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Delta Andromedae

January 10, 2023

Delta Andromedae, Latinized from δ Andromedae, is a triple star[12] system in the northern constellation of Andromeda. 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 105.5 light-years (32.3 parsecs) from the Sun.[1] The system is drifting closer with a radial velocity of −10 km/s.[6]

δ Andromedae
Location of δ Andromedae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Andromeda
Right ascension 00h 39m 19.67518s[1]
Declination +30° 51′ 39.6783″[1]
Apparent magnitude (V) 3.28[2]
Characteristics
Spectral type K3 III[3] + K4 ± 2[4]
U−B color index +1.48[2]
B−V color index +1.28[2]
R−I color index +0.66[5]
Astrometry
Radial velocity (Rv)−9.88±0.15[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]
Distance105.5 ± 0.5 ly
(32.4 ± 0.2 pc)
Absolute magnitude (MV)+0.8[7]
Orbit[8]
Period (P)15,000 d
Eccentricity (e)0.34±0.14
Periastron epoch (T)2415568 JD
Argument of periastron (ω)
(primary)		356.1±5.2°
Semi-amplitude (K1)
(primary)		4.0±2.7 km/s
Details[4]
δ And Aa
Mass~1.3[9] M☉
Radius13.6±0.3 R☉
Luminosity68±4 L☉
Surface gravity (log g)2.0±0.3[3] cgs
Temperature4,315±9 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 M☉
Other designations
δ And, Delta Andromedae, Delta And, 31 Andromedae, 31 And, NSV 15142, BD+30 91, FK5 20, HD 3627, HIP 3092, HR 165, SAO 54058, WDS 00393+3052A[10][11]
Database references
SIMBADdata

In Chinese, 奎宿 (Kuí Sù), 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 奎宿五 (Kuí Sù wǔ, English: the Fifth Star of Legs.)[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 11.55±0.13 AU.[4] 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 astronomical units.[16]

An excess of infrared emission from δ Andromedae suggested that it may be surrounded by a shell of dust.[3][17] In 2003 it was determined that this is more likely a circumstellar debris disk.[15]

References

  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  3. ^ a b c d Judge, P. G.; Jordan, C.; Rowan-Robinson, M. (January 1, 1987), "Delta Andromedae (K3 III) - an IRAS source with an unusual ultraviolet spectrum", Monthly Notices of the Royal Astronomical Society, 224: 93–106, Bibcode:1987MNRAS.224...93J, doi:10.1093/mnras/224.1.93.
  4. ^ a b c Bottom, M.; et al. (August 4, 2015), "Resolving the Delta Andromedae Spectroscopic Binary with Direct Imaging", The Astrophysical Journal, 809 (1): 11, arXiv:1506.07517, Bibcode:2015ApJ...809...11B, doi:10.1088/0004-637X/809/1/11, S2CID 32786144.
  5. ^ Hoffleit, D.; Warren Jr., W. H., "HR 165, database entry", The Bright Star Catalogue (5th (Preliminary Version) ed.), CDS ID V/50. Accessed on line August 28, 2008.
  6. ^ a b c Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  7. ^ Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific, 121 (882): 842, arXiv:0907.3346, Bibcode:2009PASP..121..842R, doi:10.1086/605456, S2CID 17821279.
  8. ^ a b Bakos, Gustav A. (February 1976), "The spectroscopic orbit of δ Andromedae", Journal of the Royal Astronomical Society of Canada, 70: 23–26, Bibcode:1976JRASC..70...23B.
  9. ^ Gontcharov, G.A.; Kiyaeva, O. V. (2002), "Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos I. Comparison with known orbits", Astronomy and Astrophysics, 391, 647–657: 647, Bibcode:2002A&A...391..647G, doi:10.1051/0004-6361:20020896.
  10. ^ "del And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 28, 2008.
  11. ^ , The Washington Double Star Catalog, United States Naval Observatory, archived from the original on 2008-04-12, retrieved 2008-08-28
  12. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  13. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
  14. ^ Richard Hinckley Allen (1899) Star-names and Their Meanings, p. 38.
  15. ^ a b Decin, G.; et al. (November 2003), "Age Dependence of the Vega Phenomenon: Observations", The Astrophysical Journal, 598 (1): 636–644, arXiv:astro-ph/0308294, Bibcode:2003ApJ...598..636D, doi:10.1086/378800, S2CID 16751327
  16. ^ Kaler, James B., "DELTA AND (Delta Andromedae)", Stars, University of Illinois, retrieved 2012-01-23
  17. ^ Wirsich, J. (August 1998), "The Chromospheric Radiation on the Circumstellar Shell of δ Andromedae", The Astrophysical Journal, 502 (2): 909–917, Bibcode:1998ApJ...502..909W, doi:10.1086/305935.

External links

January 10, 2023
delta, andromedae, latinized, from, andromedae, triple, star, system, northern, constellation, andromeda, system, visible, naked, point, light, with, combined, apparent, visual, magnitude, based, upon, parallax, measurements, located, distance, approximately, . Delta Andromedae Latinized from d Andromedae is a triple star 12 system in the northern constellation of Andromeda 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 105 5 light years 32 3 parsecs from the Sun 1 The system is drifting closer with a radial velocity of 10 km s 6 d AndromedaeLocation of d Andromedae circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation AndromedaRight ascension 00h 39m 19 67518s 1 Declination 30 51 39 6783 1 Apparent magnitude V 3 28 2 CharacteristicsSpectral type K3 III 3 K4 2 4 U B color index 1 48 2 B V color index 1 28 2 R I color index 0 66 5 AstrometryRadial velocity Rv 9 88 0 15 6 km sProper motion m RA 114 45 1 mas yr Dec 84 02 1 mas yrParallax p 30 91 0 15 mas 1 Distance105 5 0 5 ly 32 4 0 2 pc Absolute magnitude MV 0 8 7 Orbit 8 Period P 15 000 dEccentricity e 0 34 0 14Periastron epoch T 2415568 JDArgument of periastron w primary 356 1 5 2 Semi amplitude K1 primary 4 0 2 7 km sDetails 4 d And AaMass 1 3 9 M Radius13 6 0 3 R Luminosity68 4 L Surface gravity log g 2 0 0 3 3 cgsTemperature4 315 9 KMetallicity Fe H 0 04 dexRotational velocity v sin i 6 5 6 km sAge3 2 Gyrd And AbMass0 6 0 8 M Other designationsd And Delta Andromedae Delta And 31 Andromedae 31 And NSV 15142 BD 30 91 FK5 20 HD 3627 HIP 3092 HR 165 SAO 54058 WDS 00393 3052A 10 11 Database referencesSIMBADdataIn Chinese 奎宿 Kui Su meaning Legs asterism refers to an asterism consisting of d Andromedae h Andromedae 65 Piscium z Andromedae i Piscium e Andromedae p Andromedae n Andromedae m Andromedae b Andromedae s Piscium t Piscium 91 Piscium y Piscium f Piscium x Piscium and ps1 Piscium Consequently the Chinese name for d Andromedae itself is 奎宿五 Kui Su wǔ English the Fifth Star of Legs 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 11 55 0 13 AU 4 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 astronomical units 16 An excess of infrared emission from d Andromedae suggested that it may be surrounded by a shell of dust 3 17 In 2003 it was determined that this is more likely a circumstellar debris disk 15 References Edit a b c d e f van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Johnson H L et al 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 99 Bibcode 1966CoLPL 4 99J a b c d Judge P G Jordan C Rowan Robinson M January 1 1987 Delta Andromedae K3 III an IRAS source with an unusual ultraviolet spectrum Monthly Notices of the Royal Astronomical Society 224 93 106 Bibcode 1987MNRAS 224 93J doi 10 1093 mnras 224 1 93 a b c Bottom M et al August 4 2015 Resolving the Delta Andromedae Spectroscopic Binary with Direct Imaging The Astrophysical Journal 809 1 11 arXiv 1506 07517 Bibcode 2015ApJ 809 11B doi 10 1088 0004 637X 809 1 11 S2CID 32786144 Hoffleit D Warren Jr W H HR 165 database entry The Bright Star Catalogue 5th Preliminary Version ed CDS ID V 50 Accessed on line August 28 2008 a b c Massarotti Alessandro et al January 2008 Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity The Astronomical Journal 135 1 209 231 Bibcode 2008AJ 135 209M doi 10 1088 0004 6256 135 1 209 Ryon Jenna et al August 2009 Comparing the Ca ii H and K Emission Lines in Red Giant Stars Publications of the Astronomical Society of the Pacific 121 882 842 arXiv 0907 3346 Bibcode 2009PASP 121 842R doi 10 1086 605456 S2CID 17821279 a b Bakos Gustav A February 1976 The spectroscopic orbit of d Andromedae Journal of the Royal Astronomical Society of Canada 70 23 26 Bibcode 1976JRASC 70 23B Gontcharov G A Kiyaeva O V 2002 Photocentric orbits from a direct combination of ground based astrometry with Hipparcos I Comparison with known orbits Astronomy and Astrophysics 391 647 657 647 Bibcode 2002A amp A 391 647G doi 10 1051 0004 6361 20020896 del And SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved August 28 2008 Entry 00393 3052 The Washington Double Star Catalog United States Naval Observatory archived from the original on 2008 04 12 retrieved 2008 08 28 Eggleton P P Tokovinin A A September 2008 A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 879 arXiv 0806 2878 Bibcode 2008MNRAS 389 869E doi 10 1111 j 1365 2966 2008 13596 x S2CID 14878976 in Chinese AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 5 月 19 日 Richard Hinckley Allen 1899 Star names and Their Meanings p 38 a b Decin G et al November 2003 Age Dependence of the Vega Phenomenon Observations The Astrophysical Journal 598 1 636 644 arXiv astro ph 0308294 Bibcode 2003ApJ 598 636D doi 10 1086 378800 S2CID 16751327 Kaler James B DELTA AND Delta Andromedae Stars University of Illinois retrieved 2012 01 23 Wirsich J August 1998 The Chromospheric Radiation on the Circumstellar Shell of d Andromedae The Astrophysical Journal 502 2 909 917 Bibcode 1998ApJ 502 909W doi 10 1086 305935 External links EditThe Constellation Andromeda The Chained Maiden web page European Southern Observatory outreach Image Delta Andromedae Retrieved from https en wikipedia org w index php title Delta Andromedae amp oldid 1079510979, wikipedia, wiki, book, books, library,

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