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| N° 21-1999: A butterfly-shaped 'Papillon Nebula' yields secrets of massive star birth 10 June 1999 Newborn stars are difficult to observe because they are always hidden within dense clouds of dust. And if the star is really a massive one, say 10 times heavier than our Sun, spotting the starbirth is almost impossible : massive stars evolve so quickly that by the time the dust disperses they are 'teenagers', not babies any more, 20 of their lifetime has already passed. Using the ESA/NASA Hubble Space Telescope a team of European astronomers (*) has been able to pinpoint several of these massive baby stars, one of which has created - while evolving - an impressive butterfly-shaped nebula of dust around it during its early life. The newly found massive newborn stars are in one of our satellite galaxies, the Large Magellanic Cloud (LMC), 170,000 light-years away - right in our cosmic backyard. The Hubble image shows a view of a turbulent cauldron of starbirth, unromantically called N159. Fierce stellar winds from the hot newborn massive stars sculpt ridges, arcs and filaments in the vast cloud, which is over 150 light-years across. This is the clearest image ever obtained of this region. Seen for the first time is the butterfly-shaped or 'Papillon' (French for butterfly) nebula, buried in the centre of the maelstrom of glowing gases and dark dust. The unprecedented details of the structure of the Papillon, itself less than 2 light-years in size (about 1/2000th of a degree in the sky), are seen in the inset. This bipolar shape might be explained by the outflow of gas from the massive star (over 10 times the mass of our Sun) hidden in the central absorption zone. Such stars are so hot and bright that the pressure created by their light halts the infall of gas and directs it away from the star in two opposite directions. This mechanism is not fully understood, but presumably the outflow is constrained around the star's equator and directed to escape along the star's rotation axis.
This observation is part of a search for young massive stars in the LMC. This butterfly-shaped nebula is considered to be a rare class of compact 'blob' around newborn, massive stars. The red in this true-colour image comes from the emission of hydrogen and the yellow from hotter oxygen gas. The picture was taken on 5 September 1998 with Wide Field Planetary Camera 2.
Dr. Mohammad Heydari-Malayeri, Observatoire de Paris
Co-investigators:
Dr. Michael R. Rosa, Space Telescope European Coordinating Facility
Dr. Hans Zinnecker, Astrophysik Institute-Potsdam University
Dr. Lise Deharveng, Observatoire de Marseille
Dr. Vassilis Charmandaris, Observatoire de Paris
For more information, please contact:
Space Telescope Science Institute :
Ray Villard
Cheryl Gundy
For further information on HST and to view the picture, visit the ESA science web pages at :
For further information on ESA :
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