القفزة الثانية الجنوبية

(تم التحويل من القفزة الثاني الجنوبي)
Mu Ursae Majoris
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings
Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings

Location of μ Ursae Majoris (circled)
بيانات الرصـد
الحقبة J2000      اعتدال J2000
الكوكبة Ursa Major
الصعود المستقيم 10h 22m 19.73976s[1]
الميل +41° 29′ 58.2691″[1]
القدر الظاهري (V)+3.06[2]
الخـصـائص
النوع الطيفيM0 IIIab[2]
U-B دليل الألوان+1.90[3]
B-V دليل الألوان+1.59[3]
النوع المتغيرsuspected[4]
علم القياسات الفلكية
السرعة القطرية (Rv)−21.30±1.66[5] كم/ث
الحركة الحقيقية (μ) RA: –81.47[1] mas/yr
Dec.: +35.34[1] mas/س
اختلاف المنظر (π)14.16 ± 0.54[1] mas
المسافةس ض
( ف ن)
القدر المطلق (MV)−1.11±0.083[6]
المدار[7]
الدورة (P)230.089 days
Semimajor axis (a)0.0028"
اختلاف المركز (e)0.061
ميل (i)13.6°
نقطة التقارب الحقبة (T)2425577.030 JD
Argument of periastron (ω)
(secondary)		236.4°
Semi-amplitude (K1)
(primary)		7.40 كم/s
التـفـاصـيل
الكتلة6.3[8] M☉
نصف القطر75[9] R☉
الضياء977[9]–1,200[5] L☉
جاذبية السطح (ج)1.0[5] س.ج.ث.
درجة الحرارة3,899[5] ك
المعدنية [Fe/H]+0.00[10] العشرية
تسارع الدوران (v sin i)7.5[5] كم/ث
companion
الكتلة0.96[8] M☉
تسميات أخرى
Tania Australis, Alkafzah al Thaniyah, μ Ursae Majoris, μ UMa, Mu UMa, 34 Ursae Majoris, BD+42 2115, FK5 386, GC 14232, HD 89758, HIP 50801, HR 4069, PPM 51850, SAO 43310
مراجع قواعد البيانات
SIMBADdata

القفزة الثانية الجنوبية أو ميو الدب الأكبر Mu Ursae Majoris اسمه التقليدي Tania Australis مشتق من الاسم العربي.[11] وهو نجم في كوكبة الدب الأكبر. ويسمى رسمياً Tania Australis /ˈteɪniə ɔːˈstreɪlɪs/,[12][13] is a binary star in the constellation of Ursa Major. An apparent visual magnitude of +3.06[2] places it among the brighter members of the constellation. Parallax measurements give an estimated distance of roughly 230 light-years (71 parsecs) from the Sun, with a margin of error of 4%.[1]

النظام النجمي

القفزة الثاني الجنوبي عملاق أحمر ينتمي إلى الفئة الطيفية M والقدر الظاهري 3.0m. ويبعد 250 سنة ضوئية عن الأرض ويعتبر نجم متغير ويتراوح سطوعه ما بين قدر 2.99m to 3.33m. وقد ثبت بالتحليل الطيفي من أنه نجم مزدوج ورفيقه يبعد 1.5 وحدة فلكية والفترة المدارية 230 يوم.

Mu Ursae Majoris is an evolved star that is currently in the red giant stage with a stellar classification of M0 IIIab.[2] It has expanded to 75[9] times the radius of the Sun whilst the outer atmosphere has cooled to an effective temperature of 3,899 K,[5] giving it the orange-red hued glow of an M-type star.[14] Estimates of the luminosity range from 977[9]–1,200[5] times that of the Sun. It is classified as a suspected variable star with a brightness variation from magnitude 2.99m to 3.33m.[4]

This is a spectroscopic binary star system with a companion a mere 0.2 AU from the primary, assuming a distance of 71 parsecs, with an orbital period of 230 days.[7]


التسمية

μ Ursae Majoris (Latinised to Mu Ursae Majoris) is the star's Bayer designation.

It bore the traditional names Tania (shared with Lambda Ursae Majoris) and Tania Australis. Tania comes from the Arabic phrase Al Fiḳrah al Thānia 'the Second Spring (of the Gazelle)'.[15] and Australis (originally australis[16]) is Latin for 'the south side'. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[17] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[18] included a table of the first two batches of names approved by the WGSN; which included Tania Australis for this star.

In Chinese, 三台 (Sān Tái), meaning Three Steps, refers to an asterism consisting of Mu Ursae Majoris, Iota Ursae Majoris, Kappa Ursae Majoris, Lambda Ursae Majoris, Nu Ursae Majoris and Xi Ursae Majoris. Consequently, the Chinese name for Mu Ursae Majoris itself is 中台二 (Zhōng Tái èr, إنگليزية: Star of Second Middle Step).[19]

انظر أيضاً

المراجع

  1. ^ أ ب ت ث ج ح van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V  Note: see VizieR catalogue I/311.
  2. ^ أ ب ت ث Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics 352: 495–507, Bibcode: 1999A&A...352..495M 
  3. ^ أ ب 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. ^ أ ب Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. ^ أ ب ت ث ج ح خ Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M 
  6. ^ Park, Sunkyung; Kang, Wonseok; Lee, Jeong-Eun; Lee, Sang-Gak (2013), "Wilson-Bappu Effect: Extended to Surface Gravity", The Astronomical Journal 146 (4): 73, doi:10.1088/0004-6256/146/4/73, Bibcode: 2013AJ....146...73P. 
  7. ^ أ ب Ren, Shulin; Fu, Yanning (2013). "Hipparcos Photocentric Orbits of 72 Single-lined Spectroscopic Binaries". The Astronomical Journal. 145 (3): 81. Bibcode:2013AJ....145...81R. doi:10.1088/0004-6256/145/3/81. S2CID 120199240.
  8. ^ أ ب Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars". Bulletin d'Information du Centre de Donnees Stellaires. 19: 71. Bibcode:1980BICDS..19...71K. ISSN 1169-8837.
  9. ^ أ ب ت ث Jorissen, A.; Frankowski, A.; Famaey, B.; van Eck, S. (May 2009), "Spectroscopic binaries among Hipparcos M giants. III. The eccentricity - period diagram and mass-transfer signatures", Astronomy and Astrophysics 498 (2): 489–500, doi:10.1051/0004-6361/200810703, Bibcode: 2009A&A...498..489J 
  10. ^ Mallik, Sushma V. (October 1998), "Chromospheric activity in cool stars and the lithium abundance", Astronomy and Astrophysics 338: 623–636, Bibcode: 1998A&A...338..623M 
  11. ^ Burritt, E. H., Atlas, Designed to Illustrate the Geography of the Heavens, New York, 1835.
  12. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  13. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  14. ^ The Colour of Stars, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved on 2012-01-16 
  15. ^ Richard Hinckley Allen. "Star Names — Their Lore and Meaning - Ursa Major, the Greater Bear". Retrieved 2016-08-26.
  16. ^ Piazzi, G. (1814), The Palermo Catalogue, Palermo 
  17. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  18. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  19. ^ "(Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 21 日" (in الصينية). Archived from the original on 2016-03-03. Retrieved 2016-08-26.
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