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词条 Omega Draconis
释义

  1. Naming

  2. References

{{Starbox begin
|name=Omega Draconis}}{{Starbox observe
|constell=Draco
|epoch=J2000
|ra={{RA|17|36|57.09403}}[1]
|dec={{DEC|+68|45|28.6961}}[1]
|appmag_v=4.80[2]
}}{{Starbox character
|class=F5V[3]
|b-v=+0.43[2]
|u-b=−0.01[2]
}}{{Starbox astrometry
|radial_v=−13.98 ± 0.02[4]
|prop_mo_ra=2.58[1]
|prop_mo_dec=321.73[1]
|parallax=43.17
|p_error=0.17
|parallax_footnote=[1]
|absmag_v=2.95[5]
}}{{Starbox orbit
|reference=[12]
|period_unitless=5.2797766 ± 0.0000044 d
|axis_unitless=3.469 ± 0.017 mas
|inclination=151.4 ± 1.1
|node=1.23 ± 0.32
|eccentricity=0.00220 ± 0.00031
|periarg=314.8 ± 5.6
|periastron=JD 2454349.083 ± 0.083
|k1=36.254 ± 0.016
|k2=44.720 ± 0.016
}}{{Starbox detail
|component1=ω Dra A
|mass=1.46 ± 0.16
|luminosity=5.61[5]
|temperature=6,500
|metal_fe={{Val|0.18|0.05}}[5]
|age_gyr=1.9[5]
|component2=ω Dra B
|mass2=1.18 ± 0.13
|temperature2=5900
|metal_fe2=0.0
}}{{Starbox catalog
|names=ω Dra, 28 Dra, BD+68° 949, GJ 4017, HD 160922, HIP 86201, HR 6596, SAO 17576
}}{{Starbox reference
|Simbad=*+ome+Dra
}}{{Starbox end}}Omega Draconis, Latinized from ω Draconis and also known as 28 Draconis, is a binary star in the constellation of Draco. The system is fairly close, and is located about 76 light-years (23 parsecs) away, based on its parallax.[1]

Omega Draconis is a spectroscopic binary, which means the two stellar components are too close to be resolved but periodic Doppler shifts in their spectra indicate orbital motion. In this case, light from both stars can be detected, and it is a double-lined spectroscopic binary. The orbital period of the system is 5.28 days, and the eccentricity of the system is 0.00220, implying a nearly circular orbit. The primary has a mass of {{solar mass|1.46|link=yes}}, and is an F-type main-sequence star. The secondary is less massive, at {{solar mass|1.18}}.[6]

Naming

  • With 27 Draconis, it composed the Arabs' Al Aṭhfār al Dhīb, the Hyaena's claws.[7] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Aṭhfār al Dhīb were the title for two stars : this star (ω) as Adfar Aldib I and 27 Draconis as Adfar Aldib II[8].
  • In Chinese, {{lang|zh|尚書}} ({{lang|zh-Latn|Shàng Shū}}), meaning Royal Secretary, refers to an asterism consisting of ω Draconis, 15 Draconis, 18 Draconis and 19 Draconis[9]. Consequently, ω Draconis itself is known as {{lang|zh|尚書一}} ({{lang|zh-Latn|Shàng Shū yī}}, {{lang-en|the First Star of Royal Secretary}}.).[10]

References

1. ^1 2 3 4 5 {{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author1=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}}
2. ^1 2 {{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}}
3. ^{{cite journal|doi=10.1086/107457|title=Distribution of the nearer bright stars in the color-luminosity array|journal=The Astronomical Journal|volume=62|pages=45|year=1957|last1=Eggen|first1=O.|bibcode = 1957AJ.....62...45E }}
4. ^{{cite journal|title=SB9: The ninth catalogue of spectroscopic binary orbits|display-authors=1|author1=Pourbaix, D.|author2=Tokovinin, A. A.|author3=Batten, A. H.|author4=Fekel, F. C.|author5=Hartkopf, W. I.|author6=Levato, H.|author7=Morrell, N. I.|author8=Torres, G.|author9=Udry, S.|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727–732|year=2004|doi=10.1051/0004-6361:20041213|arxiv=astro-ph/0406573|bibcode=2004A&A...424..727P}}
5. ^1 2 3 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
6. ^1 {{cite journal | title=High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027 | url=http://iopscience.iop.org/0004-637X/719/2/1293/fulltext/ | last1=Konacki | first1=Maciej | last2=Muterspaugh | first2=Matthew W. | last3=Kulkarni | first3=Shrinivas R. | last4=Hełminiak | first4=Krzysztof G. | display-authors=1 | journal=The Astrophysical Journal | volume=719 | issue=2 | pages=1293–1314 | year=2010 | arxiv=0910.4482 | bibcode=2010ApJ...719.1293K | doi=10.1088/0004-637X/719/2/1293 }}
7. ^{{citation | title=Star-Names and Their Meanings | last=Allen | first=Richard Hinckley | authorlink=Richard Hinckley Allen | date=1899 | publisher=G. E. Stechert | location=New York | page=212 }}
8. ^{{citation | url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf | first1=Jack W. | last1=Rhoads | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars | publisher=Jet Propulsion Laboratory, California Institute of Technology | date=November 15, 1971 | postscript=. }}
9. ^Ian Ridpath's Startales - Drco the Dragon
10. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 10 日
{{Stars of Draco}}

10 : Draco (constellation)|F-type main-sequence stars|Bayer objects|Spectroscopic binaries|Hipparcos objects|Flamsteed objects|Henry Draper Catalogue objects|HR objects|Durchmusterung objects|Gliese and GJ objects
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