| Title | Colour-magnitude diagrams of star clusters in the Magellanic Clouds from wide-field electronography. III. NGC 1841. |
| Authors | Andersen, J.; Blecha, A.; Walker, M. F. |
| Bibcode | 1987MNRAS.229....1A Search ADS ↗ |
| Abstract | The colour-magnitude diagram (CMD) of NGC 1841, an outlying globular cluster in the Magellanic System has been constructed from electronographic photometry of 390 stars in the annular field 22 arcsec < R < 72 arcsec to a limit of about V=22.5. Examination of a control field near NGC 1841 shows field star contamination of the cluster CMD to be unimportant. The detailed CMD confirms earlier classifications of NGC 1841, based on its integrated colours and on photographic photometry of lower precision and completeness, as belonging to the oldest and most metal-poor population of the Magellanic System. For an adopted reddening of E(B-V)=0.15, the CMD of NGC 1841 closely matches that of the galactic globular cluster M 92 indicating that the two clusters are of similar age and metal abundance, in agreement with previous spectroscopic studies. The fit of the two CMDs yields a distance modulus to NGC 1841 of (m-M)0= 18.1 ± 0.3. This places NGC 1841 within the disc system formed by the other old LMC clusters - some 10 kpc from the centre of the LMC itself - in contrast to earlier results placing it well beyond the LMC. It also eliminates the previous discrepancy between the luminosities of its giant stars and similar Galactic globular cluster giants. |
| Objects | 3 Objects Search NED ↙ |
