The distance to the young cluster NGC 7129 and its age
| Autor: | J. Zdanavičius, Algirdas Kazlauskas, K. Zdanavičius, M. Maskoliūnas, V. Laugalys, R. P. Boyle, P. G. Prada Moroni, Emanuele Tognelli, V. Straižys |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
extinction Infrared ISM: individual objects: TGU H645 P2 FOS: Physical sciences Astronomy Dust Open clusters and associations: individual: NGC 7129 Astronomy and Astrophysics Astrophysics Stellar classification Astrophysics - Astrophysics of Galaxies ISM: clouds Photometry (optics) Stars Distance modulus Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Dust extinction Stars: fundamental parameters Open cluster |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 438:1848-1855 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stt2334 |
| Popis: | The dust cloud TGU H645 P2 and embedded in it young open cluster NGC 7129 are investigated using the results of medium-band photometry of 159 stars in the Vilnius seven-colour system down to V = 18.8 mag. The photometric data were used to classify about 50 percent of the measured stars in spectral and luminosity classes. The extinction A_V vs. distance diagram for the 20x20 arcmin area is plotted for 155 stars with two-dimensional classification from the present and the previous catalogues. The extinction values found range between 0.6 and 3.4 mag. However, some red giants, located in the direction of the dense parts of the cloud, exhibit the infrared extinction equivalent up to A_V = 13 mag. The distance to the cloud (and the cluster) is found to be 1.15 kpc (the true distance modulus 10.30 mag). For determining the age of NGC 7129, a luminosity vs. temperature diagram for six cluster members of spectral classes B3 to A1 was compared with the Pisa pre-main-sequence evolution tracks and the Palla birthlines. The cluster can be as old as about 3 Myr, but star forming continues till now as witnessed by the presence in the cloud of many younger pre-main-sequence objects identified with photometry from 2MASS, Spitzer and WISE infrared surveys. Comment: 8 pages, 6 fugures, full Table 1 online. Accepted for publication in MNRAS on 2013 November 30 |
| Databáze: | OpenAIRE |
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