Astronomy:NGC 5897
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Short description: Globular cluster in the constellation Libra
| NGC 5897 | |
|---|---|
 The globular cluster NGC 5897 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Class | XI[1] |
| Constellation | Libra |
| Right ascension | 15h 17m 24.40s[2] |
| Declination | −21° 00′ 36.4″[2] |
| Distance | 24.1 kly (7.4 kpc)[2] |
| Apparent magnitude (V) | 8.52[2] |
| Physical characteristics | |
| Radius | 6.3' x 6.3'[3] |
| Metallicity | [math]\displaystyle{ \begin{smallmatrix}\left[\ce{Fe}/\ce{H}\right]\end{smallmatrix} }[/math] = -2.04±0.15[4] dex |
| Other designations | GCl 33, C 1514-208[2] |
NGC 5897 is a globular cluster in the constellation Libra. This satellite of the Milky Way, which is quite remote (located about 41,000 light years away), has a diameter of over 170 light years. With its Shapley–Sawyer Concentration Class of XI, it has very low star density even in its center.[3]
The stars of the cluster have only 0.91% of the Sun's metallicity,[5] while the abundance of elements produced by the alpha process is roughly 5 times larger.[4] This means that the cluster formed in a time before the galaxy formed a disk and spiral arms. However, some of the stars are apparently younger, indicating multiple star-forming epochs.[4]
NGC 5897 has a diameter of 12.6 arcminutes and an apparent magnitude of 8.5.
References
- ↑ Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin 849 (849): 11–14, Bibcode: 1927BHarO.849...11S.
- ↑ 2.0 2.1 2.2 2.3 2.4 "NGC 5897". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5897.
- ↑ 3.0 3.1 "NGC 5897". http://spider.seds.org/spider/MWGC/n5897.html.
- ↑ 4.0 4.1 4.2 Koch, Andreas; McWilliam, Andrew (2014), "The chemical composition of a regular halo globular cluster: NGC 5897", Astronomy & Astrophysics 565: A23, doi:10.1051/0004-6361/201323119
- ↑ "A Galactic Globular Clusters Database: NGC 5897". http://gclusters.altervista.org/cluster_4.php?ggc=NGC+5897.
External links
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