Studies of the Properties of Blue Stragglers

Liu Guoqing

2006.04.14

Outline

MotivationThe progress and results of my workFuture steps of my work

MotivationBluer and more luminous than MS turnoff

Working sample: Blue stragglers in M67 Data from the 2.12-m Guillermo Haro Telescope, at Cananea, Mexico (May 25) Boller & Chivens spectrograph Cassegrain focus grating:150l/mm slit:250 3900~7000A Resolution:6.4A R=2500 gain:1.85 noise:3.7All the reduction has been finished with IRAF (July) ccdproc zerocombine flatcombine response imcombine cosmicrays apall identify sensfunc calibrate

9.38 0.045

Fundamental quantities:(1) Lick indices

Another way to calibrate

Fundamental quantities: (2) spectral fitting8790

Future steps of my workDerive the basic parameters of blue stragglers by Lick indices Analysis the intrinsic properties of blue stragglers Analysis the possible formation ways of blue stragglers Analysis the environment of stellar system

Thank you !