Delta Andromedae: Difference between revisions

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In [[Chinese astronomy|Chinese]], {{lang|zh|奎宿}} ({{lang|zh-Latn|Kuí Sù}}), meaning ''[[Legs (Chinese constellation)|Legs]] (asterism)'', refers to an asterism consisting of δ Andromedae, [[Eta Andromedae|η Andromedae]], [[65 Piscium]], [[Zeta Andromedae|ζ Andromedae]], [[Iota Piscium|ι Piscium]], [[Epsilon Andromedae|ε Andromedae]],  [[Pi Andromedae|π Andromedae]], [[Nu Andromedae|ν Andromedae]], [[Mu Andromedae|μ Andromedae]], [[Beta Andromedae|β Andromedae]], [[Sigma Piscium|σ Piscium]], [[Tau Piscium|τ Piscium]], [[91 Piscium]], [[Upsilon Piscium|υ Piscium]], [[Phi Piscium|φ Piscium]], [[Chi Piscium|χ Piscium]] and [[Psi1 Piscium|ψ<sup>1</sup> Piscium]]. Consequently, the [[Chinese star names|Chinese name]] for δ Andromedae itself is {{lang|zh|奎宿五}} ({{lang|zh-Latn|Kuí Sù wǔ}}, {{langx|en|the Fifth Star of Legs}}.)<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060519.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日] {{Webarchive|url=https://web.archive.org/web/20160303170659/http://aeea.nmns.edu.tw/2006/0605/ap060519.html |date=2016-03-03 }}</ref>  Apart from its [[Bayer designation]], it was also given the title ''Delta'' by [[Elijah Hinsdale Burritt|Elijah H. Burritt]] in his [[star atlas]].<ref name=allen/>
In [[Chinese astronomy|Chinese]], {{lang|zh|奎宿}} ({{lang|zh-Latn|Kuí Sù}}), meaning ''[[Legs (Chinese constellation)|Legs]] (asterism)'', refers to an asterism consisting of δ Andromedae, [[Eta Andromedae|η Andromedae]], [[65 Piscium]], [[Zeta Andromedae|ζ Andromedae]], [[Iota Piscium|ι Piscium]], [[Epsilon Andromedae|ε Andromedae]],  [[Pi Andromedae|π Andromedae]], [[Nu Andromedae|ν Andromedae]], [[Mu Andromedae|μ Andromedae]], [[Beta Andromedae|β Andromedae]], [[Sigma Piscium|σ Piscium]], [[Tau Piscium|τ Piscium]], [[91 Piscium]], [[Upsilon Piscium|υ Piscium]], [[Phi Piscium|φ Piscium]], [[Chi Piscium|χ Piscium]] and [[Psi1 Piscium|ψ<sup>1</sup> Piscium]]. Consequently, the [[Chinese star names|Chinese name]] for δ Andromedae itself is {{lang|zh|奎宿五}} ({{lang|zh-Latn|Kuí Sù wǔ}}, {{langx|en|the Fifth Star of Legs}}.)<ref>{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060519.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日] {{Webarchive|url=https://web.archive.org/web/20160303170659/http://aeea.nmns.edu.tw/2006/0605/ap060519.html |date=2016-03-03 }}</ref>  Apart from its [[Bayer designation]], it was also given the title ''Delta'' by [[Elijah Hinsdale Burritt|Elijah H. Burritt]] in his [[star atlas]].<ref name=allen/>


This is a long-period [[spectroscopic binary]] with an orbital period of approximately 15,000 days (41 years). The primary of the spectroscopic binary, component Aa, has a [[stellar classification]] of K3&nbsp;III, indicating that it is an aging [[giant star]].<ref name=judge /><ref name=specorb /> It most likely evolved from a F-type [[main sequence]] star after consuming the hydrogen at its core.<ref name=apj598_1_636/> The secondary, component Ab, is a relatively faint K-type dwarf, which has been imaged using a stellar [[coronagraph]]. The pair have a physical separation of {{val|11.55|0.13|ul=AU}}.<ref name=bottom/> The system has two companions, the closest of which is most likely an orbiting [[red dwarf]] of class M3 with a separation of at least 900&nbsp;[[astronomical unit]]s.<ref name=kaler/>
This is a long-period [[spectroscopic binary]] with an orbital period of approximately 15,000 days (41 years). The primary of the spectroscopic binary, component Aa, has a [[stellar classification]] of K3&nbsp;III, indicating that it is an aging [[giant star]].<ref name=judge /><ref name=specorb /> It most likely evolved from a F-type [[main sequence]] star after consuming the hydrogen at its core.<ref name=apj598_1_636/> The secondary, component Ab, is a relatively faint K-type dwarf, which has been imaged using a stellar [[coronagraph]]. The pair have a physical separation of {{val|11.55|0.13|ul=AU}}.<ref name=bottom/>  
 
The system has two companions, the closest of which is an orbiting [[red dwarf]] of class M3 with a separation of at least 940&nbsp;[[astronomical unit]]s.<ref name=kaler/><ref name=Kervella2022/>


An [[infrared excess|excess of infrared emission]] from δ Andromedae suggested that it may be surrounded by a shell of dust.<ref name=judge /><ref name=Wirsich1998/> In 2003 it was determined that this is more likely a circumstellar [[debris disk]].<ref name=apj598_1_636/>
An [[infrared excess|excess of infrared emission]] from δ Andromedae suggested that it may be surrounded by a shell of dust.<ref name=judge /><ref name=Wirsich1998/> In 2003 it was determined that this is more likely a circumstellar [[debris disk]].<ref name=apj598_1_636/>
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<ref name=gontcharov>{{citation | title=Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos I. Comparison with known orbits | first1=G.A. | last1=Gontcharov | first2=O. V. | last2=Kiyaeva | journal=[[Astronomy and Astrophysics]] | volume=391, 647-657  | date=2002 | page=647 | bibcode=2002A&A...391..647G |doi = 10.1051/0004-6361:20020896 | doi-access=free }}.</ref>
<ref name=gontcharov>{{citation | title=Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos I. Comparison with known orbits | first1=G.A. | last1=Gontcharov | first2=O. V. | last2=Kiyaeva | journal=[[Astronomy and Astrophysics]] | volume=391, 647-657  | date=2002 | page=647 | bibcode=2002A&A...391..647G |doi = 10.1051/0004-6361:20020896 | doi-access=free }}.</ref>
<ref name=Kervella2022>{{Cite journal |last=Kervella |first=Pierre |last2=Arenou |first2=Frédéric |last3=Thévenin |first3=Frédéric |date=January 2022 |title=Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs |journal=Astronomy and Astrophysics |language=en |volume=657 |pages=A7 |doi=10.1051/0004-6361/202142146 |doi-access=free |bibcode=2022A&A...657A...7K |arxiv=2109.10912 |issn=0004-6361}}</ref>


<ref name=specorb>{{citation | title=The spectroscopic orbit of δ Andromedae | first1=Gustav A. | last1=Bakos | journal=Journal of the Royal Astronomical Society of Canada | volume=70 |date=February 1976 | pages=23–26 | bibcode=1976JRASC..70...23B }}.</ref>
<ref name=specorb>{{citation | title=The spectroscopic orbit of δ Andromedae | first1=Gustav A. | last1=Bakos | journal=Journal of the Royal Astronomical Society of Canada | volume=70 |date=February 1976 | pages=23–26 | bibcode=1976JRASC..70...23B }}.</ref>

Latest revision as of 13:27, 23 June 2025

Template:Short description

δ Andromedae
Template:Location mark
Location of δ Andromedae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Andromeda
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.28[2]
Characteristics
Spectral type K3 III[3] + K4 ± 2[4]
U−B Template:Engvar +1.48[2]
B−V Template:Engvar +1.28[2]
R−I Template:Engvar +0.66[5]
Astrometry
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: +114.45[1] mas/yr
Dec.: −84.02[1] mas/yr
Parallax (π)30.91±0.15 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.8[7]
Orbit[8]
Period (P)15,000 d
Eccentricity (e)Template:Val
Periastron epoch (T)2415568 JD
Argument of periastron (ω)
(primary)		Template:Val°
Semi-amplitude (K1)
(primary)		Template:Val km/s
Details[4]
δ And Aa
Mass~1.3[9] Template:Solar mass
RadiusTemplate:Val Template:Solar radius
LuminosityTemplate:Val Template:Solar luminosity
Surface gravity (log g)Template:Val[3] cgs
TemperatureTemplate:Val K
Metallicity [Fe/H]0.04 dex
Rotational velocity (v sin i)6.5[6] km/s
Age3.2 Gyr
δ And Ab
Mass0.6–0.8 Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10][11]
Database references
SIMBADdata

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

Delta Andromedae is a triple star[12] system in the northern constellation of Andromeda. Its identifier is a Bayer designation that is Latinized from δ Andromedae, and abbreviated Delta And or δ And, respectively. The system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 3.28.[2] Based upon parallax measurements, it is located at a distance of approximately Template:Convert from the Sun.[1] The system is drifting closer with a radial velocity of −10 km/s.[6]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Legs (asterism), refers to an asterism consisting of δ Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ι Piscium, ε Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ1 Piscium. Consequently, the Chinese name for δ Andromedae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[13] Apart from its Bayer designation, it was also given the title Delta by Elijah H. Burritt in his star atlas.[14]

This is a long-period spectroscopic binary with an orbital period of approximately 15,000 days (41 years). The primary of the spectroscopic binary, component Aa, has a stellar classification of K3 III, indicating that it is an aging giant star.[3][8] It most likely evolved from a F-type main sequence star after consuming the hydrogen at its core.[15] The secondary, component Ab, is a relatively faint K-type dwarf, which has been imaged using a stellar coronagraph. The pair have a physical separation of Template:Val.[4]

The system has two companions, the closest of which is an orbiting red dwarf of class M3 with a separation of at least 940 astronomical units.[16][17]

An excess of infrared emission from δ Andromedae suggested that it may be surrounded by a shell of dust.[3][18] In 2003 it was determined that this is more likely a circumstellar debris disk.[15]

References

Template:Reflist

External links

Template:Stars of Andromeda

  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 clpl4_99
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named judge
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named bottom
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named bsc1
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aj135_1_209
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Ryon2009
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named specorb
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gontcharov
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named sb0
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named wds
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton_Tokovinin_2008
  13. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日 Template:Webarchive
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named allen
  15. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj598_1_636
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named kaler
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kervella2022
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Wirsich1998
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