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PH1600: Introductory AstronomyLecture 14: Stars: Single and Binary
What is this?
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PH1600: Introductory AstronomyLecture 14: Star: Single and BinaryStudy: Chapter 11 in The Cosmos book Next Lecture: Star Clusters
School: Michigan Technological UniversityProfessor: Robert Nemiroff
Book: The Cosmos by Pasachoff & FilippenkoOnline Course WebCT pages:
http://courses.mtu.edu/
This class can be taken online ONLY, class attendance is not required!
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You are responsible for…
Reading the book One chapter per “quiz period” Anything from that chapter can appear on
quizzes or tests, even if I never mention them during my lecture(s)
This quiz period covers Chapter 11 APODs posted during the semester
APOD review every week during lecture Completing the Quizzes
Chapter 1, 2, 4, 6, 7, 8, &10 quizzes already due
Chapter 11 quiz due next See WebCT at http://courses.mtu.edu/ for
details
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Stars: Distant Suns
Henrietta Leavitt Calibrates the StarsCredit: AAVSO
APOD: 2000 September 3
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Stellar Spectral Types: OBAFGKMCredit & Copyright: KPNO 0.9-m Telescope, AURA, NOAO, NSF APOD: 2004 April 18
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http://upload.wikimedia.org/wikipedia/en/4/44/HRDiagram.gif
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http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html
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http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html
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http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html
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Orion Star ColorsCredit and Copyright: David Malin
APOD: 1998 August 29
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Famous Stars
Sun Polaris
North star Sirius Betelgeuse Alpha Centauri
Proxima Centauri
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Polaris: The North StarCredit & Copyright: Wally Pacholka APOD: 1999 October 6
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Sirius: The Brightest Star in the NightCredit & Copyright: Juan Carlos Casado APOD: 2000 June 11
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X-Rays From Sirius BCredit: NASA/ CXC/ SAO APOD: 2000 October 6
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Resolving MiraCredit: M. Karovska (Harvard-Smithsonian CfA) et al., FOC, ESA, NASA APOD: 2001 January 21
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A Giant Starspot on HD 12545Credit & Copyright: K. Strassmeier (U. Wien), Coude Feed Telescope, AURA, NOAO, NSF APOD: 2003 November 2
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Betelgeuse, Betelgeuse, BetelgeuseCredit: A. Dupree (CfA), R. Gilliland (STScI), NASA
APOD: 1999 June 5
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Simulated Supergiant StarCredit: B. Freytag, (U. Uppsala)
APOD: 2000 December 22
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Why Stars TwinkleCredit: Applied Optics Group (Imperial College), Herschel 4.2-m Telescope APOD: 2000 July 25
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Inverse Square Law of Brightness
http://en.wikipedia.org/wiki/Image:InverseSquareLaw.png
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Example
Stars A and B are identical. Star B is at twice the distance of star A. How much brighter does star A appear than star B?
Use inverse square law: lA =k/rA2
Also, lB=k/rB2. Therefore lA/lB=(rB/rA)2 =
22 = 4.
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Proxima Centauri: The Closest StarCredit & Copyright: David Malin, UK Schmidt Telescope, DSS, AAO APOD: 2002 July 15
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Alpha Centauri: The Closest Star SystemCredit: 1-Meter Schmidt Telescope, ESO APOD: 2003 March 23
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Binary Stars
Visual Binaries Can see two or more
Spectroscopic binaries Doppler color changes
Eclipsing Binaries Dark times
Astrometric Binaries Wobble
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Albireo: A Bright and Beautiful DoubleCredit & Copyright: Richard Yandrick (Cosmicimage.com)APOD: 2005 August 30
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http://en.wikipedia.org/wiki/Image:Orbit5.gif
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The Big Dipper ClusterCredit & Copyright: Noel Carboni APOD: 2006 March 17
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Mizar Binary StarCredit: J. Benson et al., NPOI Group, USNO, NRL
APOD: 1997 February 19
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http://csep10.phys.utk.edu/astr162/lect/binaries/spectroscopic.html
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http://en.wikipedia.org/wiki/Eclipsing_binary
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Mira: The Wonderful StarIllustration Credit: M.Weiss(CXC)APOD: 2005 May 5
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NGC 3132: The Eight Burst NebulaCredit: Hubble Heritage Team (AURA/STScI /NASA)APOD: 2003 September 13
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An Intermediate Polar Binary SystemIllustration Credit & Copyright: Mark Garlick (Space-art)APOD: 2003 November 10