| 释义 |
- Description
- See also
- References
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{{Starbox begin
| name=χ Draconis
}}{{Starbox image
| image={{Location mark
|image=Draco constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=χ Draconis
|x=320|y=498
}}
|caption=Location of χ Draconis (circled)
}}{{Starbox observe
| epoch=J2000
| ra={{RA|18|21|03.38255}}
| dec={{DEC|+72|43|58.2518}}
| appmag_v=3.570[3] (3.68 / 5.67)
| constell=Draco
}}{{Starbox character
| class=F7V[4] / K0V
| b-v=0.49
| u-b=-0.06
| variable=Suspected
}}{{Starbox astrometry
| radial_v=+32.4[3]
| prop_mo_ra=531.21
| prop_mo_dec=-349.71
| parallax=124.11
| p_error=0.87
| parallax_footnote=
| absmag_v=4.04[3]
}}{{Starbox orbit
| reference=[10]
| name=Chi Draconis B
| period={{nowrap|0.7680599 ± 0.000061}}
| axis={{nowrap|0.1244 ± 0.0011}}
| eccentricity={{nowrap|0.428 ± 0.012}}
| inclination={{nowrap|74.42 ± 0.58}}
| node={{nowrap|230.30 ± 0.51}}
| periarg={{nowrap|119.3 ± 1.1}}
| periastron={{nowrap|1984.8324 ± 0.0026}}
}}{{Starbox detail
| component1=χ Dra A
| mass={{nowrap|1.029 ± 0.026}}[11]
| radius={{nowrap|1.20 ± 0.09}}[11]
| luminosity=1.86[11]
| temperature={{nowrap|6,150 ± 150}}[11]
| metal_fe=−0.41[3]
| rotational_velocity=11[16]
| age_gyr=5.3[3]
| component2=χ Dra B
| mass2={{nowrap|0.748 ± 0.017}}[11]
| radius2={{nowrap|0.73 ± 0.11}}[11]
| temperature2={{nowrap|4,940 ± 200}}[11]
| luminosity2=0.29[11]
}}{{Starbox catalog
| names=χ Dra, 44 Dra, BD+72° 839, FK5 695, Gl 713, HD 170153, HIP 89937, HR 6927, LHS 3379, LTT 15438, SAO 9087.[4]
}}{{Starbox reference
|Simbad=chi+Dra
}}{{Starbox end}}Chi Draconis (χ Dra, χ Draconis, Chi Draconis) is a star system in the constellation Draco. DescriptionThe first companion is a yellow-white (class F) fourth-magnitude star with a mass approximately equal to that of the sun, but it is nearly twice as luminous. The second companion is an orange (class K) sixth-magnitude star, that is less massive and of lesser luminosity than the sun. In 1898 this system was reported to be a spectroscopic binary system, with an orbital period of 280.55 days. The two stars have an average separation of nearly an astronomical unit, which would disrupt the orbit of any Earth-like planet that was close enough to the primary to support liquid water. The two stars have less than half the abundance of heavy elements as the Sun and are approximately a billion years older.[3] See also- Chi Draconis in fiction
- List of star systems within 25–30 light-years
References1. ^1 2 {{citation | title=chi Dra -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=chi+Dra | accessdate=2011-10-15 }}
2. ^1 2 3 4 5 6 {{citation | title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs | display-authors=1 | last1=Nordström | first1=B. | last2=Mayor | first2=M. | last3=Andersen | first3=J. | last4=Holmberg | first4=J. | last5=Pont | first5=F. | last6=Jørgensen | first6=B. R. | last7=Olsen | first7=E. H. | last8=Udry | first8=S. | last9=Mowlavi | first9=N. | journal=Astronomy and Astrophysics | volume=418 | pages=989–1019 |date=May 2004 | doi=10.1051/0004-6361:20035959 | bibcode=2004A&A...418..989N |arxiv = astro-ph/0405198 }}
3. ^1 {{Cite journal |first=D. N. |last=Monin |first2=S. N. |last2=Fabrika |first3=G. G. |last3=Valyavin |year=2002 |title=Magnetic survey of bright northern main sequence stars |journal=Astronomy & Astrophysics |volume=396 |issue=1 |pages=131–141 |doi=10.1051/0004-6361:20021425 |bibcode=2002A&A...396..131M}}
4. ^1 {{citation | display-authors=1 | last1=Farrington | first1=C. D. | last2=ten Brummelaar | first2=T. A. | last3=Mason | first3=B. D. | last4=Hartkopf | first4=W. I. | last5=Alister | first5=H. A. | last6=Raghavan | first6=D. | last7=Turner | first7=N. H. | last8=Sturmann | first8=L. | last9=Sturmann | first9=J. | title=Separated Fringe Packet Observations with the CHARA Array. I. Methods and New Orbits for χ Draconis, HD 184467, and HD 198084 | journal=The Astronomical Journal | volume=139 | issue=6 | pages=2308–2318 |date=June 2010 | doi=10.1088/0004-6256/139/6/2308 | bibcode=2010AJ....139.2308F }}
5. ^1 2 3 4 5 6 7 8 {{citation | last1=Torres | first1=G. | last2=Andersen | first2=J. | last3=Giménez | first3=A. | title=Accurate masses and radii of normal stars: modern results and applications | journal=The Astronomy and Astrophysics Review | volume=18 | issue=1-2 | pages=67–126 | doi=10.1007/s00159-009-0025-1 | bibcode=2010A&ARv..18...67T |arxiv = 0908.2624 }} See p. 56, entry #15.
}}External links- [https://web.archive.org/web/20051024072413/http://www.ari.uni-heidelberg.de/aricns/cnspages/4c01485.htm ARICNS]
- Chi Draconis 2 at SolStation.
- [https://web.archive.org/web/20050928213551/http://nstars.arc.nasa.gov/searches/starinfo.cfm?partb=1821p7243&starpage=0 nStars database entry]
{{Stars of Draco}} 12 : Draco (constellation)|Binary stars|Bayer objects|F-type main-sequence stars|K-type main-sequence stars|Solar-type stars|Hipparcos objects|Flamsteed objects|HR objects|Henry Draper Catalogue objects|Durchmusterung objects|Gliese and GJ objects |