|
| | | | |
| | | |
| Stat |
Members: 3665
Articles: 2'599'751
Articles rated: 2609
21 January 2025 |
|
| | | | |
|
Article overview
| |
|
|
BATC 13-band Photometry of Open Cluster NGC 7789 | | Zhen-Yu Wu
; Xu Zhou
; Jun Ma
; Zhao-Ji Jiang
; Jian-Sheng Chen
; Jiang-Hua Wu
; | | Date: |
10 Jan 2007 | | Abstract: | 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 $1.4pm0.1$ Gyr, a distance modulus $(m-M)_{0}=11.27pm0.04$, a reddening $E(B-V)=0.28pm0.02$, 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 ($lambda_{ extrm{eff}}=4925$ AA) is fitted by King model, the core radius $R_{c}=7.52arcmin$ and the tidal radius $R_{t}=28.84arcmin$ 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 $phi(m)propto m^{alpha}$ and the slope $alpha=-0.96$ 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 $alpha$ in different spatial regions of the cluster: the MF for stars within the core region has $alpha=-0.71$, much flatter than that for stars in external regions of the cluster ($alpha=-1.20$). | | Source: | arXiv, astro-ph/0701282 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
|
| |
|
|
|
REGISTER