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Epsilon2 Arae

{{Short description|Star in the constellation Ara}}

{{for|other star systems with this Bayer designation|Epsilon Arae}}

{{DISPLAYTITLE:Epsilon2 Arae}}

{{Starbox begin

| name = Epsilon2 Arae

}}

{{Starbox image

| image =

{{Location mark

| image=Ara IAU.svg

| alt= | float=center | width=240 | label=|position=right

| mark=Red circle.svg | mark_width=10 | mark_link=δ Arae

| x%=59.5 | y%=42.5

}}

| caption = The location of ε2 Arae (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|17|03|08.754}}

| dec = {{DEC|−53|14|12.97}}

| appmag_v = 5.270 (5.44 + 8.65)

| constell = Ara

}}

{{Starbox character

| class = {{nowrap|F5 V Fe+0.5}} + DA3.2

| r-i =

| v-r =

| b-v = +0.498{{±|0.005}}

| u-b = +0.015

| variable =

}}

{{Starbox astrometry

| radial_v = +4.9

| prop_mo_ra = −22.409

| prop_mo_dec = −143.793

| pm_footnote =

| parallax = 37.3696

| p_error = 0.1347

| parallax_footnote =

| absmag_v = 3.27

}}

{{Starbox orbit

| reference =

| primary = ε2 Ara Aa

| name = ε2 Ara Ab

| period = 41.3

| axis = 0.589

| eccentricity = 0.622

| inclination = 133.8

| node = 73.6

| periastron =

| periarg =

| periarg_primary =

| k1 =

| k2 =

}}

{{Starbox detail

| component1 = ε2 Ara Aa

| mass = 1.40{{±|0.01|0.02}}

| radius = 1.8

| luminosity = 4.56

| temperature = 6,577

| metal_fe = +0.02

| gravity = 4.29

| rotational_velocity= 45.4

| age_gyr = 1.77{{±|0.29|0.26}}

| component2 = ε2 Ara C

| mass2 = 0.65

| temperature2= 15,570

}}

{{Starbox catalog

| names = {{odlist | CPD=−53°8316 | GJ=3985 | HD=153580 | HIP=83431 | HR=6314 | SAO=244388 | WDS=J17031-5314A | GC=22956 | PPM=345633 }}

}}

{{Starbox reference

| Simbad = eps02+Ara

}}

{{Starbox end}}

Epsilon2 Arae is a double star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from ε2 Arae, and abbreviated Epsilon2 Ara or ε2 Ara. Based on parallax measurements, it is {{Convert|89|ly|pc|abbr=off|lk=on}} distant from Earth. With a combined apparent visual magnitude of 5.27, this system is faintly visible to the naked eye as a point of light.

The brighter star is a magnitude 5.44 F-type main sequence star with a stellar classification of {{nowrap|F5 V Fe+0.5}}. The Fe+0.5 notation indicates that it has a somewhat higher than normal abundance of iron. It has an estimated age of 1.8 billion years and a relatively high rate of rotation with a projected rotational velocity of 45 km/s. This star has 1.4 times the mass of the Sun and 1.8 times the Sun's radius. It is radiating 4.56 times the luminosity of the Sun from its photosphere at an effective temperature of 6,577 K. The metallicity of the star, a measure of the abundance of more massive elements, is similar to the Sun. It is a candidate pulsating star.

There is a magnitude 8.65 stellar companion, component Ab, at an angular separation of 0.590 arcseconds. The pair have an estimated orbital period of 41.3 years. A common proper motion white dwarf companion, WD 1659-53, lies at an angular separation of {{val|113.76|u=arcsecond}}. Designated component C, it is magnitude 13.47 with a classification of DA3.2.

References

{{Reflist|refs=

{{cite Gaia EDR3|5923907314622859520}}

{{citation | last=Balachandran | first=Suchitra | title=Lithium depletion and rotation in main-sequence stars | journal=Astrophysical Journal, Part 1 | volume=354 | date=May 1, 1990 | pages=310–332 | doi=10.1086/168691 | bibcode=1990ApJ...354..310B | postscript=.}}

{{citation | display-authors=1 | last1=Gray | first1=R. O. | first2=C. J. | last2=Corbally | first3=R. F. | last3=Garrison | first4=M. T. | last4=McFadden | first5=P. E. | last5=Robinson | title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I | journal=The Astronomical Journal | volume=132 | issue=1 | pages=161–170 | date=July 2006 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=.}}

{{citation | display-authors=1 | last1=Holmberg | first1=J. | last2=Nordström | first2=B. | last3=Andersen | first3=J. | title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics | journal=Astronomy and Astrophysics Supplement Series | volume=501 | issue=3 | date=July 2009 | pages=941–947 | doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H | postscript=. | arxiv = 0811.3982| s2cid=118577511 }}

{{citation | display-authors=1 | last1=Schröder | first1=C. | last2=Reiners | first2=Ansgar | last3=Schmitt | first3=Jürgen H. M. M. | title=Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo | journal=Astronomy and Astrophysics | volume=493 | issue=3 | pages=1099–1107 | date=January 2009 | doi=10.1051/0004-6361:200810377 | bibcode=2009A&A...493.1099S | postscript=. | doi-access=free | url=http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2 }}{{Dead link|date=September 2023 |bot=InternetArchiveBot |fix-attempted=yes }}

{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | postscript=. | arxiv = 0806.2878| s2cid=14878976 }}

{{cite simbad | title=* eps02 Ara | access-date=2015-03-03}}

{{citation | title=GJ 2125 -- White Dwarf | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=GJ+2125 | access-date=2010-07-28 | postscript=.}}

{{citation | postscript=.

| title=The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite

| last1=Schofield | first1=Mathew | last2=Chaplin | first2=William J.

| last3=Huber | first3=Daniel | last4=Campante | first4=Tiago L.

| last5=Davies | first5=Guy R. | last6=Miglio | first6=Andrea

| last7=Ball | first7=Warrick H. | last8=Appourchaux | first8=Thierry

| last9=Basu | first9=Sarbani | last10=Bedding | first10=Timothy R.

| last11=Christensen-Dalsgaard | first11=Jørgen | last12=Creevey | first12=Orlagh

| last13=García | first13=Rafael A. | last14=Handberg | first14=Rasmus

| last15=Kawaler | first15=Steven D. | last16=Kjeldsen | first16=Hans

| last17=Latham | first17=David W. | last18=Lund | first18=Mikkel N.

| last19=Metcalfe | first19=Travis S. | last20=Ricker | first20=George R.

| last21=Serenelli | first21=Aldo | last22=Silva Aguirre | first22=Victor

| last23=Stello | first23=Dennis | last24=Vanderspek | first24=Roland

| display-authors=1 | journal=The Astrophysical Journal Supplement Series

| date=2019 | volume=241 | issue=1 | page=12

| doi=10.3847/1538-4365/ab04f5 | doi-access=free

| bibcode=2019ApJS..241...12S | arxiv=1901.10148 }}

{{citation | postscript=.

| title=Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert

| display-authors=1 | last1=Aguilera-Gómez | first1=Claudia

| last2=Ramírez | first2=Iván | last3=Chanamé | first3=Julio

| journal=Astronomy & Astrophysics

| date=June 2018 | volume=614 | page=A55

| issn=0004-6361 | eissn=1432-0746

| doi=10.1051/0004-6361/201732209 | doi-access=free

| bibcode=2018A&A...614A..55A | arxiv=1803.05922 }}

{{citation | postscript=.

| title=Where are all the Sirius-like binary systems?

| display-authors=1 | last1=Holberg | first1=J. B.

| last2=Oswalt | first2=T. D. | last3=Sion | first3=E. M.

| last4=Barstow | first4=M. A. | last5=Burleigh | first5=M. R.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=435 | issue=3 | pages=2077–2091 | date=November 2013

| doi=10.1093/mnras/stt1433 | doi-access=free

| bibcode=2013MNRAS.435.2077H | arxiv=1307.8047 }}

{{citation | postscript=.

| title=A spectroscopic search for high azimuthal-order pulsation in broad-lined late F- and early G-stars.

| last1=Baade | first1=D. | last2=Kjeldsen | first2=H.

| journal=Astronomy and Astrophysics

| volume=323 | pages=429–441 | date=July 1997

| bibcode=1997A&A...323..429B }}

{{citation | postscript=.

| title=Orbit Alignment in Triple Stars

| last=Tokovinin | first=Andrei

| journal=The Astrophysical Journal | language=en

| volume=844 |issue=2 |pages=103 | date=July 2017

| doi=10.3847/1538-4357/aa7746 |doi-access=free

| arxiv=1706.00748 | bibcode=2017ApJ...844..103T

| issn=0004-637X }}

}}

External links

  • [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%206314 HR 6314]
  • [http://aladin.u-strasbg.fr/AladinPreview?-c=HD+153580&ident=HD+153580&submit=Aladin+previewer Image Epsilon2 Arae]

{{Stars of Ara}}

{{DEFAULTSORT:Epsilon2 Arae}}

Category:F-type main-sequence stars

Category:White dwarfs

Category:Double stars

Category:Ara (constellation)

Arae, Epsilon2

6314

PD-53 08316

3985

153580

083431