게자리 감마

게자리 감마
Gamma Cancri

게자리 감마의 위치
관측 정보
역기점 J2000.0      분점 J2000.0 (ICRS)
별자리 게자리
적경 08h 43m 17.14820s[1]
적위 +21° 28′ 06.6008″[1]
겉보기등급 (V) 4.673[2]
특성
스펙트럼 종류 A1IV[3]
U−B 색지수 +0.03[4]
B−V 색지수 +0.010[2]
위치천문학
시선속도 (Rv)28.7[5] km/s
고유운동 (μ) RA: −103.51[1] mas/yr
Dec.: −39.48[1] mas/yr
연주 시차 (π)18.00 ± 0.21 mas[1]
거리181 ± 2 ly
(55.6 ± 0.6 pc)
절대등급 (MV)+1.1[6]
상세
질량2.18[7] M
반지름2.5[8] R
광도36[9] L
표면중력 (log g)4.17[7] cgs
유효온도9,108[9] K
투영 자전 속도 (v sin i)86±6[10] km/s
나이171[7] Myr
천체 명칭
Asellus Borealis, γ Cnc, Gamma Cnc, 43 Cnc, BD+21° 1895, FK5 1228, GC 11982, HD 74198, HIP 42806, HR 3449, SAO 80378, CCDM 08433+2128[11]
데이터베이스 자료
SIMBAD데이터

아셀루스 보레알리스(영어: Asellus Borealis, 영어 발음: /əˈsɛləs bɒriˈælɪs/)는 게자리의 감마별로, 태양으로부터 약 181광년 떨어진 곳에 위치해 있다. 별은 방사형 속도로 더 멀리 표류하고 있고, 초속 29km/s이다.

1910년에 이 별은 오제이 리에 의해 분광쌍성으로 보고되었지만 지금은 단일별로 간주된다.[12][13][14] 황도 근처에 있기 때문에 달에 의해 가려 질 수 있으며 매우 드물게 행성에 의해 가려질 수 있다.[15]

명명법

게자리 감마는 이 별을 바이어 명명법으로 표기 한 것이다. 전통적인 이름 아셀루스 보레알리스는 라틴어에서 "북부 당나귀"라는 뜻이다.[16] 아셀루스 보레알리스라는 이름은 2016년 11월 6일 국제천문연맹항성명칭 실무그룹에 의해 승인되었고 IAU가 승인한 별 이름 목록에 포함되었다.[17]

속성

아셀루스 보레알리스는 겉보기 등급 +4.67 의 백색 A형 준거성으로 나타난다. 이 별의 나이는 1억 7천 1백만 년으로 추정되며, 예상 회전 속도는 86km/s로 회전하고 있다. 질량은 태양의 2.18 배에 달하며 유효 온도 9108K에서 약 36배 더 높은 광도로 빛난다. 거리, 공간 이동 및 추정 연령을 기준으로 히아데스 스트림의 별로 포함되었다.[18]

각주

  1. van Leeuwen, F. (2007). “Validation of the New Hipparcos Reduction”. 《Astronomy and Astrophysics》 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. 
  2. 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. 
  3. Abt, Helmut A.; Morrell, Nidia I. (1995). “The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars”. 《Astrophysical Journal Supplement》 95: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. 
  4. Mermilliod, J.-C. (1986). “Compilation of Eggen's UBV data, transformed to UBV (unpublished)”. 《Catalogue of Eggen's UBV Data》. Bibcode:1986EgUBV........0M. 
  5. Wilson, Ralph Elmer (1953). “General catalogue of stellar radial velocities”. 《Carnegie Institute Washington D.C. Publication》. Bibcode:1953GCRV..C......0W. 
  6. Eggen, O. J.; Iben, Icko, Jr. (1988). “Starbursts, binary stars, and blue stragglers in local superclusters and groups. I - The very young disk and young disk populations”. 《Astronomical Journal》 96: 635–669. Bibcode:1988AJ.....96..635E. doi:10.1086/114834. 
  7. 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.  Vizier catalog entry
  8. Pasinetti Fracassini, L. E.; 외. (2001). “Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics”. 《Astronomy & Astrophysics》 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754. 
  9. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (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. 
  10. Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (2002). “Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i”. 《Astronomy and Astrophysics》 393: 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763. 
  11. “gam Cnc”. 《SIMBAD》. Centre de données astronomiques de Strasbourg. 2015년 4월 8일에 확인함. 
  12. Lee, Oliver J. (November 1910). “Measures on nineteen new spectroscopic binaries”. 《Astrophysical Journal》 32: 300–308. Bibcode:1910ApJ....32..300L. doi:10.1086/141806. 
  13. Eggleton, P. P.; Tokovinin, A. A. (September 2008). “A catalogue of multiplicity among bright stellar systems”. 《Monthly Notices of the Royal Astronomical Society389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976. 
  14. De Rosa, R. J.; 외. (July 2011). “The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars”. 《Monthly Notices of the Royal Astronomical Society》 415 (1): 854–866. arXiv:1103.4363. Bibcode:2011MNRAS.415..854D. doi:10.1111/j.1365-2966.2011.18765.x. S2CID 84181878. 
  15. Schmidtke, P. C.; Africano, J. L. (January 2011). “KPNO Lunar Occultation Summary. III”. 《The Astronomical Journal》 141 (1): 7. Bibcode:2011AJ....141...10S. doi:10.1088/0004-6256/141/1/10. S2CID 120313180. 10. 
  16. Dixon-Kennedy, Mike (1998), 《Encyclopedia of Greco-Roman Mythology》, ABC-CLIO, 51쪽, ISBN 9781576070949 
  17. Richard H. Allen (2013년 2월 28일). 《Star Names: Their Lore and Meaning》. Courier Corporation. ISBN 978-0-486-13766-7. 
  18. Eggen, Olin J. (October 1992). “The Hyades Supercluster in FK5”. 《Astronomical Journal》 104: 1482. Bibcode:1992AJ....104.1482E. doi:10.1086/116333. 

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