1. Brown Dwarfs Niels Bos 7 May 2001

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

3. 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

4. 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

5. ... the history 1963 - First indications 1975 - The name ‘Brown Dwarf’ is suggested 1980`s - Intensive search 1995 - Brown Dwarfs

6. ... 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

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

8. … a new hope PPI 15 Brown Dwarfs

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

11. Other questions? Brown Dwarfs