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Alcor, Büyük Ayı'da bulunan bir çift yıldız sistemidir. Büyük Ayı'daki Büyük Kepçe (ya da Pulluk) yıldız işaretinin sapında çıplak gözle görülebilen iki yıldızdan biri olan Mizar'ın daha sönük yoldaşıdır. Her ikisi de Hipparcos astrometri uydusu tarafından yapılan gözlemlere dayalı paralaks ölçümlerine göre Güneş'ten yaklaşık 83 ışıkyılı uzaklıkta yer almaktadır.
| Gözlem verisi Dönem J2000.0 Ekinoks J2000.0 | |
|---|---|
| Takımyıldız | Ursa Major |
| Sağ açıklık | 13sa 25d 13.53783s |
| Dik açıklık | +54° 59′ 16.6548″ |
| Görünür büyüklük (V) | +3.99 |
| Özellikler | |
| Tayfsal sınıf | A5Vn / M3-4 |
| Astrometri | |
| Dikey hız (Rv) | −9.6 km/s |
| Iraklık açısı (π) | 39.91 ± 0.13 mys |
| Uzaklık | 81,7 ± 0,3 ly (25,06 ± 0,08 pc) |
| Mutlak büyüklük (MV) | +2.00 |
| Ayrıntılar | |
| Alcor A | |
| Kütle | 1.84 M☉ |
| Yarıçap | 1.846 R☉ |
| Aydınlatma gücü | 14.03 L☉ |
| Yüzey kütle çekimi (log g) | 4.25 cgs |
| Sıcaklık | 8,221 K |
| Dönüş hızı (v sin i) | 228 km/s |
| Alcor B | |
| Kütle | 0.25 M☉ |
| (Yaş) | 0.5 ± 0.1 Milyar yıl |
| Katalog belirtmeleri | |
| Veritabanı kaynakları | |
| SIMBAD | veri |
Kaynakça
- ^ a b c van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653-664. arXiv:0708.1752 $2. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c Mamajek, Eric E.; Kenworthy, Matthew A.; Hinz, Philip M.; Meyer, Michael R. (2010). "Discovery of a Faint Companion to Alcor Using MMT/AO 5 μm Imaging". The Astronomical Journal. 139 (3): 919-925. arXiv:0911.5028 $2. Bibcode:2010AJ....139..919M. doi:10.1088/0004-6256/139/3/919.
- ^ Gray, R. O; Garrison, R. F (1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349
![image]()
. - ^ a b Zimmerman, Neil; Oppenheimer, Ben R; Hinkley, Sasha; Brenner, Douglas; Parry, Ian R; Sivaramakrishnan, Anand; Hillenbrand, Lynne; Beichman, Charles; Crepp, Justin R; Vasisht, Gautam; Roberts, Lewis C; Burruss, Rick; King, David L; Soummer, Rémi; Dekany, Richard; Shao, Michael; Bouchez, Antonin; Roberts, Jennifer E; Hunt, Stephanie (2010). "Parallactic Motion for Companion Discovery: An M-Dwarf Orbiting Alcor". The Astrophysical Journal. 709 (2): 733-740. arXiv:0912.1597 $2. Bibcode:2010ApJ...709..733Z. doi:10.1088/0004-637X/709/2/733.
- ^ Kidger, Mark R; Martín-Luis, Fabiola (2003). "High-Precision Near-Infrared Photometry of a Large Sample of Bright Stars Visible from the Northern Hemisphere". The Astronomical Journal. 125 (6): 3311. Bibcode:2003AJ....125.3311K. doi:10.1086/374996
![image]()
. - ^ a b c Zorec, J; Royer, F (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052 $2. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
- ^ Jones, Jeremy; White, R. J; Boyajian, T; Schaefer, G; Baines, E; Ireland, M; Patience, J; Ten Brummelaar, T; McAlister, H; Ridgway, S. T; Sturmann, J; Sturmann, L; Turner, N; Farrington, C; Goldfinger, P. J (2015). "The Ages of A-Stars. I. Interferometric Observations and Age Estimates for Stars in the Ursa Major Moving Group". The Astrophysical Journal. 813 (1): 58. arXiv:1508.05643 $2. Bibcode:2015ApJ...813...58J. doi:10.1088/0004-637X/813/1/58.
- ^ a b 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 $2. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.
- ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. bas.). Cambridge, Massachusetts: Sky Pub. ISBN .
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Alcor Buyuk Ayi da bulunan bir cift yildiz sistemidir Buyuk Ayi daki Buyuk Kepce ya da Pulluk yildiz isaretinin sapinda ciplak gozle gorulebilen iki yildizdan biri olan Mizar in daha sonuk yoldasidir Her ikisi de Hipparcos astrometri uydusu tarafindan yapilan gozlemlere dayali paralaks olcumlerine gore Gunes ten yaklasik 83 isikyili uzaklikta yer almaktadir AlcorAlcor un konumu Mizar daire icine alinmistir Alcor bu olcekte yaninda gorulemez Gozlem verisi Donem J2000 0 Ekinoks J2000 0Takimyildiz Ursa MajorSag aciklik 13sa 25d 13 53783sDik aciklik 54 59 16 6548 Gorunur buyukluk V 3 99OzelliklerTayfsal sinif A5Vn M3 4AstrometriDikey hiz Rv 9 6 km sIraklik acisi p 39 91 0 13 mysUzaklik81 7 0 3 ly 25 06 0 08 pc Mutlak buyukluk MV 2 00AyrintilarAlcor AKutle1 84 M Yaricap1 846 R Aydinlatma gucu14 03 L Yuzey kutle cekimi log g 4 25 cgsSicaklik8 221 KDonus hizi v sin i 228 km sAlcor BKutle0 25 M Yas0 5 0 1 Milyar yilKatalog belirtmelerig Ursae Majoris 80 Ursae Majoris 55 1603 J13240 5456D 18155 HD 116842 65477 HR 5062 34021 SAO 28751 J13239 5456CVeritabani kaynaklariSIMBADveriKaynakca a b c van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 2 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 a b c Mamajek Eric E Kenworthy Matthew A Hinz Philip M Meyer Michael R 2010 Discovery of a Faint Companion to Alcor Using MMT AO 5 mm Imaging The Astronomical Journal 139 3 919 925 arXiv 0911 5028 2 Bibcode 2010AJ 139 919M doi 10 1088 0004 6256 139 3 919 Gray R O Garrison R F 1989 The late A type stars Refined MK classification confrontation with Stromgren photometry and the effects of rotation Astrophysical Journal Supplement Series 70 623 Bibcode 1989ApJS 70 623G doi 10 1086 191349 a b Zimmerman Neil Oppenheimer Ben R Hinkley Sasha Brenner Douglas Parry Ian R Sivaramakrishnan Anand Hillenbrand Lynne Beichman Charles Crepp Justin R Vasisht Gautam Roberts Lewis C Burruss Rick King David L Soummer Remi Dekany Richard Shao Michael Bouchez Antonin Roberts Jennifer E Hunt Stephanie 2010 Parallactic Motion for Companion Discovery An M Dwarf Orbiting Alcor The Astrophysical Journal 709 2 733 740 arXiv 0912 1597 2 Bibcode 2010ApJ 709 733Z doi 10 1088 0004 637X 709 2 733 Kidger Mark R Martin Luis Fabiola 2003 High Precision Near Infrared Photometry of a Large Sample of Bright Stars Visible from the Northern Hemisphere The Astronomical Journal 125 6 3311 Bibcode 2003AJ 125 3311K doi 10 1086 374996 a b c Zorec J Royer F 2012 Rotational velocities of A type stars IV Evolution of rotational velocities Astronomy amp Astrophysics 537 A120 arXiv 1201 2052 2 Bibcode 2012A amp A 537A 120Z doi 10 1051 0004 6361 201117691 Jones Jeremy White R J Boyajian T Schaefer G Baines E Ireland M Patience J Ten Brummelaar T McAlister H Ridgway S T Sturmann J Sturmann L Turner N Farrington C Goldfinger P J 2015 The Ages of A Stars I Interferometric Observations and Age Estimates for Stars in the Ursa Major Moving Group The Astrophysical Journal 813 1 58 arXiv 1508 05643 2 Bibcode 2015ApJ 813 58J doi 10 1088 0004 637X 813 1 58 a b 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 2 Bibcode 2015ApJ 804 146D doi 10 1088 0004 637X 804 2 146 Kunitzsch Paul Smart Tim 2006 A Dictionary of Modern star Names A Short Guide to 254 Star Names and Their Derivations 2nd rev bas Cambridge Massachusetts Sky Pub ISBN 978 1 931559 44 7