BATC 13-band Photometry of Open Cluster NGC 7789
| dc.creator | Wu, Zhen-Yu | |
| dc.creator | Zhou, Xu | |
| dc.creator | Ma, Jun | |
| dc.creator | Jiang, Zhao-Ji | |
| dc.creator | Chen, Jian-Sheng | |
| dc.creator | Wu, Jiang-Hua | |
| dc.date | 2007-01-10 | |
| dc.date.accessioned | 2026-07-07T11:20:57Z | |
| dc.date.available | 2026-07-07T11:20:57Z | |
| dc.description | We present 13-band CCD intermediate-band spectrophotometry of a field centered on the open cluster NGC 7789 from 400 to nearly 1000 nm, taken with Beijing-Arizona-Taiwan-Connecticut (BATC) Multi-Color Survey photometric system. By comparing observed spectral energy distributions of NGC 7789 stars with theoretical ones, the fundamental parameters of this cluster are derived: an age of $1.4\pm0.1$ Gyr, a distance modulus $(m-M)_{0}=11.27\pm0.04$, a reddening $E(B-V)=0.28\pm0.02$, and a metallicity with the solar composition $Z=0.019$. When the surface density profile for member stars with limiting magnitudes of 19.0 in the BATC $e$ band ($λ_{\textrm{eff}}=4925$ Å) is fitted by King model, the core radius $R_{c}=7.52\arcmin$ and the tidal radius $R_{t}=28.84\arcmin$ are derived for NGC 7789. The observed mass function (MF) for main sequence stars of NGC 7789 with masses from 0.95 to 1.85 $M_{\odot}$ is fitted with a power-law function $ϕ(m)\propto m^α$ and the slope $α=-0.96$ is derived. Strong mass segregation in NGC 7789 is reflected in the significant variation of the concentration parameters $C_{0}=\log (R_{t}/R_{c})$ for member stars of NGC 7789 within different mass ranges: $C_{0}=1.02$ for most of massive stars; $C_{0}=0.37$ for the lowest-mass MS stars. Strong mass segregation in NGC 7789 is also indicated in the significant variation of the slopes $α$ in different spatial regions of the cluster: the MF for stars within the core region has $α=-0.71$, much flatter than that for stars in external regions of the cluster ($α=-1.20$). | |
| dc.description | 24 pages. AJ accepted | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0701282 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0701282 | |
| dc.identifier | Astron.J.133:2061-2071,2007 | |
| dc.identifier | doi:10.1086/512189 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/194121 | |
| dc.subject | Astrophysics | |
| dc.title | BATC 13-band Photometry of Open Cluster NGC 7789 | |
| dc.type | text |