IC 4651

{{Infobox open cluster|

| image = File:The rich star cluster IC 4651.jpg

|caption = Open cluster IC 4651 taken by the Wide Field Imager (WFI) camera, on the MPG/ESO 2.2-meter telescope at ESO’s La Silla Observatory in Chile.{{cite web|title=Sibling Stars|url=http://www.eso.org/public/news/eso1534/|access-date=19 August 2015}}

| name = IC 4651

| type = Open Cluster

| epoch = J2000

| ra = {{RA|17|24|49}}

| dec = {{DEC|−49|56|00}}

| dist_ly = 2,900 ly

| dist_pc = 888 pc

| appmag_v =

| size_v = 10.0' (arcmin)

| radius_ly =

| absmag_v =

| constellation = Ara

| notes =

| names = Cr 327, Mel 169

}}

IC 4651 is an open cluster of stars located about 2,900 light years distant in the constellation Ara. It was first catalogued by John Louis Emil Dreyer in his 1895 version of the Index Catalogue. This is an intermediate age cluster that is {{nowrap|1.2 ± 0.2}} billion years old. Compared to the Sun, the members of this cluster have a higher abundance of the chemical elements other than hydrogen and helium. The combined mass of the active stars in this cluster is about 630 times the mass of the Sun.

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 into white dwarfs or other stellar 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.

The star IC 4651 9122 displays radial velocity variations suggesting the presence of a planetary companion, though stellar activity cannot be completely ruled out.

References

{{reflist|refs=

{{cite journal |author1=Dias, W.S. |author2=Alessi, B.S. |author3=Moitinho, A. |author4=Lepine. J.R.D. | title=New catalog of optically visible open clusters and candidates | journal=Astronomy and Astrophysics | volume=389 | pages=871–873 |date=July 2002 |issue=3 | doi=10.1051/0004-6361:20020668 | bibcode=2002A&A...389..871D |arxiv = astro-ph/0203351 |s2cid=18502004 }} Note: see the VizieR catalogue [http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/ocl B/ocl].

{{cite journal | last=Dreyer | first=J. L. E. | title=Index Catalogue of Nebulae found in the years 1888 to 1894, with Notes and Corrections to the New General Catalogue | journal=Memoirs of the Royal Astronomical Society | volume=51 | pages=185–228 | year=1895 | bibcode=1895MmRAS..51..185D }}

{{cite journal |author1=Xin, Y. |author2=Deng, L. | title=Blue Stragglers in Galactic Open Clusters and Integrated Spectral Energy Distributions | journal=The Astrophysical Journal | volume=619| issue=2 | pages=824–838 |date=February 2005

| doi=10.1086/426681 | bibcode=2005ApJ...619..824X |arxiv = astro-ph/0410325 |s2cid=2087723 }}

{{cite journal

| display-authors=1 | last1=Biazzo | first1=K.

| last2=Pasquini | first2=L. | last3=Girardi | first3=L.

| last4=Frasca | first4=A. | last5=da Silva | first5=L.

| last6=Setiawan | first6=J. | last7=Marilli | first7=E.

| last8=Hatzes | first8=A. P. | last9=Catalano | first9=S.

| title=Deriving temperature, mass, and age of evolved stars from high-resolution spectra. Application to field stars and the open cluster IC 4651

| journal=Astronomy and Astrophysics | arxiv=0704.3192

| volume=475 | issue=3 | date=December 2007 | pages=981–989

| doi=10.1051/0004-6361:20077374 | bibcode=2007A&A...475..981B | s2cid=14293731 }}

{{cite journal | author=Pasquini, L. |display-authors=etal | title=Detailed chemical composition of the open cluster IC 4651: The iron peak, α elements, and Li | journal=Astronomy and Astrophysics | volume=424 | pages=951–963 |date=September 2004 | doi=10.1051/0004-6361:20040240 | bibcode=2004A&A...424..951P |arxiv = astro-ph/0406113 |s2cid=605163 }} This source gives a metallicity value of $\begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ +0.10\ \pm\ 0.03\end{smallmatrix}$ , which is equivalent to 125% of the Sun's abundance of Iron.

{{cite journal |author1=Meibom, S. |author2=Andersen, J. |author3=Nordström, B. | title=Critical tests of stellar evolution in open clusters. III. Stellar population and dynamical evolution of IC 4651 | journal=Astronomy and Astrophysics | volume=386 | pages=187–203 |date=April 2002 | doi=10.1051/0004-6361:20020183 | bibcode=2002A&A...386..187M |url=http://lup.lub.lu.se/record/118548 | doi-access=free }}

{{cite journal |last1=Leão |first1=I. C. |last2=Canto Martins |first2=B. L. |display-authors=etal |date=December 2018 |title=Incidence of planet candidates in open clusters and a planet confirmation |journal=Astronomy & Astrophysics |volume=620 |issue= |pages=A139 |doi=10.1051/0004-6361/201833123 |arxiv=1807.03196 |bibcode=2018A&A...620A.139L}}

{{cite journal |last1=Delgado Mena |first1=E. |last2=Lovis |first2=C. |display-authors=etal |date=November 2018 |title=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? |journal=Astronomy & Astrophysics |volume=619 |issue= |pages=A2 |doi=10.1051/0004-6361/201833152 |arxiv=1807.09608 |bibcode=2018A&A...619A...2D |s2cid=119483881}}

{{cite journal |last1=Delgado Mena |first1=E. |last2=Gomes da Silva |first2=J. |display-authors=etal |date=November 2023 |title=Planets around evolved intermediate-mass stars. III. Planet candidates and long-term activity signals in six open clusters |journal=Astronomy & Astrophysics |volume=679 |issue= |pages=A94 |doi=10.1051/0004-6361/202346890 |arxiv=2309.13589 |bibcode=2023A&A...679A..94D}}

}}

External links

{{commonscat-inline}}

Category:Open clusters

4651

Category:Ara (constellation)