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Sigma Tauri

October 16, 2023

Sigma Tauri (σ Tauri) is the Bayer designation for a pair of white-hued stars in the zodiac constellation of Taurus. The system is a visual double star, whose components are designated σ1 Tauri and σ2 Tauri, with the latter being the more northerly star.[15] The two are separated by 7.2[16] arcminutes on the sky and can be readily split with a pair of binoculars.[15] They have apparent visual magnitudes of +5.07[2] and +4.70,[3] respectively, which indicates they are both visible to the naked eye. Based upon parallax measurements, σ1 Tauri is about 147 light years from the Sun, while σ2 Tauri is 156 light years distant.

Sigma Tauri
Location of σ2 Tauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Taurus
σ1 Tau
Right ascension 04h 39m 09.22247s[1]
Declination +15° 47′ 59.5345″[1]
Apparent magnitude (V) 5.07[2]
σ2 Tau
Right ascension 04h 39m 16.50230s[1]
Declination +15° 55′ 04.7029″[1]
Apparent magnitude (V) 4.70[3]
Characteristics
σ1 Tau
Spectral type A4m[4]
U−B color index 0.190[2]
B−V color index 0.146[2]
σ2 Tau
Spectral type A5 Vn[5]
U−B color index +0.13[3]
B−V color index +0.14[3]
Astrometry
σ1 Tau
Radial velocity (Rv)+26.1±10.0[6] km/s
Proper motion (μ) RA: +41.91[1] mas/yr
Dec.: −66.88[1] mas/yr
Parallax (π)22.18 ± 0.93 mas[1]
Distance147 ± 6 ly
(45 ± 2 pc)
Absolute magnitude (MV)1.73[2]
σ2 Tau
Radial velocity (Rv)+40.8±1.2[6] km/s
Proper motion (μ) RA: +83.17[1] mas/yr
Dec.: −20.97[1] mas/yr
Parallax (π)20.97 ± 0.27 mas[1]
Distance156 ± 2 ly
(47.7 ± 0.6 pc)
Orbit[7]
Primaryσ1 Tau A
Companionσ1 Tau B
Period (P)38.951 d
Eccentricity (e)0.15
Longitude of the node (Ω)82°
Periastron epoch (T)2443094.319 JD
Semi-amplitude (K1)
(primary)		7.9 km/s
Details
σ1 Tau
Mass1.94[2] M☉
Luminosity14.7[8] L☉
Surface gravity (log g)4.08[2] cgs
Temperature8,470[2] K
Rotational velocity (v sin i)56.5±7.1[9] km/s
σ2 Tau
Mass1.71[10] M☉
Radius1.9[11] R☉
Luminosity22.5[8] L☉
Surface gravity (log g)3.96[10] cgs
Temperature8,165±278[10] K
Metallicity [Fe/H]0.10±0.11[12] dex
Rotational velocity (v sin i)128[5] km/s
Age258[10] Myr
Other designations
σ Tau, WDS J04393+1555
σ1 Tau: 91 Tauri, BD+15° 665, HD 29479, HIP 21673, HR 1478, SAO 94051[13]
σ2 Tau: 92 Tauri, BD+15° 666, FK5 2345, HD 29488, HIP 21683, HR 1479, SAO 94054[14]
Database references
SIMBADσ1 Tau
σ2 Tau

σ1 Tauri is a single-lined spectroscopic binary star system with an orbital period of 38.951 days and an eccentricity of 0.15. The visible component is an Am star with a stellar classification of A4m,[4] indicating it is chemically peculiar A-type star. It is spinning with a projected rotational velocity of 56.5 km/s.[9] The star has 1.9[2] times the mass of the Sun and is radiating 14.7[8] times the Sun's luminosity from its photosphere at an effective temperature of 8,470 K.[2] Although it lies in the general direction of the Hyades cluster, based on parallax measurements it has been excluded from the list of candidate members.[2]

σ2 Tauri is a solitary[17] A-type main sequence star with a stellar classification of A5 Vn.[5] The 'n' suffix indicates the lines are "nebulous" due to rapid rotation, and indeed it is spinning with a projected rotational velocity of 128 km/s.[5] The star is an estimated 258[10] million years old, with 1.7[10] times the mass of the Sun. It is radiating 22.5[8] times the Sun's luminosity from its photosphere at an effective temperature of around 8,165 K.[10] The star is considered a member of the Hyades cluster.[11]

In Chinese astronomy, σ2 Tauri is called 附耳, Pinyin: Fùěr, meaning Whisper, because this star is marking itself and stands alone in the Whisper asterism of the Net mansion (see : Chinese constellation).[18]

References Edit

  1. ^ a b c d e f g h i j 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 e f g h i j k Iliev, I. Kh.; et al. (August 2006), "Abundance analysis of Am binaries and search for tidally driven abundance anomalies - II. HD861, HD18778, HD20320, HD29479, HD96528 and HD108651", Monthly Notices of the Royal Astronomical Society, 370 (2): 819–827, Bibcode:2006MNRAS.370..819I, doi:10.1111/j.1365-2966.2006.10513.x, S2CID 56133360.
  3. ^ 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.
  4. ^ a b Cowley, A.; et al. (1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. ^ a b c d Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  6. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  7. ^ Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
  8. ^ a b c d 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 Paunzen, E.; et al. (February 2013), "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 429 (1): 119–125, arXiv:1211.1535, Bibcode:2013MNRAS.429..119P, doi:10.1093/mnras/sts318, S2CID 119231581.
  10. ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  11. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  12. ^ Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
  13. ^ "sig01 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-06.{{cite web}}: CS1 maint: postscript (link)
  14. ^ "sig02 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-06.{{cite web}}: CS1 maint: postscript (link)
  15. ^ a b Burnham, Robert (2013), Burnham's Celestial Handbook, volume 3: An Observer's Guide to the Universe Beyond the Solar System, Dover Books on Astronomy, vol. 3, Courier Corporation, p. 1825, ISBN 978-0486318035
  16. ^ O'Meara, Stephen James (2016), Deep-Sky Companions: The Caldwell Objects, Cambridge University Press, p. 195, ISBN 978-1107083974.
  17. ^ 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.
  18. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 23 日

October 16, 2023
sigma, tauri, tauri, bayer, designation, pair, white, hued, stars, zodiac, constellation, taurus, system, visual, double, star, whose, components, designated, tauri, tauri, with, latter, being, more, northerly, star, separated, arcminutes, readily, split, with. Sigma Tauri s Tauri is the Bayer designation for a pair of white hued stars in the zodiac constellation of Taurus The system is a visual double star whose components are designated s1 Tauri and s2 Tauri with the latter being the more northerly star 15 The two are separated by 7 2 16 arcminutes on the sky and can be readily split with a pair of binoculars 15 They have apparent visual magnitudes of 5 07 2 and 4 70 3 respectively which indicates they are both visible to the naked eye Based upon parallax measurements s1 Tauri is about 147 light years from the Sun while s2 Tauri is 156 light years distant Sigma TauriLocation of s2 Tauri circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Tauruss1 TauRight ascension 04h 39m 09 22247s 1 Declination 15 47 59 5345 1 Apparent magnitude V 5 07 2 s2 TauRight ascension 04h 39m 16 50230s 1 Declination 15 55 04 7029 1 Apparent magnitude V 4 70 3 Characteristicss1 TauSpectral type A4m 4 U B color index 0 190 2 B V color index 0 146 2 s2 TauSpectral type A5 Vn 5 U B color index 0 13 3 B V color index 0 14 3 Astrometrys1 TauRadial velocity Rv 26 1 10 0 6 km sProper motion m RA 41 91 1 mas yr Dec 66 88 1 mas yrParallax p 22 18 0 93 mas 1 Distance147 6 ly 45 2 pc Absolute magnitude MV 1 73 2 s2 TauRadial velocity Rv 40 8 1 2 6 km sProper motion m RA 83 17 1 mas yr Dec 20 97 1 mas yrParallax p 20 97 0 27 mas 1 Distance156 2 ly 47 7 0 6 pc Orbit 7 Primarys1 Tau ACompanions1 Tau BPeriod P 38 951 dEccentricity e 0 15Longitude of the node W 82 Periastron epoch T 2443094 319 JDSemi amplitude K1 primary 7 9 km sDetailss1 TauMass1 94 2 M Luminosity14 7 8 L Surface gravity log g 4 08 2 cgsTemperature8 470 2 KRotational velocity v sin i 56 5 7 1 9 km ss2 TauMass1 71 10 M Radius1 9 11 R Luminosity22 5 8 L Surface gravity log g 3 96 10 cgsTemperature8 165 278 10 KMetallicity Fe H 0 10 0 11 12 dexRotational velocity v sin i 128 5 km sAge258 10 MyrOther designationss Tau WDS J04393 1555s1 Tau 91 Tauri BD 15 665 HD 29479 HIP 21673 HR 1478 SAO 94051 13 s2 Tau 92 Tauri BD 15 666 FK5 2345 HD 29488 HIP 21683 HR 1479 SAO 94054 14 Database referencesSIMBADs1 Taus2 Taus1 Tauri is a single lined spectroscopic binary star system with an orbital period of 38 951 days and an eccentricity of 0 15 The visible component is an Am star with a stellar classification of A4m 4 indicating it is chemically peculiar A type star It is spinning with a projected rotational velocity of 56 5 km s 9 The star has 1 9 2 times the mass of the Sun and is radiating 14 7 8 times the Sun s luminosity from its photosphere at an effective temperature of 8 470 K 2 Although it lies in the general direction of the Hyades cluster based on parallax measurements it has been excluded from the list of candidate members 2 s2 Tauri is a solitary 17 A type main sequence star with a stellar classification of A5 Vn 5 The n suffix indicates the lines are nebulous due to rapid rotation and indeed it is spinning with a projected rotational velocity of 128 km s 5 The star is an estimated 258 10 million years old with 1 7 10 times the mass of the Sun It is radiating 22 5 8 times the Sun s luminosity from its photosphere at an effective temperature of around 8 165 K 10 The star is considered a member of the Hyades cluster 11 In Chinese astronomy s2 Tauri is called 附耳 Pinyin Fuer meaning Whisper because this star is marking itself and stands alone in the Whisper asterism of the Net mansion see Chinese constellation 18 References Edit a b c d e f g h i j 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 e f g h i j k Iliev I Kh et al August 2006 Abundance analysis of Am binaries and search for tidally driven abundance anomalies II HD861 HD18778 HD20320 HD29479 HD96528 and HD108651 Monthly Notices of the Royal Astronomical Society 370 2 819 827 Bibcode 2006MNRAS 370 819I doi 10 1111 j 1365 2966 2006 10513 x S2CID 56133360 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 Cowley A et al 1969 A study of the bright A stars I A catalogue of spectral classifications Astronomical Journal 74 375 406 Bibcode 1969AJ 74 375C doi 10 1086 110819 a b c d Royer F et al February 2007 Rotational velocities of A type stars III Velocity distributions Astronomy and Astrophysics 463 2 671 682 arXiv astro ph 0610785 Bibcode 2007A amp A 463 671R doi 10 1051 0004 6361 20065224 S2CID 18475298 a b de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 Pourbaix D et al 2004 SB9 The ninth catalogue of spectroscopic binary orbits Astronomy and Astrophysics 424 2 727 732 arXiv astro ph 0406573 Bibcode 2004A amp A 424 727P doi 10 1051 0004 6361 20041213 S2CID 119387088 a b c d 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 Paunzen E et al February 2013 A photometric study of chemically peculiar stars with the STEREO satellites II Non magnetic chemically peculiar stars Monthly Notices of the Royal Astronomical Society 429 1 119 125 arXiv 1211 1535 Bibcode 2013MNRAS 429 119P doi 10 1093 mnras sts318 S2CID 119231581 a b c d e f g David Trevor J Hillenbrand Lynne A 2015 The Ages of Early Type Stars Stromgren Photometric Methods Calibrated Validated Tested and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets The Astrophysical Journal 804 2 146 arXiv 1501 03154 Bibcode 2015ApJ 804 146D doi 10 1088 0004 637X 804 2 146 S2CID 33401607 a b Pasinetti Fracassini L E et al February 2001 Catalogue of Apparent Diameters and Absolute Radii of Stars CADARS Astronomy and Astrophysics Third ed 367 521 524 arXiv astro ph 0012289 Bibcode 2001A amp A 367 521P doi 10 1051 0004 6361 20000451 S2CID 425754 Soubiran C et al June 2010 The PASTEL catalogue of stellar parameters Astronomy and Astrophysics 515 A111 arXiv 1004 1069 Bibcode 2010A amp A 515A 111S doi 10 1051 0004 6361 201014247 S2CID 118362423 sig01 Tau SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 08 06 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link sig02 Tau SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 08 06 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link a b Burnham Robert 2013 Burnham s Celestial Handbook volume 3 An Observer s Guide to the Universe Beyond the Solar System Dover Books on Astronomy vol 3 Courier Corporation p 1825 ISBN 978 0486318035 O Meara Stephen James 2016 Deep Sky Companions The Caldwell Objects Cambridge University Press p 195 ISBN 978 1107083974 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 23 日 Retrieved from https en wikipedia org w index php title Sigma Tauri amp oldid 1141852276, wikipedia, wiki, book, books, library,

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