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The brighter component is an [[intermediate-mass star|intermediate-mass]] [[B-type main sequence star]] with a [[stellar classification]] of B8&nbsp;Vn.<ref name=houk1979/> The 'n' suffix indicates the [[absorption line]]s are spread out broadly because the star is spinning rapidly. It has a [[projected rotational velocity]] of 255&nbsp;km/s, resulting in an [[equatorial bulge]] with a radius 13% larger than the polar radius.<ref name=aar20_1_51/> The star has 3.44 times the [[solar mass|mass]]<ref name=Perez-Couto2024/> and 3.1 times the [[radius of the Sun]].<ref name=aj129_3_1642/> It is radiating 214 times the [[luminosity of the Sun]] from its [[photosphere]]<ref name=Anderson2012/> at an [[effective temperature]] of 12,549&nbsp;K.<ref name=Perez-Couto2024/>  
The brighter component is an [[intermediate-mass star|intermediate-mass]] [[B-type main sequence star]] with a [[stellar classification]] of B8&nbsp;Vn.<ref name=houk1979/> The 'n' suffix indicates the [[absorption line]]s are spread out broadly because the star is spinning rapidly. It has a [[projected rotational velocity]] of 255&nbsp;km/s, resulting in an [[equatorial bulge]] with a radius 13% larger than the polar radius.<ref name=aar20_1_51/> The star has 3.44 times the [[solar mass|mass]]<ref name=Perez-Couto2024/> and 3.1 times the [[radius of the Sun]].<ref name=aj129_3_1642/> It is radiating 214 times the [[luminosity of the Sun]] from its [[photosphere]]<ref name=Anderson2012/> at an [[effective temperature]] of 12,549&nbsp;K.<ref name=Perez-Couto2024/>  


The secondary is 1.27 times fainter than the primary at [[Photometric system|G-band]], it has 2.03 times the [[mass of the Sun]] and an [[effective temperature]] of 9,161&nbsp;K.<ref name=Perez-Couto2024/>
The secondary is 1.27 times fainter than the primary at Gaia's [[Photometric system#Filters used|G-band]], it has 2.03 times the [[mass of the Sun]] and an [[effective temperature]] of 9,161&nbsp;K.<ref name=Perez-Couto2024/>


There is a magnitude 9.5 companion [[G-type main sequence star]] that may (17% chance) form a gravitationally bpund system with Delta Arae.<ref name=apjss192_1_2/> A 12th magnitude [[double star|optical companion]] is located 47.4 [[arcsecond]]s away along a [[position angle]] of 313°.<ref name=aaa523_A73/>
There is a magnitude 9.5 companion [[G-type main sequence star]] that may (17% chance) form a gravitationally bpund system with Delta Arae.<ref name=apjss192_1_2/> A 12th magnitude [[double star|optical companion]] is located 47.4 [[arcsecond]]s away along a [[position angle]] of 313°.<ref name=aaa523_A73/>
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<ref name=aass34_1>{{citation | last1=Nicolet | first1=B. | year=1978 | title=Photoelectric photometric Catalogue of homogeneous measurements in the UBV System | journal=Astronomy and Astrophysics Supplement Series | volume=34 | pages=1–49 | bibcode=1978A&AS...34....1N | postscript=. }}</ref>
<ref name=aass34_1>{{citation | last1=Nicolet | first1=B. | year=1978 | title=Photoelectric photometric Catalogue of homogeneous measurements in the UBV System | journal=Astronomy and Astrophysics Supplement Series | volume=34 | pages=1–49 | bibcode=1978A&AS...34....1N | postscript=. }}</ref>


<ref name=Perez-Couto2024>{{Citation |last=Pérez-Couto |first=X. |last2=Docobo |first2=J. Á. |last3=Campo |first3=P. P. |date=2024-01-29 |title=Methodology for obtaining the relative orbit and individual masses of <i>Gaia</i> astrometric binaries  |journal=Astronomy &amp; Astrophysics |language=en |volume=682 |pages=A12 |doi=10.1051/0004-6361/202348125 |bibcode=2024A&A...682A..12P |issn=0004-6361 |postscript=.|doi-access=free }}</ref>
<ref name=Perez-Couto2024>{{Citation |last1=Pérez-Couto |first1=X. |last2=Docobo |first2=J. Á. |last3=Campo |first3=P. P. |date=2024-01-29 |title=Methodology for obtaining the relative orbit and individual masses of <i>Gaia</i> astrometric binaries  |journal=Astronomy & Astrophysics |language=en |volume=682 |pages=A12 |doi=10.1051/0004-6361/202348125 |bibcode=2024A&A...682A..12P |issn=0004-6361 |postscript=.|doi-access=free |arxiv=2306.16867 }}</ref>


<ref name=apjss192_1_2>{{citation | last1=Shaya | first1=Ed J. | last2=Olling | first2=Rob P. | title=Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue | journal=The Astrophysical Journal Supplement | volume=192 | issue=1 | page=2 |date=January 2011 | doi=10.1088/0067-0049/192/1/2 | bibcode=2011ApJS..192....2S |arxiv = 1007.0425 | s2cid=119226823 | postscript=. }}</ref>
<ref name=apjss192_1_2>{{citation | last1=Shaya | first1=Ed J. | last2=Olling | first2=Rob P. | title=Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue | journal=The Astrophysical Journal Supplement | volume=192 | issue=1 | page=2 |date=January 2011 | doi=10.1088/0067-0049/192/1/2 | bibcode=2011ApJS..192....2S |arxiv = 1007.0425 | s2cid=119226823 | postscript=. }}</ref>

Latest revision as of 15:30, 25 June 2025

Template:Short description

Delta Arae
Template:Location mark
δ Arae (circled) in the Ara Constellation
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.62[2]
Characteristics
Spectral type B8 Vn[3] + G8 V[4]
U−B Template:Engvar −0.31[2]
B−V Template:Engvar −0.10[2]
Astrometry
Radial velocity (Rv)+10[5] km/s
Proper motion (μ) RA: −54.01[1] mas/yr[1]
Dec.: −99.25 mas/yr[1]
Parallax (π)16.48±0.34 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.31[6]
Orbit[7]
PrimaryA
CompanionB
Period (P)Template:Val yr
Semi-major axis (a)Template:Val
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Argument of periastron (ω)
(secondary)		Template:Val°
Details
δ Ara A
Mass3.44±0.01[7] Template:Solar mass
Radius3.12±0.15[8] Template:Solar radius
Luminosity214[6] Template:Solar luminosity
Surface gravity (log g)3.81±0.06[8] cgs
Temperature12,549[7] K
Rotational velocity (v sin i)255[9] km/s
Age125[10] Myr
δ Ara B
Mass2.03±0.01[7] Template:Solar mass
Temperature9,161[7] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Delta Arae is a binary star[7] in the southern constellation Ara. Its name is a Bayer designation that is Latinized from δ Arae, and abbreviated Delta Ara or δ Ara. This system has an apparent visual magnitude of 3.62[2] and is visible to the naked eye as a point of light. Based upon an annual parallax of Template:Val, it is about Template:Convert distant from the Earth.[1]

Characteristics

This is an astrometric binary system, identified using data from the Gaia spacecraft. The components have an orbital period of about 2.47 years and a high orbital eccentricity of 0.7380. The orbit is nearly edge-on relative to Earth.[7]

The brighter component is an intermediate-mass B-type main sequence star with a stellar classification of B8 Vn.[3] The 'n' suffix indicates the absorption lines are spread out broadly because the star is spinning rapidly. It has a projected rotational velocity of 255 km/s, resulting in an equatorial bulge with a radius 13% larger than the polar radius.[9] The star has 3.44 times the mass[7] and 3.1 times the radius of the Sun.[8] It is radiating 214 times the luminosity of the Sun from its photosphere[6] at an effective temperature of 12,549 K.[7]

The secondary is 1.27 times fainter than the primary at Gaia's G-band, it has 2.03 times the mass of the Sun and an effective temperature of 9,161 K.[7]

There is a magnitude 9.5 companion G-type main sequence star that may (17% chance) form a gravitationally bpund system with Delta Arae.[4] A 12th magnitude optical companion is located 47.4 arcseconds away along a position angle of 313°.[10]

Etymology

Delta Arae was known as Script error: No such module "Lang". (meaning: "the 3rd (star) of Script error: No such module "Lang".") in traditional Chinese astronomy.[12][13]

Allen erroneously called both Delta and Zeta Arae "Tseen Yin" (Script error: No such module "Lang".).[14] He probably confused the constellation "Ara" with "Ari", as 天陰 is actually in Aries.[12][13]

See also

References

Template:Reflist

Further reading

  • Script error: No such module "Lang". (1987): Script error: No such module "Lang"., pp. 312, 328.Template:In lang

External links

Template:Stars of Ara

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aass34_1
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named houk1979
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apjss192_1_2
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named rgcrv
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  7. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named Perez-Couto2024
  8. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aj129_3_1642
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aar20_1_51
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa523_A73
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ a b Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", Annales de l'Observatoire Astronomique de Zô-Sé.
  13. ↑ a b Script error: No such module "Lang". (Yi Shi Tong) (1981): Script error: No such module "Lang"..Template:In lang
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named allen
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