NGC 6819 is an open cluster (commonly known as an "open star cluster") located 7,200 light years away in the Cygnus constellation. It was discovered by Caroline Herschel on 12 May 1784. Situated on the boundary of Cygnus and Lyra, NGC 6819 contains roughly two dozen stars of magnitude 10 to 12, with many more lower magnitude members.

2018年5月1日 · NGC 6819 is one of the four open clusters in the Kepler field of view. It is located in the galactic plane, with Right Ascension of 19 hr 39 min 36 s and Declination of +40 o 04′. It has an age of 2.5 Gyr (Basu et al., 2011) and super-solar metallicty of [Fe/H] = +0.09 ± 0.03 (Bragaglia et al., 2001) and reddening of 0.15.

NGC 6819 is a Open Cluster in the Cygnus constellation. NGC 6819 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere. Given its visual magnitude of 7.3, NGC 6819 is visible with the help of a small binocular.

NGC 6819 is a Trumpler-type I1r open star cluster with an apparent visual magnitude of about seven. The distance is estimated at about 2.4 kpc (about 7800 light years) and the age at 2.4 billion years. The metallicity is about that of the Sun and the mass of …

Abstract: Using photometry from the Kepler Input Catalogue, we determine the distance and age of NGC 6819 using several different methods. From isochrone fitting we find the age of the cluster to be about 2.5 Gyr.

2016年2月18日 · Stellar rotation measurements have been used to examine the gyrochronological ages of two of the four open clusters in the Kepler field: NGC 6811 (Meibom et al. 2011) and NGC 6819 (Meibom et al. 2015).

2016年1月15日 · As part of our study of the old (~2.5 Gyr) open cluster NGC 6819 in the Kepler field, we present photometric (Kepler and ground-based BVRcIc) and spectroscopic observations of the detached eclipsing binary WOCS 24009 (Auner 665; KIC 5023948) with a short orbital period of 3.6 days.

2013年2月20日 · There are four open clusters in the Kepler field of view: NGC 6811, NGC 6819, NGC 6791 and NGC 6866. Kepler studies of pulsating red giants in these clusters allow independent estimates of mass, radius and surface gravity of each star. In these stars the large separation (i.e. the frequency separation between modes of the same spherical ...

2002年10月31日 · A 3 minute exposure with an ST-9E CCD camera thru Kopernik's 20-inch F/8.1 Ritchey Chretien Cassegrain telescope. The field of view is about 8x8 arc minutes, with North at the top. "Cluster, very large, very rich in stars, stars of magnitude 11 to 15." "Moderately rich in stars; small brightness range; strong central concentration; detached.

2015年3月9日 · High-dispersion spectra of 333 stars in the open cluster NGC 6819, obtained using the HYDRA spectrograph on the WIYN 3.5 m telescope, have been analyzed to determine the abundances of iron and other metals from lines …