PPT-Stellar evolution and star clusters

Key variable is mass of star directly measured only for binary stars but it determines position on main sequence Cluster ages Mainsequence luminosity increases much faster than mass therefore massive stars use up their fuel much faster. Galaxies. T.Naab. , P. Johansson, R. . Cen. , K. . Nagamine. , R. . Joung. . and J.P.O.. PPPL:, 19 Dec . 2012. ApJ.L.,. 658,710 . (2007) ApJ.,697, . 38 . (2009). ApJ.L.,699,L178 (. 2009. ). ApJ.,725,2312 . With a wide-field multi-IFU spectrograph. Cluster studies. Clusters provide large samples of galaxies in a moderate field. Unique perspective on the interaction of galaxies with their environment. As they operate much as a closed box, they are useful as tracers of galaxy evolution and of cosmology. . CDM Cosmology. Oleg . Gnedin. (University of Michigan. ). What we knew before HST: globular clusters are old, dense, compact – a distinct type of stellar spheroids. Kormendy. (1985). Over 20 years the Hubble Space Telescope has revealed young massive star clusters in interacting and gas-rich galaxies.. . Natalia Storch, Kassandra Anderson & Dong Lai. Cornell University. Many hot Jupiter systems . have . been found to exhibit misalignment between the . orbital axis (. L. , the axis perpendicular to the orbital plane) . 12 Oct 2012. Banyuls. MODELING COUNTS AND CIBA WITH MAIN SEQUENCE AND STARBURST GALAXIES. Matthieu. Béthermin. CEA . Saclay. In collaboration with Mark Sargent, . Emanuele. . Daddi. , . Georgios. . 1. /28. Important for transits (see next slides).. . Transit depth = [ . R. planet. (. λ. ,t. ) / . R. star. (. λ,t. ) ]. 2. Not so important for eclipses because the eclipse is a simple difference, and the stellar variability typically is slower than the eclipse: . Wen-Ping . Chen . National . Central . University . Census of Galactic open clusters. . Dynamical evolution of a star cluster. . Star clusters as targets and as tools. Outstanding issues. 2017 April 28 PMO . Revision . lecture. Lecture slides available in . powerpoint. and . pdf. from. www.star.le.ac.uk. /~. mbu. /. lectures.html. Everything taught in the course is examinable…... However, here is a crib sheet of what to focus on. How big are stars?. How far . away?. How . luminous?. How hot?. How old, and how much longer to . live?. C. hemical . composition?. How are they moving?. Are they isolated or in clusters?. 1. How Far Away are the Stars?. Evolution off the Main Sequence. Main Sequence Lifetimes. Most massive (O and B stars): millions of years. Stars like the Sun (G stars): billions of years. Low mass stars (K and M stars): a trillion years! . Ann Marie Cody. NPP fellow at NASA Ames. November 2, 2015. Acknowledgments. Ames collaborators. : Steve Howell, Tom Barclay, Fergal . Mullally. , Susan Thompson, . Geert. . Barentsen. , Jason Rowe, student interns: Bryan Mann, . Ben Keller (McMaster University). James . Wadsley. , Hugh . Couchman. CASCA 2015. Paper. : . astro-ph. : 1505.06268. Keller, . Wadsley. & . Couchman. 2015. Background Image: Gas column density of IGM around a simulated . Chap 17-18: Stellar Evolution – the Life and Death of a Star… Here’s the story we’ll tell… Lowest mass stars and their evolution Low mass star evolution High mass star evolution Stellar death, and stellar corpses Laura . Magrini. INAF- . Osservatorio. . Astrofisico. di . Arcetri. In Our Galaxy. Open clusters (disc population): . Many (~2200 known clusters). . even more new candidates in the inner disc from infrared surveys .