| Issue |
A&A
Volume 426, Number 3, November II 2004
|
|
|---|---|---|
| Page(s) | 827 - 834 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20041333 | |
| Published online | 18 October 2004 | |
uvby–H
CCD photometry of NGC 1817 and NGC 1807
*,**
1
Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, 08028 Barcelona, Spain e-mail: Lola.Balaguer@am.ub.es
2
Shanghai Astronomical Observatory, CAS Shanghai 200030, PR China
3
Institute of Astronomy, Madingley Road, CB3 OHA Cambridge, UK
4
CER for Astrophysics, Particle Physics and Cosmology, associated with Instituto de Ciencias del Espacio-CSIC
5
Centro de Astrobiología (CSIC-INTA). Carretera de Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain
Received:
21
May
2004
Accepted:
5
July
2004
We have investigated the area of two NGC entries, NGC 1817 and NGC 1807,
with deep CCD photometry in the uvby–
intermediate-band system.
The photometric analysis of a selected sample of stars of the open
cluster NGC 1817 yields a
reddening value of 
= 
, a distance modulus of
= 
, a metallicity of [Fe/H] = 
and an age of 
= 
.
Our measurements allow us to confirm that NGC 1807 is
not a physical cluster.
Key words: Galaxy: open clusters and associations: individual: NGC 1817 / techniques: photometric / methods: observational / Galaxy: open clusters and associations: individual: NGC 1807 / methods: data analysis
© ESO, 2004
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