Star cluster group

Discussions

2015

2015.11.25

觀測

2015.06.30

Zhang: 討論paper

• Fitting isochrones to open cluster photometric data. A new global optimization tool [1]
• Shao : 文章大致翻了一下，还没仔细看，感觉CE方法的重点是如何找到最佳“拟合”，与Bayes方法不完全是一个概念。而且CE方法，或者这篇文章最好是有人精读以后讲一下，是不是可以放在明天中午的组内讨论上讲，然后再讨论。另外，我可以简单介绍一下Bayes方法的概念，这样有一个比较，可以看出各自关心的重点和方法上的特点。另外，这篇文章中值得参考的是likelihood和weighting的取法，这个与参数求解过程无关，是可以借鉴的。

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。

• PTF 在星團中的變星 -- 饒兆聰，楊庭彰 (造父變星、RR Ly) Star_cluster_group#variable_stars
• 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)
• 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。

Star Clusters

in APGOEE

https://trac.sdss.org/wiki/APOGEE2#ClusterstarsinAPOGEEpreviouslySpecialTargetsStarClusterCalibration
DR12 APOGEE Total Survey Visits [2]

NOTE

• DR13 path [3]
• The current plan for DR13 is to have a public data release of all of APOGEE-1 data with improvements made since DR12 in July 2016. This public release will not have any APOGEE-2 data.
• ASPCAP => APOGEE Stellar Parameters and Chemical Abundances Pipeline
• CORE TARGETING PLAN FOR APOGEE-2 [4]
• https://data.sdss.org/sas/apogeework/apogee/spectro/redux/r6/stars/cal/clust.html

in Pan-STARRS

• ps1-flags

Catalogs

Star clusters

collections

1995-mel95-1756.txt  Mermilliod,  http://www.univie.ac.at/webda/navigation.html WEBDA Navigation
1997-har97-0157.txt  Harris,      VII/202                                        Globular Clusters in the Milky Way (Harris, 1997)
2002-dia02-2167.txt  Dias,        B/ocl                                          Optically visible open clusters and Candidates (Dias+ 2002-2014)
2003-bia03-0276.txt  Bica,        J/A+A/397/177                                  IR star clusters and stellar groups catalog (Bica+, 2003)
2003-bib03-0167.txt  Bica,        J/A+A/404/223                                  2MASS IR star clusters in the Galaxy (Bica+, 2003)
2003-dut03-0179.txt  Dutra,       J/A+A/400/533                                  New infrared star clusters in southern Milky Way (Dutra+, 2003) 
2007-fro07-1021.txt  Froebrich,   J/MNRAS/374/399                                Infrared star clusters with |b|<20° (Froebrich+, 2007)
2009-glu09-0194.txt  Glushkova,   V/132                                          SAI Open Clusters Catalog (Glushkova+, 2009)
2010-fro10-0269.txt  Froebrich,   J/MNRAS/409/1281/appena                        Old star clusters in the FSR catalogue (Froebrich+, 2010)
2011-buk11-0849.txt  Bukowiecki,  http://www.home.umk.pl/~gmac/OCS/2mass.html   Open Clusters in 2MASS Photometry
2013-kha13-3006.txt  Kharchenko,  J/A+A/558/A53                                  Milky Way global survey of star clusters. II. (Kharchenko+, 2013)
2014-sch14-0139.txt  Schmeja,     J/A+A/568/A51                                  Milky Way global survey of star clusters. III. (Schmeja+, 2014)
===================================================================================================================================================
2015-lin15-all.txt   4219                                                        Merge all star cluster catalogs

variable stars

Star cluster sample from (186) Dias et al. 2002[5] and 
(320) Kharchenko et al. 2013. [6] with age > 10^9 years and 0 < Dec < 80 deg.

Be stars

collections

1918-hd1catalog.fits III/135A                          Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989) 272150 rows
1995-hd2catalog.fits III/182                           HDE Charts: positions, proper motions (Nesterov+ 1995)  88883 rows
=============================================================================================================================================
1982-jas82-1159.txt  III/67A                           Catalogue of Be stars
1997-koh97-4174.txt  III/205                           H-alpha Stars in Northern Milky Way
2001-yud01-0628.txt  J/A+A/368/912                     Polarization and rotational velocities of Be stars
2002-men02-1019.txt  J/A+A/393/887                     SMC Be stars candidates
2005-sab05-2446.txt  J/MNRAS/361/1055                  BVI photometry of LMC Be stars
2005-zha05-1185.txt  J/other/NewA/10.325               2MASS observations of Be stars 
2006-wis06-0530.txt  J/ApJ/652/458                     BVRHα photometry of candidates Be stars
2007-nei07-2072.txt  http://basebe.obspm.fr/basebe/   The BeSS database contains the complete catalog of CBe stars and Herbig Ae/Be stars
2007-wis07-0368.txt  J/ApJ/671/2040                    Polarisation of candidates Be stars
2009-mcs09-0296.txt  J/ApJ/700/1216                    Spectroscopy of Be stars in open clusters
2010-sil10-0069.txt  J/ApJS/187/228                    Hα profiles of Be stars 
2011-mat11-0150.txt  J/other/BASI/39.517               Spectroscopy of classical Be stars
2012-mar12-0104.txt  J/AJ/144/158                      Properties of B and Be stars in h and χ Persei
2012-pau12-0102.txt  J/MNRAS/421/3622/stars            Candidate Be stars in the Magellanic Clouds
2013-cat13-0049.txt  J/A+A/550/A79/stars               Hα and Hβ lines of northern Be stars
2014-sab14-0213.txt  J/PASP/126/219                    Southern Galactic Be star candidates
2015-cho15-0261.txt  J/AJ/149/7                        SDSS-III/APOGEE. I. Be stars
2015-lin15-0180.txt  2015arXiv150507290L               Searching for Classical Be Stars from the LAMOST DR1          
2015-rad15-0248.txt  J/MNRAS/446/274                   A deep catalogue of classical Be stars
2015-yup15-0058.txt  2015AJ....149...43Y               Searching for Be Stars in the Open Cluster NGC 663
=============================================================================================================================================
2015-lin15-all.txt   11266                             Merge all Be star catalogs

APOGEE1&2

https://trac.sdss.org/wiki/APOGEE2/BeStars

LAMOST DR1&DR2

Searching for Classical Be Stars in LAMOST DR1 [7]
We report on searching for Classical B-type emission-line (CBe) stars 
in the first data release of the Large Sky Area Multi-Object fiber 
Spectroscopic Telescope (LAMOST; also called the Guo Shou Jing Telescope). 
A total of 192 objects (including 12 previously known CBes) were identified as 
CBes with prominent He~I~$\lambda4387$, He~I~$\lambda4471$ and 
Mg~II~$\lambda4481$ absorption lines, as well as H$\beta$~$\lambda4861$ and 
H$\alpha$~$\lambda6563$ emission lines.  These candidates significantly 
increases the currently known sample of CBes by about 8\%.  Most of the CBe  
candidates are distributed near the Galactic Anti-Center due to the observing  
strategy used for LAMOST.  Only two of CBes are in star clusters.  These two
CBes have ages of 15.8 and 398~Myr, respectively.

NGC 6830

REPORTING OF NEWLY DISCOVERED BE STARS IN THE OPEN CLUSTER NGC6830 (in prep.)
ABSTRACT
We discovered 2 new Be stars, and re-identified one known Be star in the open 
cluster NGC 6830. Eleven Hα emitters were discovered using the Hα imaging 
photometry of the Palomar Transient Factory Survey. Stellar membership of the 
candidates was verified with photometric and kinematic information using 2MASS 
data and proper motions. The spectroscopic confirmation was carried out by using 
the Shane 3-m telescope at Lick observatory. Based on their spectral types, three 
Hα emitters were confirmed as Be stars with the Hα equivalent widths > −10A. 
Two objects were also observed by the new spectrograph SED-Machine on the 
Palomar 60 inch Telescope. The SED-Machine results show strong Hα emission 
lines, which are consistent with the results of the Lick observations. The high 
efficiency of the SED-Machine can provide rapid observations for Be stars in a 
comprehensive survey in the future.

NGC 663

SEARCHING FOR Be STARS IN THE OPEN CLUSTER NGC 663[8]
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.

Brown dwarfs

Candidates in the LAMOST by 王有芬

Bookmarks

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

Members

Chen Li <chenli@shao.ac.cn>
Zhengyi Shao <zyshao@shao.ac.cn>
Zhong Jing <jzhong@shao.ac.cn>
Jinliang Hou <houjl@shao.ac.cn>
Li Lu<lilu@shao.ac.cn>
Li Yang<liyang@shao.ac.cn>
Chaolii Zhang<jackzcl@outlook.com>