Batc multi color photometry of open cluster m48
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BATC Multi-color Photometry of Open Cluster M48. Zhenyu Wu 8.11, 2005, Weifang. Open clusters in Milky Way. Number of clusters: 1690 Clusters with Diameters: 1688 (99.9%) Clusters with Distances: 740 (43.8%)

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BATC Multi-color Photometry of Open Cluster M48

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Batc multi color photometry of open cluster m48

BATC Multi-color Photometry of Open Cluster M48

Zhenyu Wu

8.11, 2005, Weifang


Open clusters in milky way

Open clusters in Milky Way

  • Number of clusters: 1690

  • Clusters with Diameters: 1688 (99.9%)

  • Clusters with Distances: 740 (43.8%)

  • Clusters with Reddening: 721 (42.7%)

  • Clusters with Ages: 608 (36.0%)

  • Clusters with Dist,Redd.and Ages: 594 (35.1%)

  • Clusters with Proper motions: 614 (36.3%)

  • Clusters with Radial velocities: 227 (13.4%)

  • Clusters with P.Motions + RVs: 217 (12.8%)

  • Clusters with Dist,Ages,PMS and RVs 214 (12.7%)

  • Clusters with Abundances: 131 ( 7.8%)


The basic parameters of m48

The basic parameters of M48

  • Distance: 530 pc — 770 pc

  • E(B-V): 0.03 — 0.06

  • [Fe/H]: 0.0 — 0.1

  • Age: 0.30 Gyr — 0.40 Gyr


Observation

Observation

  • BATC photometric system with 60/90 cm Schmidt telescope of NAOC

  • 2048×2048 CCD, 58' × 58' field of view

  • 13 filters are used: b, c, d, e, f, g, h, i, j, k, m, n, o, p


Theoretical model

Theoretical model

  • Padova 2000 model

  • Age (Log(t)): 6.3 — 10.25

  • Metallicity Z: 0.0、0.0001、0.0004、0.001、0.004、0.008、0.019、0.03

  • Mass of stellar:0.15 - 120 M⊙


Method

Method

  • SED fitting between observations and theoretical models

  • Stellar sample: memberships of cluster

  • The deviation of observation and model for each cluster star is calculated

  • The total deviation of all cluster stars is calculated

  • The basic parameters of cluster can be derived by search model for which the total deviation has the minimum


Error analysis

Error analysis

  • 0.05 photometric error for each filter is assumed

  • Error of Distance: 10pc

  • Error of E(B-V): 0.01

  • Error of Log(t): 0.05

  • Error of [Fe/H]=0.0


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