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Tau2 Arietis

January 01, 1970

For other stars with this Bayer designation, see τ Arietis.

Tau2 Arietis, Latinized from τ2 Arietis, is the Bayer designation for a binary star[7] in the northern constellation on Aries. The combined apparent visual magnitude of this system is +5.09,[2] which is bright enough to be seen with the naked eye. With an annual parallax shift of 10.27 mas,[1] it is located at a distance of approximately 320 light-years (98 parsecs) from Earth, give or take a 20 light-year margin of error. At this distance the brightness of the star is diminished by 0.18 in magnitude because of extinction from interstellar gas and dust.[8]

τ2
Location of τ2 Arietis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension 03h 22m 45.24006s[1]
Declination +20° 44′ 31.4382″[1]
Apparent magnitude (V) +5.09[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.27[2]
B−V color index 1.238[4]
Astrometry
Radial velocity (Rv)+2.45 ± 0.24[4] km/s
Proper motion (μ) RA: –51.59[1] mas/yr
Dec.: –16.06[1] mas/yr
Parallax (π)10.27 ± 0.60 mas[1]
Distance320 ± 20 ly
(97 ± 6 pc)
Absolute magnitude (MV)+0.17[5]
Details
Radius19[4] R☉
Luminosity120[4] L☉
Surface gravity (log g)2.1[4] cgs
Temperature4,406[4] K
Metallicity [Fe/H]+0.02[4] dex
Rotational velocity (v sin i)3.4[4] km/s
Other designations
τ2 Ari, 63 Arietis, BD+20 551, HD 20893, HIP 15737, HR 1015, SAO 75899.[6]
Database references
SIMBADdata

The primary component is an evolved giant star with a stellar classification of K3 III.[9] It has expanded to 19 times the radius of the Sun, from which it is radiating 120 times the Sun's luminosity.[4] This energy is being emitted into outer space from the outer atmosphere at an effective temperature of 4,406 K,[4] giving it the cool orange glow of a K-type star. At an angular separation of 0.53 arcseconds is a magnitude 8.50 companion.[7]

References edit

  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 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
  3. ^ Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x, S2CID 119428437.
  4. ^ a b c d e f g h i j 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, S2CID 121883397.
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  6. ^ "63 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.{{cite web}}: CS1 maint: postscript (link)
  7. ^ a b 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.
  8. ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304
  9. ^ Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.

External links edit

  • Aladin previewer
  • Aladin sky atlas
  • HR 1015

January 01, 1970
tau2, arietis, other, stars, with, this, bayer, designation, arietis, latinized, from, arietis, bayer, designation, binary, star, northern, constellation, aries, combined, apparent, visual, magnitude, this, system, which, bright, enough, seen, with, naked, wit. For other stars with this Bayer designation see t Arietis Tau2 Arietis Latinized from t2 Arietis is the Bayer designation for a binary star 7 in the northern constellation on Aries The combined apparent visual magnitude of this system is 5 09 2 which is bright enough to be seen with the naked eye With an annual parallax shift of 10 27 mas 1 it is located at a distance of approximately 320 light years 98 parsecs from Earth give or take a 20 light year margin of error At this distance the brightness of the star is diminished by 0 18 in magnitude because of extinction from interstellar gas and dust 8 t2Location of t2 Arietis circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Aries Right ascension 03h 22m 45 24006s 1 Declination 20 44 31 4382 1 Apparent magnitude V 5 09 2 Characteristics Spectral type K3 III 3 U B color index 1 27 2 B V color index 1 238 4 AstrometryRadial velocity Rv 2 45 0 24 4 km sProper motion m RA 51 59 1 mas yr Dec 16 06 1 mas yrParallax p 10 27 0 60 mas 1 Distance320 20 ly 97 6 pc Absolute magnitude MV 0 17 5 DetailsRadius19 4 R Luminosity120 4 L Surface gravity log g 2 1 4 cgsTemperature4 406 4 KMetallicity Fe H 0 02 4 dexRotational velocity v sin i 3 4 4 km s Other designationst2 Ari 63 Arietis BD 20 551 HD 20893 HIP 15737 HR 1015 SAO 75899 6 Database referencesSIMBADdata The primary component is an evolved giant star with a stellar classification of K3 III 9 It has expanded to 19 times the radius of the Sun from which it is radiating 120 times the Sun s luminosity 4 This energy is being emitted into outer space from the outer atmosphere at an effective temperature of 4 406 K 4 giving it the cool orange glow of a K type star At an angular separation of 0 53 arcseconds is a magnitude 8 50 companion 7 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 Argue A N 1966 UBV photometry of 550 F G and K type stars Monthly Notices of the Royal Astronomical Society 133 4 475 Bibcode 1966MNRAS 133 475A doi 10 1093 mnras 133 4 475 Cenarro A J et al January 2007 Medium resolution Isaac Newton Telescope library of empirical spectra II The stellar atmospheric parameters Monthly Notices of the Royal Astronomical Society 374 2 664 690 arXiv astro ph 0611618 Bibcode 2007MNRAS 374 664C doi 10 1111 j 1365 2966 2006 11196 x S2CID 119428437 a b c d e f g h i j 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 S2CID 121883397 Anderson E Francis Ch 2012 XHIP An extended hipparcos compilation Astronomy Letters 38 5 331 arXiv 1108 4971 Bibcode 2012AstL 38 331A doi 10 1134 S1063773712050015 S2CID 119257644 63 Ari SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2012 07 18 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link a b 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 Famaey B et al January 2005 Local kinematics of K and M giants from CORAVEL Hipparcos Tycho 2 data Revisiting the concept of superclusters Astronomy and Astrophysics 430 1 165 186 arXiv astro ph 0409579 Bibcode 2005A amp A 430 165F doi 10 1051 0004 6361 20041272 S2CID 17804304 Roman Nancy G July 1952 The Spectra of the Bright Stars of Types F5 K5 Astrophysical Journal 116 122 Bibcode 1952ApJ 116 122R doi 10 1086 145598 External links editAladin previewer Aladin sky atlas HR 1015 Retrieved from https en wikipedia org w index php title Tau2 Arietis amp oldid 1170118864, wikipedia, wiki, book, books, library,

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