Open star cluster in the constellation Ara
IC 4651 is anopen cluster ofstars located about 2,900light years distant in theconstellation Ara . It was first catalogued byJohn Louis Emil Dreyer in his 1895 version of theIndex Catalogue [ 4] 1.2 ± 0.2 billion years old.[ 5] abundance of the chemical elements other thanhydrogen andhelium .[ 6] mass of the Sun .[ 7]
The currently known active stars in this cluster form only about 7% of the cluster's original mass. Of the remainder, about 35% of the mass consists of stars that have evolved intowhite dwarfs or otherstellar remnants . The remainder of lost mass consists of stars that have migrated away from the main body of the cluster or have been lost completely.[ 7]
The star IC 4651 9122 displaysradial velocity variations suggesting the presence of a planetary companion, though stellar activity cannot be completely ruled out.[ 8] [ 9] [ 10]
^ "Sibling Stars" . Retrieved19 August 2015 .^a b Xin, Y.; Deng, L. (February 2005). "Blue Stragglers in Galactic Open Clusters and Integrated Spectral Energy Distributions".The Astrophysical Journal .619 (2):824– 838.arXiv :astro-ph/0410325 Bibcode :2005ApJ...619..824X .doi :10.1086/426681 .S2CID 2087723 . ^ Dias, W.S.; Alessi, B.S.; Moitinho, A.; Lepine. J.R.D. (July 2002). "New catalog of optically visible open clusters and candidates".Astronomy and Astrophysics .389 (3):871– 873.arXiv :astro-ph/0203351 Bibcode :2002A&A...389..871D .doi :10.1051/0004-6361:20020668 .S2CID 18502004 . VizieR catalogueB/ocl .^ Dreyer, J. L. E. (1895). "Index Catalogue of Nebulae found in the years 1888 to 1894, with Notes and Corrections to the New General Catalogue".Memoirs of the Royal Astronomical Society .51 :185– 228.Bibcode :1895MmRAS..51..185D . ^ Biazzo, K.; et al. (December 2007). "Deriving temperature, mass, and age of evolved stars from high-resolution spectra. Application to field stars and the open cluster IC 4651".Astronomy and Astrophysics .475 (3):981– 989.arXiv :0704.3192 Bibcode :2007A&A...475..981B .doi :10.1051/0004-6361:20077374 .S2CID 14293731 . ^ Pasquini, L.; et al. (September 2004). "Detailed chemical composition of the open cluster IC 4651: The iron peak, α elements, and Li".Astronomy and Astrophysics .424 :951– 963.arXiv :astro-ph/0406113 Bibcode :2004A&A...424..951P .doi :10.1051/0004-6361:20040240 .S2CID 605163 . metallicity value of[ F e H ] = + 0.10 ± 0.03 {\displaystyle {\begin{smallmatrix}\left[{\frac {Fe}{H}}\right]\ =\ +0.10\ \pm \ 0.03\end{smallmatrix}}} ^a b Meibom, S.; Andersen, J.; Nordström, B. (April 2002)."Critical tests of stellar evolution in open clusters. III. Stellar population and dynamical evolution of IC 4651" .Astronomy and Astrophysics .386 :187– 203.Bibcode :2002A&A...386..187M .doi :10.1051/0004-6361:20020183 ^ Leão, I. C.; Canto Martins, B. L.; et al. (December 2018). "Incidence of planet candidates in open clusters and a planet confirmation".Astronomy & Astrophysics 620 : A139.arXiv :1807.03196 Bibcode :2018A&A...620A.139L .doi :10.1051/0004-6361/201833123 . ^ Delgado Mena, E.; Lovis, C.; et al. (November 2018). "Planets around evolved intermediate-mass stars. II. Are there really planets around IC 4651 No. 9122, NGC 2423 No. 3, and NGC 4349 No. 127?".Astronomy & Astrophysics 619 : A2.arXiv :1807.09608 Bibcode :2018A&A...619A...2D .doi :10.1051/0004-6361/201833152 .S2CID 119483881 . ^ Delgado Mena, E.; Gomes da Silva, J.; et al. (November 2023). "Planets around evolved intermediate-mass stars. III. Planet candidates and long-term activity signals in six open clusters".Astronomy & Astrophysics 679 : A94.arXiv :2309.13589 Bibcode :2023A&A...679A..94D .doi :10.1051/0004-6361/202346890 . IC 4651 at Wikimedia Commons
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