shows a very detailed new view of the stellar nursery from the VLT Survey Telescope. Credit: ESO, N. Risinger (skysurvey.org), Digitized Sky Survey 2. Music: Johan B. Monell (www.johanmonell.com)

The astronomers looked carefully at the possibility that instead of indicating different ages, the different brightnesses and colours of some of the stars were due to hidden companion stars, which would make the stars appear brighter and redder than they really were. But this idea would imply quite unusual properties of the pairs, which have never before been observed. Other measurements of the stars, such as their rotation speeds and spectra, also indicated that they must have different ages [2].

“Although we cannot yet formally disprove the possibility that these stars are binaries, it seems much more natural to accept that what we see are three generations of stars that formed in succession, within less than three million years,”

concludes Beccari.

This pan video shows a richly detailed new view of the Orion Nebula from the VLT Survey Telescope at ESO’s Paranal Observatory in Chile. This star formation region comprises glowing clouds of gas, veins of dark dust and many very young stars. Credit: ESO. Music: Johan B. Monell (www.johanmonell.com)

The new results strongly suggest that star formation in the Orion Nebula Cluster is proceeding in bursts, and more quickly than had been previously thought.

Notes

[1] The Orion Nebula has been studied by many of ESO’s telescopes, including images in visible light from the MPG/ESO 2.2-metre telescope (eso1103) and infrared images from VISTA (eso1701) and the HAWK-I instrument on the Very Large Telescope (eso1625).

[2] The group also found that each of the three different generations rotate at different speeds — the youngest stars rotate the fastest, and the oldest stars rotate the slowest. In this scenario, the stars would have formed in quick succession, within a time frame of three million years.

This chart shows the location of the Orion Nebula (Messier 42) in the sword of the famous constellation of Orion (the Hunter). This map shows most of the stars visible to the unaided eye under good conditions and the Orion Nebula itself is highlighted with a red circle on the image. This grand star formation region can be seen with the unaided eye and is an impressive sight in moderate-sized amateur telescopes.