20 Arietis

{{Starbox observe

| epoch = J2000

| constell = Aries

| ra = {{RA|02|15|46.04981}}

| dec = {{DEC|+25|46|58.5741}}

| appmag_v = 5.79

}}

{{Starbox character

| class = F6 III-IV or F6 IV-V

| b-v = {{Val|0.439|0.005}}

}}

{{Starbox astrometry

| radial_v = {{Val|+25.1|0.3}}

| prop_mo_ra = +177.067

| prop_mo_dec = −64.694

| parallax = 24.1949

| p_error = 0.1121

| parallax_footnote =

| absmag_v = 2.67

}}

{{Starbox detail

| mass = {{Val|1.49|0.10}}

| radius = {{Val|1.94|0.24}}

| luminosity = {{Val|6.6|0.3}}

| temperature = {{Val|6416|60|fmt=commas}}

| metal_fe = {{Val|0.27|0.05}}

| rotational_velocity = 8.0

| gravity = {{Val|4.03|0.05}}

| age_gyr = {{Val|2.19|0.44|0.37}}

}}

{{Starbox catalog

| names = {{odlist | F=20 Ari | BD=+25°373 | HD=13871 | HIP=10540 | HR=656 | SAO=75239 | GC=2707 }}

}}

{{Starbox reference

| Simbad = 20+Ari

}}

20 Arietis is a single star in the northern constellation of Aries. 20 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 5.79, which is bright enough to be just faintly visible to the naked eye as a yellow-white hued star. The star is located approximately 137 light years away from the Sun based upon parallax. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.188 arc seconds per annum. 20 Arietis is receding from the Earth with a heliocentric radial velocity of +25 km/s.

Gray et al. (2001) gave the stellar classification of 20 Arietis as F6 III-IV, matching an F-type star with spectral traits intermediate between a giant and a subgiant star. Harlan (1969) had found a less-evolved class of F6 IV-V. The star is around two billion years old with an estimated 1.5 times the mass of the Sun and two times the Sun's radius. It is spinning with a projected rotational velocity of 8.0 km/s and has a higher than solar metallicity. The star is radiating 6.6 times the luminosity of the Sun from its photosphere at an effective temperature of around 6,416 K.

References

{{reflist|refs=

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters | postscript=.

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{citation

| title=Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library

| display-authors=1 | last1=Yee | first1=Samuel W.

| last2=Petigura | first2=Erik A. | last3=von Braun | first3=Kaspar

| journal=The Astrophysical Journal | postscript=.

| volume=836 | issue=1 | id=77 | pages=17

| date=February 2017 | doi=10.3847/1538-4357/836/1/77

| arxiv=1701.00922 | bibcode=2017ApJ...836...77Y | s2cid=6302522 | doi-access=free }}

{{citation

| display-authors=1 | last1=Gray | first1=R. O.

| last2=Napier | first2=M. G. | last3=Winkler | first3=L. I.

|title=The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars

| journal=The Astronomical Journal

| volume=121 | issue=4 | pages=2148 | year=2001

| doi=10.1086/319956 | bibcode=2001AJ....121.2148G | postscript=. | doi-access=free }}

{{citation

| title=A catalogue of multiplicity among bright stellar systems

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869 | date=2008

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878

| bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}

{{citation

| last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M.

| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)

| journal=The Astronomical Journal

| volume=129 | issue=3 | pages=1483–1522 | date=March 2005

| doi=10.1086/427854 | bibcode=2005AJ....129.1483L

| arxiv=astro-ph/0412070 | s2cid=2603568 | postscript=. }}

{{citation

| last1=Harlan | first1=E. A.

| title=MK classifications for F- and G-type stars. I

| journal=Astronomical Journal | postscript=.

| volume=74 | pages=916–919 |date=September 1969

| doi=10.1086/110881 | bibcode=1969AJ.....74..916H }}

{{citation|bibcode=2016ApJS..225...32B|title=Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars|journal=The Astrophysical Journal Supplement Series|volume=225|issue=2|pages=32|last1=Brewer|first1=John M.|last2=Fischer|first2=Debra A.|last3=Valenti|first3=Jeff A.|last4=Piskunov|first4=Nikolai|year=2016|arxiv=1606.07929|doi=10.3847/0067-0049/225/2/32|s2cid=118507965|postscript=. |doi-access=free }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%20656 HR 656]
[http://aladin.u-strasbg.fr/AladinPreview?-c=02+15+46.0501%2B25+46+58.575&ident=*++20+Ari&submit=Aladin+previewer Image 20 Arietis]

Category:F-type main-sequence stars

Category:F-type subgiants

Category:F-type giants

Category:Aries (constellation)

Category:Durchmusterung objects