1 / 27

t he brightest stars do not live alone

t he brightest stars do not live alone. B ackground Design E. Buunk / S.E. de Mink, HST image: NASA Paresce. Selma E. de Mink Hubble Science Briefing , February 7, 2013 Hubble Fellow at Space Telescope Science Institute / Johns Hopkins University. t he brightest stars .

caraf
Télécharger la présentation

t he brightest stars do not live alone

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. the brightest stars do not live alone Background Design E. Buunk / S.E. de Mink, HST image: NASA Paresce Selma E. de Mink Hubble Science Briefing , February 7, 2013 Hubble Fellow at Space Telescope Science Institute / Johns Hopkins University

  2. the brightest stars are up to a million times brighter than the Sun are rare Background Design E. Buunk / S.E. de Mink, HST image: NASA Paresce live fast and die young are embedded in clouds of gas & dust are very hard to study 2

  3. This is what we thought … Massive Stars* BOOM Low-mass Stars *8-150 times more massive than the sun …. but it turns out that it is not that simple 3

  4. Some stars are Single 4

  5. The Sun is a single star If the Sun were the size of a baseball … … in Yankee stadium… … the nearest star would be in Houston, TX (1,400 mi. away) 5

  6. many stars are quite unlike the Sun Artist impression: (ESO/L. Calçada/Nick Risinger) Alpha Centauri, our nearest neighbor, is a multiple system: Star A & B orbit each other every 80 years 6

  7. another famous multiple Alcor & Mizar Image Credit: ESO Online Digitized Sky Survey 7

  8. 3 binaries forming a sextuple system Alcor A & B Mizar A: a & b Mizar B: a & b A Spectroscopic binary Zimmerman et al. 2009 Image Credit: ESO Online Digitized Sky Survey Mizar A & B 8

  9. Classic definition Binary System = a system of two objects in space (usually stars), which are so close that their gravitationalinteraction causes them to orbitaround their common center of mass. According to this definition, almost all stars are binaries(or multiples). The Sun is one of the exceptions. 9

  10. Not every binary is equal • Close Binary System • Closer than the distance from the Sun to Mars. • One orbit takes between a day and few years. • Wide Binary System • Widerthan the distance from the Sun to Jupiter. • One orbit takes a few years up to centuries or more. 10

  11. Close binary stars 11

  12. A typical star becomes about 100-1000 times bigger during its life … 12

  13. = Therefore, stars in close binary systems will interact 13

  14. Artist Illustration of a “vampire star system”: ESO: Calçada/Kornmesser/de Mink 14

  15. Questions so far? 15

  16. How many stars are in such close binaries? 16

  17. Six young star clusters 17

  18. Using the Doppler effect to find binaries 18

  19. 19

  20. 20

  21. How many stars are in such close binaries? 21

  22. What % of massive stars will interact 22 Sana & de Mink et al. Science, Cartoons: de Mink / Buunk

  23. It is not this simple … Massive Stars* BOOM Low-mass Stars See video: http://hubblesite.org/newscenter/archive/releases/2012/33/video/b/ 23

  24. Bonus:cool things that binaries do 24

  25. make fast rotating runaway stars 25

  26. Conclusion 26

  27. the brightest stars do not live alone Background Design E. Buunk / S.E. de Mink, HST image: NASA Paresce Science 27 July 2012: Vol. 337 no. 6093 pp. 444-446 Selma E. de Mink More information: http://hubblesite.org/newscenter/archive/releases/2012/33/full/

More Related