PH1600: Introductory Astronomy
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PH1600: Introductory Astronomy
Lecture 15: Star Clusters
PH1600: Introductory Astronomy
Lecture 15: Star Clusters
Next Lecture: Star Death & Black Holes
School: Michigan Technological University
Professor: Robert Nemiroff
Online Course WebCT pages:
http://courses.mtu.edu/
This class can be taken online ONLY, class
attendance is not required!
You are responsible for…
Lecture material
Listed wikipedia entries
But not higher math
APODs posted during the semester
APOD review every week during lecture
Completing the Quizzes
Homework quizzes 1 - 7, Midterm already due
Homework 8 released later (Wednesday)
See WebCT at http://courses.mtu.edu/
Wikipedia entries:
HR Diagram
Cepheid variable
Open cluster
Globular cluster
4
Cepheid variable stars
Longer periods means greater
absolute brightness
See link:
http://www.youtube.com/watch?v=NNPAlAZ_iKY
5
Andromeda Nebula: Var!
Credit: Mount Wilson Observatory Historical Archive
APOD: 1996 April 6
The Cepheids of M100
Credit: NASA, HST, W. Freedman (CIW),
R. Kennicutt (U. Arizona), J. Mould (ANU)
APOD: 1996 January 10
Open Clusters
Young
< 1 billion years
Light dominated by biggest blue stars
10 – 1,000 stars
Found in Galactic Plane
All stars born at the same time
All stars at the same distance
M45: The Pleiades Star Cluster
Credit & Copyright: Robert Gendler
APOD: 2006 January 9
Perseid Fireball Over Japan
Credit & Copyright: Katsuhiro Mouri & Shuji Kobayashi
(Nagoya City Science Museum / Planetarium)
APOD: 2004 August 13
Open Cluster NGC 290: A Stellar Jewel Box
Credit: ESA & NASA; Acknowledgement: E. Olszewski (U. Arizona) HST
APOD: 2008 August 3
The M7 Open Star Cluster in Scorpius
Credit & Copyright: Allan Cook & Adam Block, NOAO, AURA, NSF
APOD: 2005 April 6
http://en.wikipedia.org/wiki/Image:Open_cluster_HR_diagram_ages.gif
In the Center of the Trapezium
Credit: J. Bally, D. Devine, & R. Sutherland, D. Johnson (CITA), HST, NASA
APOD: 2005 July 10
Star Clusters Young and Old
Credit & Copyright: Chris Hetlage
APOD: 2006 September 10
Open Star Clusters M35 and NGC 2158
Credit & Copyright: Canada-France-Hawaii Telescope,
J.-C. Cuillandre (CFHT), Coelum
APOD: 2003 December 15
A Star Cluster in Motion
Credit: Adam Block (NOAO)
APOD: 2002 July 30
The Rosette Nebula in Hydrogen, Oxygen, and Sulfur
Credit: T. A. Rector, B. Wolpa, M. Hanna (AURA/NOAO/NSF)
APOD: 2000 January 11
Inside the Eagle Nebula
Credit & Copyright: T. A. Rector & B. A. Wolpa, NOAO, AURA
APOD: 2006 February 26
Globular Clusters
Oldest things known in the universe
10,000 – 1 million stars
All born at the same time
All have the same distance
All are relatively dim
Not confined to our Galactic Plane
Blue stragglers once a mystery
The Colorful Clouds of Rho Ophiuchi
Credit: Adam Block, KPNO Visitor Program,
NOAO, AURA, NSF
APOD: 2007 September 3
Globular Cluster M3 from WIYN
Credit & Copyright: S. Kafka & K. Honeycutt (Indiana University), WIYN, NOAO, NSF
APOD: 2006 March 12
M3: Inconstant Star Cluster
Credit & Copyright: J. Hartman & K. Stanek (Harvard CfA)
APOD: 2004 October 12
M13: The Great Globular Cluster in Hercules
Credit & Copyright: Eddie Guscott
APOD: 2004 May 11
NGC 5139: Omega Centauri
Credit & Copyright: Martin Pugh
APOD: 2007 April 19
Blue Stragglers in NGC 6397
Credit: Hubble Heritage Team (STScI / AURA), A. Cool (SFSU) et al., NASA
APOD: 2003 August 8
NGC 1818: A Young Globular Cluster
Credit: Diedre Hunter (Lowell Obs.) et al., HST, NASA
APOD: 2002 December 29
M55: Color Magnitude Diagram
B.J. Mochejska, J. Kaluzny (CAMK), 1m Swope Telescope
APOD: 2001 February 23
The Sombrero Galaxy from HST
Credit: Hubble Heritage Team (AURA/STScI /NASA)
APOD: 2006 January 15
M13: The Great Globular Cluster in Hercules
Credit & Copyright: Eddie Guscott
APOD: 2004 May 11