A Search for a Correlation Between Mass Segregation and Metallicity Nick DiPreta
Feb 26, 2016
A Search for a Correlation Between Mass Segregation and
MetallicityNick DiPreta
Goals• To measure properties of star clusters• To learn more about celestial analytic
techniques• To look for a correlation between metalicity
and mass segregation in star clustershttp://www.dpreview.com/news/9910/99102101superccd.asp>.
http://www.optcorp.com/product.aspx?pid=6316
Star Clusters• Held together by gravity (Batinelli,1991) • All same age, composition, and distance
from earth• 2 Types
<http://outreach.atnf.csiro.au/education/senior/astrophysics/images/stellarevolution/pleiadesuks018c.jpg>.
HR Diagram• observation
and stellar evolution
• From observations other facts can be derived.
• <http://www.bramboroson.com/astro/images/hrdiagram.jpg>.
Spectroscopy• Used to study properties of a star ex:
metalicity• Spectroscope-makes graph of intensity
<http://www.sbig.com/dss7/dss7_25s.jpg>.
• http://loke.as.arizona.edu/~ckulesa/camp/spectroscopy_intro.html>. http://www.astro.washington.edu/users/premap/images/project_images/solar_spectrum.jpg
Metalicity
• “metals” besides hydrogen and helium are looked for
• older star, several heavier elements
Heavy element cluster
http://apod.nasa.gov/apod/image/0711/pleiades_fs_big.jpg
Photometry• Luminosity• CCD imager- longer exposures better images• filters• APT- image J
http://teleskop-service.se/produkter/eng/atikpics/start/mit-rgb-2.jpg>.http://teleskop-service.se/produkter/eng/atikpics/start/mit-rgb-2.jpg>.
Image Stacking• Spectrograph/CCD create image• Stacking images increases quality• Photoshop/MaxIm DL http://teleskop-service.se/produkter/eng/atikpics/start/mit-rgb-2.jpg>.
Astroimaging/Preprocessing
• Darks• Bias• Flats• Signal to noise ratio
http://apod.nasa.gov/apod/image/0711
Mass Segregation
• Distributed by equipartition to a roughly equal kinetic state
• Kinetic energy exchange by two members of a star cluster
http://images.google.massssegregation
Prim’s Algorithm
• Allows us to calculate the MST or Minimum Spanning Tree
Wikipedia.org/wiki/minimumspanningtree
Using The Minimum Spanning Tree to Trace Mass Segregation
In 2009, Richard J. Allsion found a way to quantify mass segregation .
Literature
Bruce Elmegreen et Al. 2002
Mass segregation patterns were investigated.
Claimed that more segregation occurred in areas with greater gravity.
Observations and Theory of Star Cluster Formation
• D. Raboud et Al., 1997
• Claims that other factors such as age and primordial protoplanetary disk composition may be directly responsible for mass segregation
Candidate Clusters• Pleiades- M45• Beehive Cluster- M44• Perseus Double Cluster-NGC
869 884 • The Butterfly Cluster or M6• M34• M35• M47• M46• Jewel Box Cluster- NGC 4755• Ptolemy Cluster- M7
MethodologyCandidates Clusters
Images obtained using CCD imager.
Images processed and sharpened using MaxIm DL
MST calculated using Prim algorithm
Mass Segregation Formula by Richard J Allison
Pearson function will be used to search for correlation between Metalicity and Mass Segregation
Spectroscopy performed using Spectroscope
Trigonometry functions used to find distance between stars
Do-Ability
• Materials are readily available – Computer– CCD imager– DSS7 spectrograph– Telescope
Cost/Budget
Equipment CostCCD ImagerMaxIm DL
$1895$665 http://www.cyanogen.com/maximdl_buy.php
Http://www.sbig.com/sbwhtmls/online.htm Site/Supplier
1595 http://www.optcorp.com/product.aspx?pid=6316DSS7
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• http://www.optcorp.com/product.aspx?pid=6316• http://www.cyanogen.com/maximdl_buy.php Http://www.sbig.com/sbwhtmls/online.htm