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Epsilon Delphini

January 01, 1970

Epsilon Delphini (ε Delphini, abbreviated Eps Del, ε Del), officially named Aldulfin /ælˈdʌlfən/,[12] is a solitary,[13] blue-white hued star in the northern constellation of Delphinus. It is visible to the naked eye with an apparent visual magnitude of 4.03.[2] Based upon an annual parallax shift of 9.87 mas as seen from the Earth,[1] the system is located about 330 light-years from the Sun. At Epsilon Delphini's distance, the visual magnitude is diminished by an extinction factor of 0.11 due to interstellar dust.[6] The star is moving closer to the Sun with a radial velocity of −19 km/s.[5]

ε Delphini
Location of ε Delphini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 33m 12.77192s[1]
Declination +11° 18′ 11.7412″[1]
Apparent magnitude (V) 4.03[2] (3.95−4.05)[3]
Characteristics
Spectral type B6 III[4]
U−B color index −0.46[2]
B−V color index −0.13[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)−19.4±0.7[5] km/s
Proper motion (μ) RA: +11.96[1] mas/yr
Dec.: −28.97[1] mas/yr
Parallax (π)9.87 ± 0.21 mas[1]
Distance330 ± 7 ly
(101 ± 2 pc)
Absolute magnitude (MV)−0.06[6]
Details
Radius4.6[7] R☉
Luminosity676[8] L☉
Surface gravity (log g)3.71±0.09[9] cgs
Temperature13,614±15[7] K
Metallicity [Fe/H]+0.08±0.10[9] dex
Rotational velocity (v sin i)52±4[10] km/s
Age220[6] Myr
Other designations
Aldulfin, ε Del, 2 Del, BD+10° 4321, FK5 768, HD 195810, HIP 101421, HR 7852, SAO 106230[11]
Database references
SIMBADdata

This is a B-type giant star with a stellar classification of B6 III.[4] It has 4.6[7] times the Sun's radius and is radiating 676[8] times the solar luminosity from its photosphere at an effective temperature of 13,614 K.[7] The star may be slightly variable, occasionally brightening to magnitude 3.95.[3] It is spinning with a projected rotational velocity of 52 km/s.[10]

Proper names edit

ε Delphini (Latinised to Epsilon Delphini) is the star's Bayer designation.

The star bore the traditional Arabic name ðanab ad-dulfīn or Dzaneb al Delphin, which appeared in the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket and which was translated into Latin as Cauda Delphini, meaning 'the dolphin's tail'.[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Aldulfin for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[12]

In Chinese, 敗瓜 (Bài Guā), meaning Rotten Gourd, refers to an asterism consisting of Epsilon Delphini, Eta Delphini, Theta Delphini, Iota Delphini and Kappa Delphini.[16] Consequently, the Chinese name for Epsilon Delphini itself is 敗瓜一 (Bài Guā yī, English: the First Star of Rotten Gourd.).[17] From this Chinese name, the name Pae Chaou was formed.[18]

References edit

  1. ^ a b c d e f van Leeuwen, F. (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 Crawford, D. L.; et al. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
  3. ^ a b c Samus, N. N.; et al. (January 2017), "General Catalogue of Variable Stars", Astronomy Reports, GCVS 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  4. ^ a b Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179.
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  6. ^ a b c Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  7. ^ a b c d Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601.
  8. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  9. ^ a b Wu, Yue; et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics, 525: A71, arXiv:1009.1491, Bibcode:2011A&A...525A..71W, doi:10.1051/0004-6361/201015014, S2CID 53480665.
  10. ^ a b Bailey, J. D.; Landstreet, J. D. (2013), "Abundances determined using Si ii and Si iii in B-type stars: Evidence for stratification", Astronomy & Astrophysics, 551: A30, arXiv:1301.3050, Bibcode:2013A&A...551A..30B, doi:10.1051/0004-6361/201220671, S2CID 59291051.
  11. ^ "eps Del -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-28.
  12. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  13. ^ 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.
  14. ^ Knobel, E. B. (June 1895), "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket", Monthly Notices of the Royal Astronomical Society, 55: 429–438, Bibcode:1895MNRAS..55..429K, doi:10.1093/mnras/55.8.429.
  15. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  16. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  17. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 September 29, 2009, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. ^ Allen, R. H. (1963), Star Names, Their Lore and Meaning (Dover ed.), p. 201, retrieved 2017-06-29.

January 01, 1970
epsilon, delphini, delphini, abbreviated, officially, named, aldulfin, solitary, blue, white, hued, star, northern, constellation, delphinus, visible, naked, with, apparent, visual, magnitude, based, upon, annual, parallax, shift, seen, from, earth, system, lo. Epsilon Delphini e Delphini abbreviated Eps Del e Del officially named Aldulfin ae l ˈ d ʌ l f en 12 is a solitary 13 blue white hued star in the northern constellation of Delphinus It is visible to the naked eye with an apparent visual magnitude of 4 03 2 Based upon an annual parallax shift of 9 87 mas as seen from the Earth 1 the system is located about 330 light years from the Sun At Epsilon Delphini s distance the visual magnitude is diminished by an extinction factor of 0 11 due to interstellar dust 6 The star is moving closer to the Sun with a radial velocity of 19 km s 5 e DelphiniLocation of e Delphini circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Delphinus Right ascension 20h 33m 12 77192s 1 Declination 11 18 11 7412 1 Apparent magnitude V 4 03 2 3 95 4 05 3 Characteristics Spectral type B6 III 4 U B color index 0 46 2 B V color index 0 13 2 Variable type suspected 3 AstrometryRadial velocity Rv 19 4 0 7 5 km sProper motion m RA 11 96 1 mas yr Dec 28 97 1 mas yrParallax p 9 87 0 21 mas 1 Distance330 7 ly 101 2 pc Absolute magnitude MV 0 06 6 DetailsRadius4 6 7 R Luminosity676 8 L Surface gravity log g 3 71 0 09 9 cgsTemperature13 614 15 7 KMetallicity Fe H 0 08 0 10 9 dexRotational velocity v sin i 52 4 10 km sAge220 6 Myr Other designationsAldulfin e Del 2 Del BD 10 4321 FK5 768 HD 195810 HIP 101421 HR 7852 SAO 106230 11 Database referencesSIMBADdata This is a B type giant star with a stellar classification of B6 III 4 It has 4 6 7 times the Sun s radius and is radiating 676 8 times the solar luminosity from its photosphere at an effective temperature of 13 614 K 7 The star may be slightly variable occasionally brightening to magnitude 3 95 3 It is spinning with a projected rotational velocity of 52 km s 10 Proper names edite Delphini Latinised to Epsilon Delphini is the star s Bayer designation The star bore the traditional Arabic name danab ad dulfin or Dzaneb al Delphin which appeared in the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket and which was translated into Latin as Cauda Delphini meaning the dolphin s tail 14 In 2016 the IAU organized a Working Group on Star Names WGSN 15 to catalog and standardize proper names for stars The WGSN approved the name Aldulfin for this star on 5 September 2017 and it is now so included in the List of IAU approved Star Names 12 In Chinese 敗瓜 Bai Gua meaning Rotten Gourd refers to an asterism consisting of Epsilon Delphini Eta Delphini Theta Delphini Iota Delphini and Kappa Delphini 16 Consequently the Chinese name for Epsilon Delphini itself is 敗瓜一 Bai Gua yi English the First Star of Rotten Gourd 17 From this Chinese name the name Pae Chaou was formed 18 References edit a b c d e f van Leeuwen F 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 Crawford D L et al 1971 Four color H beta and UBV photometry for bright B type stars in the northern hemisphere The Astronomical Journal 76 1058 Bibcode 1971AJ 76 1058C doi 10 1086 111220 a b c Samus N N et al January 2017 General Catalogue of Variable Stars Astronomy Reports GCVS 5 1 61 1 80 88 Bibcode 2017ARep 61 80S doi 10 1134 S1063772917010085 S2CID 125853869 a b Lesh Janet Rountree December 1968 The Kinematics of the Gould Belt an Expanding Group Astrophysical Journal Supplement 17 371 Bibcode 1968ApJS 17 371L doi 10 1086 190179 a b Gontcharov G A November 2006 Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system Astronomy Letters 32 11 759 771 arXiv 1606 08053 Bibcode 2006AstL 32 759G doi 10 1134 S1063773706110065 S2CID 119231169 a b c Gontcharov G A November 2012 Spatial distribution and kinematics of OB stars Astronomy Letters 38 11 694 706 arXiv 1606 09028 Bibcode 2012AstL 38 694G doi 10 1134 S1063773712110035 S2CID 119108982 a b c d Underhill A B et al November 1979 Effective temperatures angular diameters distances and linear radii for 160 O and B stars Monthly Notices of the Royal Astronomical Society 189 3 601 605 Bibcode 1979MNRAS 189 601U doi 10 1093 mnras 189 3 601 a b McDonald I et al 2012 Fundamental Parameters and Infrared Excesses of Hipparcos Stars Monthly Notices of the Royal Astronomical Society 427 1 343 57 arXiv 1208 2037 Bibcode 2012MNRAS 427 343M doi 10 1111 j 1365 2966 2012 21873 x S2CID 118665352 a b Wu Yue et al January 2011 Coude feed stellar spectral library atmospheric parameters Astronomy and Astrophysics 525 A71 arXiv 1009 1491 Bibcode 2011A amp A 525A 71W doi 10 1051 0004 6361 201015014 S2CID 53480665 a b Bailey J D Landstreet J D 2013 Abundances determined using Si ii and Si iii in B type stars Evidence for stratification Astronomy amp Astrophysics 551 A30 arXiv 1301 3050 Bibcode 2013A amp A 551A 30B doi 10 1051 0004 6361 201220671 S2CID 59291051 eps Del Variable Star SIMBAD Astronomical Database Centre de Donnees astronomiques de Strasbourg retrieved 2017 06 28 a b Naming Stars IAU org Retrieved 16 December 2017 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 Knobel E B June 1895 Al Achsasi Al Mouakket on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket Monthly Notices of the Royal Astronomical Society 55 429 438 Bibcode 1895MNRAS 55 429K doi 10 1093 mnras 55 8 429 IAU Working Group on Star Names WGSN Retrieved 22 May 2016 in Chinese 中國星座神話 written by 陳久金 Published by 台灣書房出版有限公司 2005 ISBN 978 986 7332 25 7 in Chinese 香港太空館 研究資源 亮星中英對照表 Archived September 29 2009 at the Wayback Machine Hong Kong Space Museum Accessed on line November 23 2010 Allen R H 1963 Star Names Their Lore and Meaning Dover ed p 201 retrieved 2017 06 29 Retrieved from https en wikipedia org w index php title Epsilon Delphini amp oldid 1170072894, wikipedia, wiki, book, books, library,

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