تاو العذراء

تاو العذراء
معلومات الرصد
حقبة J2000      اعتدالان J2000
كوكبة العذراء
مطلع مستقيم 14سا 01د 38.79341ث[1]
الميل +01° 32′ 40.3145″[1]
القدر الظاهري (V) 4.2777±0.0007[2]
الخصائص
مرحلة التطور A2IV/V[3]
مرحلة التطور A2IV/V[3]
U−B مؤشر اللون +0.12[4]
B−V مؤشر اللون +0.11[4]
القياسات الفلكية
السرعة الشعاعية (Rv) −6.7±0.9[5] كم/ث
الحركة الخاصة (μ) +17.49[1]−21.27[1]
التزيح (π) 14.50 د.ق
البعد 224.93543448276 س.ض
(68.965517241379 ف.ف)
القدر المطلق (MV) +0.5[6]
تفاصيل
كتلة 1.96[7] ك
نصف قطر 1.6[8] نق
إضاءة 70[9] ض
جاذبية سطحية (log g) 3.39[7] سم.غ.ثا
درجة الحرارة 8,413±286[7] ك
معدنية [Fe/H] −0.19[10] dex
عمر 724[7] م.سنة
تسميات اخرى
τ Vir، 93 Virginis, BD+02° 2761, فهرس النجوم الأساسية 516, HD 122408, HIP 68520, HR 5264, SAO 120238.[11]

تاو العذراء (τ Vir, τ Virginis) نجم منفرد في كوكبة العذراء [12] بقدر ظاهري 4.28 [2] المسافة إلى تاو العذراء، استنادا إلى قياسات اختلاف المنظر النجمي تعادل 225 سنة ضوئية تقريباً مع هامش خطأ ± 3 سنة ضوئية.التصنيف النجمي A2IV/V,[3] نجم من نجوم النسق الأساسي نوع-A يبلغ عمرة حولي 700 مليون سنة[7] ويدور حول نفسة بسرعة 186 كم/ث .[13] وتقدر كتلة هذا النجم بضعف كتلة الشمس ويعادل نصف قطرة 160٪ من نصف قطر الشمس [8][9] ويضيء اشد بي 70 ضعف سطوع الشمس ودرجة حرارة الغلاف الجوي الخارجي 8413 كلفن .[7]

مراجع

  1. ^ ا ب ج د van Leeuwen، F. (نوفمبر 2007)، "Validation of the new Hipparcos reduction"، Astronomy and Astrophysics، ج. 474، ص. 653–664، arXiv:0708.1752، Bibcode:2007A&A...474..653V، DOI:10.1051/0004-6361:20078357.
  2. ^ ا ب Adelman، S. J. (فبراير 2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics. ج. 367 ع. 1: 297–298. Bibcode:2001A&A...367..297A. DOI:10.1051/0004-6361:20000567.{{استشهاد بدورية محكمة}}: صيانة الاستشهاد: postscript (link)
  3. ^ ا ب Houk، N.؛ Swift، C. (1999)، "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5"، Michigan Spectral Survey، ج. 05، Bibcode:1999MSS...C05....0H
  4. ^ ا ب Mermilliod، J.-C. (1986)، Compilation of Eggen's UBV data, transformed to UBV (unpublished)، SIMBAD، Bibcode:1986EgUBV........0M
  5. ^ Gontcharov، G. A. (2006)، "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system"، Astronomy Letters، ج. 32، ص. 759، Bibcode:2006AstL...32..759G، DOI:10.1134/S1063773706110065.
  6. ^ Blondel، P. F. C.؛ Djie، H. R. E. Tjin A. (سبتمبر 2006)، "Modeling of PMS Ae/Fe stars using UV spectra"، Astronomy and Astrophysics، ج. 456، ص. 1045−1068، Bibcode:2006A&A...456.1045B، DOI:10.1051/0004-6361:20040269.
  7. ^ ا ب ج د ه و 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، ج. 804، ص. 146، arXiv:1501.03154، Bibcode:2015ApJ...804..146D، DOI:10.1088/0004-637X/804/2/146.
  8. ^ ا ب Pasinetti Fracassini، L. E.؛ وآخرون (فبراير 2001)، "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics"، Astronomy and Astrophysics، ج. 367، ص. 521–524، arXiv:astro-ph/0012289، Bibcode:2001A&A...367..521P، DOI:10.1051/0004-6361:20000451.
  9. ^ ا ب McDonald، I.؛ وآخرون (2012)، "Fundamental Parameters and Infrared Excesses of Hipparcos Stars"، Monthly Notices of the Royal Astronomical Society، ج. 427، ص. 343–57، arXiv:1208.2037، Bibcode:2012MNRAS.427..343M، DOI:10.1111/j.1365-2966.2012.21873.x.
  10. ^ Morossi، C.؛ وآخرون (سبتمبر 2002)، "Metallicity Determinations from Ultraviolet-Visual Spectrophotometry. I. The Test Sample"، The Astrophysical Journal، ج. 577، ص. 377−388، Bibcode:2002ApJ...577..377M، DOI:10.1086/342144.
  11. ^ "tau Vir -- Star"، SIMBAD Astronomical Database، Centre de Données astronomiques de Strasbourg، مؤرشف من الأصل في 2016-03-04، اطلع عليه بتاريخ 2016-09-16.
  12. ^ Eggleton، P. P.؛ Tokovinin، A. A. (سبتمبر 2008)، "A catalogue of multiplicity among bright stellar systems"، Monthly Notices of the Royal Astronomical Society، ج. 389، ص. 869–879، arXiv:0806.2878، Bibcode:2008MNRAS.389..869E، DOI:10.1111/j.1365-2966.2008.13596.x.
  13. ^ Royer، F.؛ وآخرون (فبراير 2007)، "Rotational velocities of A-type stars. III. Velocity distributions"، Astronomy and Astrophysics، ج. 463، ص. 671–682، arXiv:astro-ph/0610785، Bibcode:2007A&A...463..671R، DOI:10.1051/0004-6361:20065224.

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