a search for a correlation between mass segregation and magnitude nick dipreta

A Search for a Correlation Between Mass Segregation and

MagnitudeNick 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>.

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

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

Mass Segregation

• Distributed by equipartition to a roughly equal kinetic state

• Kinetic energy exchange by two members of a star cluster

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

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BIG Santa Barbara Instrument Group, DSS 7 Picture , 14 May 2009 <http://www.sbig.com/dss7/dss7_25s.jpg>.

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