Brown Dwarfs Niels Bos 7 May 2001. Brown Dwarfs... the facts ? Brown Dwarfs Stars Big Bright Hot Produce energie by fusion Planets Small Cool Orbit stars.

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Presentation transcript:

Brown Dwarfs Niels Bos 7 May 2001

Brown Dwarfs... the facts ? Brown Dwarfs Stars Big Bright Hot Produce energie by fusion Planets Small Cool Orbit stars Produce no energie &

Is not heavy enough for nuclear reactions Radiates very faint in the near-infrared A Brown Dwarf is formed is the same way as a star, but … Brown Dwarfs

Planets & Brown Dwarfs Planets are smaller/ lighter Planets have a solid core They are formed in a complete different way Brown Dwarf Planet Brown Dwarfs

... the history First indications The name ‘Brown Dwarf’ is suggested 1980`s - Intensive search Brown Dwarfs

... a difficult search Radiation Near-infrared Steadily fades in time Search near known stars Binary system Advantages Search in star-formation clusters Brown Dwarfs are brightest Brown Dwarfs

The Lithium Test Even the lowest-mass star burns his lithium in less then 100 million years Brown Dwarfs

… a new hope PPI 15 Brown Dwarfs

… one question Can Brown Dwarfs account for a fraction of the total amount of dark matter? Brown Dwarfs

Other questions? Brown Dwarfs

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