Star cluster group

Discussions

2015

2015.06.23

Li: 星團 IMF

PADOVA isochrone test

Zhong: M35 Proper Motion

PM+Spatial --> high prob. mem. comp. with LAMOST RV. (need phot info. to support the results)

2015.06.18

Lin: 跟中央大學談的合作事項。

1. PTF 在星團中的變星 -- 饒兆聰，楊庭彰 (造父變星、RR Ly)

2. NGC752 科學文章 -- 陳文屏 (蒸發、潮汐的成員，動力自行成員、金屬豐度)

3. 星團中的 Brown Dwarfs -- 陳文屏

2015.06.08

Lin: 說明用密度找PS1星團，分析距離年齡的方法。

整理出star cluster catalog以及Be star catalog。

Zhong: LAMOST在星團中的觀測還不足。

Li: 學習Chi-square fitting方法。

Catalogs

variable stars

Star cluster sample from (186) Dias et al. 2002[1] and (320) Kharchenko et al. 2013. [2] with age > 10^9 years and 0 < Dec < 80 deg.

be stars

NGC 663

SEARCHING FOR Be STARS IN THE OPEN CLUSTER NGC 663[3]
ABSTRACT
We present Be star candidates in the open cluster NGC663, identified by Hα imaging 
photometry with the Palomar Transient Factory Survey, as a pilot program to investigate 
how the Be star phenomena, the emission spectra, extended circumstellar envelopes, 
and fast rotation, correlate with massive stellar evolution. Stellar membership of the 
candidates was verified by 2MASS magnitudes and colors and by proper motions (PMs).  
We discover four new Be stars and exclude one known Be star from being a member due 
to its inconsistent PMs. The fraction of Be stars to member stars [N(Be)/N(members)] in 
NGC663 is 3.5%. The spectral type of the 34 Be stars in NGC663 shows bimodal peaks 
at B0–B2 and B5–B7, which is consistent with the statistics in most star clusters. 
Additionally, we also discover 23 emission-line stars of different types, including 
non-member Be stars, dwarfs, and giants.

bookmarks

Local Group Astrostatistics Conference http://dept.astro.lsa.umich.edu/lgastrostatistics/