the brightest stars do not live alone

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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

Text of the brightest stars do not live alone

the brightest stars do not live alone
Background DesignE. 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 the brightest stars are up to a million times brighter than the Sun
are rare Background DesignE. 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 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 Some stars are Single 4 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) Credit: sdowww.lmsal.com, maps.google.com 5 many stars are quite unlike the Sun
Artist impression: (ESO/L. Calada/Nick Risinger) Photo: S. Brunier/ESO. Two stars, each nearly as bright as the other, circle around it, every eighty years. They come within 1.7 billion kilometres of each other, and are 5.3 billion kilometres from each other at their maximum distance apart. Alpha Centauri A and B are practically twin sisters of the Sun. Alpha Centauri, our nearest neighbor, is a multiple system: Star A & B orbit each other every 80 years 6 another famous multiple
Alcor & Mizar Credit: J. Benson et al., NPOI Group, USNO, NRL Image Credit: ESO Online Digitized Sky Survey 7 3 binaries forming a sextuple system
Alcor A & B Mizar A: a & b Mizar B: a & b A Spectroscopic binary Zimmerman et al. 2009 Credit: J. Benson et al., NPOI Group, USNO, NRL Image Credit: ESO Online Digitized Sky Survey Mizar A & B 8 Classic definition Binary System =
a system of two objects in space (usually stars), which are so close that their gravitational interaction causes them to orbit around their common center of mass. According to this definition, almostall stars are binaries (or multiples). The Sun is one of the exceptions. 9 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 Wider than the distance from the Sun to Jupiter. One orbit takesa few years up to centuries or more. 10 Close binary stars 11 A typical star becomes about 100-1000 times bigger during its life
12 = Therefore, stars in close binary systems will interact 13 Artist Illustration of a vampire star system: ESO: Calada/Kornmesser/de Mink
14 Questions so far? 15 How many stars are in such close binaries?
16 Six young star clusters
17 Using the Doppler effect to find binaries
18 19 20 How many stars are in such close binaries?
21 What % of massive stars will interact
22 Sana & de Mink et al. Science, Cartoons: de Mink / Buunk It is not this simple Massive Stars* Low-mass Stars BOOM
See video: 23 Bonus: cool things that binaries do
24 make fast rotating runaway stars
25 Conclusion 26 the brightest stars do not live alone
Background DesignE. Buunk / S.E. de Mink, HST image: NASA Paresce Science 27 July 2012: Vol. 337 no. 6093 pp Selma E. de Mink More information: