Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cemda..49..265z&link_type=abstract
Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958), vol. 49, no. 3, 1990, p. 265-272.
Astronomy and Astrophysics
Astronomy
7
Comets, Interstellar Gas, Oort Cloud, Star Clusters, Stellar Evolution, Interstellar Matter, Solar System Evolution, Star Formation
Scientific paper
It is generally assumed that the solar system is surrounded by a swarm of comets, the so-called Oort Cloud, which contains approximately 10 to the 11th members. The observed comets belong to a small subsection of the Cloud, and they have very elongated orbits. The origin of the Cloud is presently unclear. Here the possibility that the comets were born in a star cluster together with the sun is considered, following the evolution of the star cluster with its embedded swarm of comets and calculating the rate at which stars accumulate stable comet companions. It is concluded that, if the Oort Cloud was born in this process, then the present-day density of comets in interstellar space has to be high, and comets make a significant contribution to the overall mass density of the Galaxy.
Valtaoja Leena
Valtonen Mauri J.
Zheng Jia-Qing
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