PH1600: Introductory Astronomy - APOD

PH1600: Introductory Astronomy - APOD

What is this? PH1600: Introductory Astronomy Lecture 14: Stars: Single and Binary PH1600: Introductory Astronomy Lecture 14: Star: Single and Binary

Next Lecture: Star Clusters 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 - 6, Midterm already due Homework 7 due later (Monday) by 5 pm

See WebCT at http://courses.mtu.edu/ Wikipedia entries:

Stars Annie Jump Cannon Stellar Classification Binary star Inverse-square law

4 Henrietta Leavitt Calibrates the Stars Credit: AAVSO APOD: 2000 September 3

Stars: Distant Suns Annie Jump Cannon http://en.wikipedia.org/wiki/Annie_Jump_Cannon 6

Stellar Spectral Types: OBAFGKM Credit & Copyright: KPNO 0.9-m Telescope, AURA, NOAO, NSF APOD: 2004 April 18 http://en.wikipedia.org/wiki/Image:Hertzsprung-Russell_diagram_Richard_Powell.png http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html

http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html http://en.wikipedia.org/wiki/OBAFGKM Star sizes video on youtube:

http://www.youtube.com/watch?v=pZt-aUU0cLI 1 2 http://abyss.uoregon.edu/~js/ast122/lectures/lec11.html

Orion Star Colors Credit and Copyright: David Malin APOD: 1998 August 29 Famous Stars

Sun Polaris

Sirius Betelgeuse Alpha Centauri

North star Proxima Centauri

Nemiroffs Star Just kidding Polaris: The North Star Credit & Copyright: Wally Pacholka

APOD: 1999 October 6 Watch the Sky Rotate : Diurnal Motion http://antwrp.gsfc.nasa.gov/apod/ap010110.html

Star Trails Above Mauna Kea Credit & Copyright: Peter Michaud (Gemini Observatory), AURA, NSF APOD: 2005 December 20 11 Hour Star Trails

Credit & Copyright: Josch Hambsch APOD: 2006 September 15 Warped Sky: Star Trails Panorama Credit & Copyright: Peter Ward APOD: 2007 June 13

Sirius: The Brightest Star in the Night Credit & Copyright: Juan Carlos Casado APOD: 2000 June 11 X-Rays From Sirius B Credit: NASA/ CXC/ SAO APOD: 2000 October 6

Resolving Mira Credit: M. Karovska (Harvard-Smithsonian CfA) et al., FOC, ESA, NASA APOD: 2001 January 21 A Giant Starspot on HD 12545 Credit & Copyright: K. Strassmeier (U. Wien),

Coude Feed Telescope, AURA, NOAO, NSF APOD: 2003 November 2 Betelgeuse, Betelgeuse, Betelgeuse Credit: A. Dupree (CfA), R. Gilliland (STScI), NASA APOD: 1999 June 5

Simulated Supergiant Star Credit: B. Freytag, (U. Uppsala) APOD: 2000 December 22 Why Stars Twinkle Credit: Applied Optics Group (Imperial College), Herschel 4.2-m Telescope APOD: 2000 July 25

Inverse Square Law of Brightness http://en.wikipedia.org/wiki/Image:InverseSquareLaw.png http://en.wikipedia.org/wiki/Inverse-square_law

2 9 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. Proxima Centauri: The Closest Star Credit & Copyright: David Malin, UK Schmidt Telescope, DSS, AAO APOD: 2002 July 15

Alpha Centauri: The Closest Star System Credit: 1-Meter Schmidt Telescope, ESO APOD: 2003 March 23 Binary Stars

Visual Binaries Spectroscopic binaries

Doppler color changes Eclipsing Binaries

Can see two or more Dark times

Astrometric Binaries Single star wobble Albireo: A Bright and Beautiful Double Credit & Copyright: Richard Yandrick (Cosmicimage.com)

APOD: 2005 August 30 http://en.wikipedia.org/wiki/Image:Orbit5.gif The Big Dipper Cluster Credit & Copyright: Noel Carboni APOD: 2006 March 17

Mizar Binary Star Credit: J. Benson et al., NPOI Group, USNO, NRL APOD: 1997 February 19 http://csep10.phys.utk.edu/astr162/lect/binaries/spectroscopic.html

http://en.wikipedia.org/wiki/Eclipsing_binary Mira: The Wonderful Star Illustration Credit: M.Weiss(CXC) APOD: 2005 May 5 Resolving Mira

Credit: M. Karovska (Harvard-Smithsonian CfA) et al., FOC, ESA, NASA APOD: 2001 January 21 Mira Over Germany Credit & Copyright: Stefan Seip (AstroMeeting.de) APOD: 2007 4February 21

2 NGC 3132: The Eight Burst Nebula Credit: Hubble Heritage Team (AURA/STScI /NASA) APOD: 2003 September 13 The Case of the Very Dusty Binary Star

Illustration Credit & Copyright: Lynette Cook APOD: 2008 September 25 4 4 An Intermediate Polar Binary System

Illustration Credit & Copyright: Mark Garlick (Space-art) APOD: 2003 November 10

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