M. Y. Bouzid, C. Sterken, T. Arentoft, L. M. Freyhammer and S. Frandsen
We present light curves of 321 stars in the open cluster NGC1817. The data were obtained in a search for pulsating stars, mainly of the delta Scuti type, using CCD observations collected at the Nordic Optical Telescope at La Palma, Spain. 12 delta Scuti stars (11 of which could be confirmed as cluster members), 2 variables of unknown type and 2 eclipsing binary systems were found. We describe the observations, data reduction and colour-transformation procedures, and give the resulting light curves in tabular form. We also present sets of B and V stacked images obtained at low air masses.
Manuscript in pdf format: jad12_2.pdf
| Table or Frame | Description |
| TABLE1 | Common stars of NGC1817 North and South |
| TABLE2 | Log of the observations |
| TABLE3 | PSF Aperture factors for each star |
| TABLE4 | Instrumental Strömgren indices of NGC2506 used for standardisation. |
| TABLE5 | Instrumental Strömgren indices of M67 used for standardisation. |
| TABLE6 | The photometric-transformation coefficients |
| TABLE7 | Differences between our Strömgren photometry and Balaguer-Núñez et al. (2004) |
| TABLE8 | The instrumental Strömgren indices of NGC1817 |
| TABLE9 | Instrumental and standard Johnson B and V indices of NGC1817 |
| TABLE10 | Differences between the common stars in the standard and in the instrumental system. |
| TABLE11 | Differences between the common stars in Johnson B and V |
| TABLE12 | List of frames used for the standardisation |
| TABLE13 | List of stacked frames |
| TABLE14 | Equatorial coordinates for NGC1817 North (epoch 2000) in degrees |
| TABLE15 | Equatorial coordinates for NGC1817 South (epoch 2000) in degrees |
| NORTH_B | HJD, airmass and instrumental B magnitudes for all stars in NGC1817 North |
| NORTH_V | HJD, airmass and instrumental V magnitudes for all stars in NGC1817 North |
| SOUTH_B | HJD, airmass and instrumental B magnitudes for all stars in NGC1817 South |
| SOUTH_V | HJD, airmass and instrumental V magnitudes for all stars in NGC1817 South |
| FIG2L.FIT | Example of a frame before PSF subtraction (Fig. 2, left) |
| FIG2R.FIT | Example of a frame after PSF subtraction (Fig. 2, right) |