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- Q1045478 subject Q1031119.
- Q1045478 subject Q7215999.
- Q1045478 abstract "NGC 1817 is an open cluster of stars in the constellation Taurus. It was discovered by English astronomer William Herschel in February 1784. With an apparent magnitude of 7 and spanning 17 arc minutes across the sky, it is separated from the NGC 1807 cluster by just a few degrees. Indeed, the two may actually be parts of a single extended cluster.The NGC 1817 cluster is around the same age as the Hyades, or perhaps a little younger at 0.8−1.2 billion years. The turnoff point for this cluster—where stars above a certain mass are evolving through the red giant stage—is twice the mass of the Sun. The cluster is situated in the opposite side of the sky from the Galactic Core at a separation of 32 kly (9.9 kpc) from the core, and is around 1.3 kly (0.4 kpc) away from the Galactic plane.Measurements of the proper motion of 810 stars within a 1.5° region centered on the cluster suggest that it has at least 169 members. Of these, there is a total of 26 variable stars, including three candidate Gamma Doradus variable stars and sixteen Delta Scuti variables. This unusually high proportion of Delta Scuti variables is likely the result of the turnoff point being located within the instability strip.".
- Q1045478 wikiPageWikiLink Q1031119.
- Q1045478 wikiPageWikiLink Q1045427.
- Q1045478 wikiPageWikiLink Q10570.
- Q1045478 wikiPageWikiLink Q11387.
- Q1045478 wikiPageWikiLink Q13511.
- Q1045478 wikiPageWikiLink Q14277.
- Q1045478 wikiPageWikiLink Q1493194.
- Q1045478 wikiPageWikiLink Q193223.
- Q1045478 wikiPageWikiLink Q22066400.
- Q1045478 wikiPageWikiLink Q2661779.
- Q1045478 wikiPageWikiLink Q2703.
- Q1045478 wikiPageWikiLink Q280157.
- Q1045478 wikiPageWikiLink Q4461574.
- Q1045478 wikiPageWikiLink Q50081.
- Q1045478 wikiPageWikiLink Q6243.
- Q1045478 wikiPageWikiLink Q6472.
- Q1045478 wikiPageWikiLink Q649112.
- Q1045478 wikiPageWikiLink Q7215999.
- Q1045478 wikiPageWikiLink Q836976.
- Q1045478 wikiPageWikiLink Q8928.
- Q1045478 comment "NGC 1817 is an open cluster of stars in the constellation Taurus. It was discovered by English astronomer William Herschel in February 1784. With an apparent magnitude of 7 and spanning 17 arc minutes across the sky, it is separated from the NGC 1807 cluster by just a few degrees. Indeed, the two may actually be parts of a single extended cluster.The NGC 1817 cluster is around the same age as the Hyades, or perhaps a little younger at 0.8−1.2 billion years.".
- Q1045478 label "NGC 1817".