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{{Starbox begin
| name = ADS 9731
}}
{{Starbox observe
| epoch = [[J2000]]
| constell = [[北冕座]]
| ra = {{RA|15|38|12.91478}}<ref name=hipparcos2/>
| dec = {{DEC|+36|14|48.5597}}<ref name=hipparcos2/>
| appmag_v = 6.9 （全部）{{cn|date=February 2021}} 
}}
{{Starbox character
| class = F4V, F5V, G4V, F3V, F7V, M3V?<ref name=Tokovinin/> 
| appmag_1_passband = 
| appmag_1 = 
| appmag_2_passband = 
| appmag_2 = 
| appmag_3_passband = 
| appmag_3 = 
| appmag_4_passband = 
| appmag_4 = 
| appmag_5_passband = 
| appmag_5 = 
| appmag_6_passband = 
| appmag_6 = 
| appmag_7_passband = 
| appmag_7 = 
| appmag_8_passband = 
| appmag_8 = 
| r-i = 
| v-r = 
| b-v = 
| u-b = 
| j-h = 
| j-k = 
| variable = 
}}
{{Starbox astrometry
| component1 = A
| prop_mo_ra = 73.197<ref name=edr3a/>
| prop_mo_dec = −57.740<ref name=edr3a/>
| parallax = 9.0945
| p_error = 0.0175
| parallax_footnote = <ref name=edr3a/>
}}
{{Starbox astrometry|no_heading=y
| component1 = B
| prop_mo_ra = 71.824<ref name=edr3b/>
| prop_mo_dec = −54.140<ref name=edr3b/>
| parallax = 9.1101
| p_error = 0.0307
| parallax_footnote = <ref name=edr3b/>
}}
{{Starbox astrometry|no_heading=y
| component1 = C
| prop_mo_ra = 75.165<ref name=edr3c/>
| prop_mo_dec = −59.731<ref name=edr3c/>
| parallax = 9.0970
| p_error = 0.0199
| parallax_footnote = <ref name=edr3c/>
}}
{{Starbox astrometry|no_heading=y
| component1 = D
| prop_mo_ra = 72.818<ref name=edr3d/>
| prop_mo_dec = −58.281<ref name=edr3d/>
| parallax = 9.0870
| p_error = 0.0322
| parallax_footnote = <ref name=edr3d/>
}}
{{Starbox orbit
| reference = 
| primary = 
| name = 
| period = 
| period_unitless = 
| axis = 
| axis_unitless = 
| eccentricity = 
| inclination = 
| node = 
| periastron = 
| periarg = 
| periarg_primary = 
| k1 = 
| k2 = 
}}
{{Starbox catalog
| names = {{odlist | BD=+36°2626 | CCDM=J15382+3615AB | HD=139691 | WDS=J15382+3615AB }} 
}}
{{Starbox reference
| Simbad = HD+139691 
}}
{{Starbox end}}

'''ADS 9731'''是位於[[星座]][[北冕座]]，由六顆恆星組成的一個恆星系統。其中四顆恆星於1995年使用[[自适应光学|調適光學]]解析成功，在視覺上是分開的，形成了一個[[目視聯星|視恆星系統]]<ref name=Drummond/>。1998年，發現其餘兩顆在是[[聯興#光譜聯星|光譜聯星]]，導致系統中總共有六顆已知恆星<ref name=Tokovinin/>。它是為數不多的至少有六個成員的[[恆星系統#聚星系統|多恆星系統]]之一<ref name=Tokovinin/>。

<div style="float:left; width:240px; border:solid black 1px; text-align: center; margin: 8px; padding: 4px; font-size: 90%;">
{{chart/start}}
{{Tree chart|border=1| | | |, |S1| |S1='''Aa''' }}
{{Tree chart|border=0| | |, |( |PA| |PA=Period = 3.27 d }}
{{Tree chart|border=1| | |! |` |S2| |S2='''Ab''' }}
{{Tree chart|border=0| |, |( | |PB| |PB=Period = 450 y }}
{{Tree chart|border=1| |! |` |- |S3| |S3='''B''' }}
{{Tree chart|border=0| |( | | |PD| |PD=Period = 20,000 y }}
{{Tree chart|border=1| |! |, |- |S5| |S5='''C''' }}
{{Tree chart|border=0| |` |( | |PE| |PE=Period = 1000 y }}
{{Tree chart|border=1| | |! |, |S6| |S6='''Da''' }}
{{Tree chart|border=0| | |` |( |PE| |PE=Period = 14.28 d }}
{{Tree chart|border=1| | | |` |S6| |S6='''Db''' }}
{{chart/end}}
軌道層次
</div>
組成部分是這樣組織的：Aa和Ab是黃白色主序星，光譜類型分別為F4V和F5V，質量分別為1.35和1.32太陽質量，每3.27天互繞一周。這對又與恆星B在450年的軌道上互繞；恆星B的光譜類型為G4V，質量與太陽大致相同。恆星C是一顆黃白色恆星，光譜類型為F3V，質量約為太陽的1.41倍，剛剛開始變亮並偏離主序星。成員Da和Db是一對軌道週期14.28天的聯星，由光譜類型F7V的黃白主序星和一顆光譜類型M3V的紅矮星組成。C與Dab又組成軌道週期1,000年的聯星。最後，恆星C和Dab的系統，以及恆星Aab和B的系統，組成需要20,000多年的時間才能相互繞行軌道運行的巨星系統<ref name=Tokovinin/>。

來自整個系統的組合光產生集成的[[視星等]]為6.9等。已公佈的成員的[[視星等]]變化很大，因此有些肯定是錯誤<ref name=Tokovinin/>，但是成員A、B、 C、和D分別約為8、10、9和9等<ref name=wds/>。所有六個分量的模型顯示，Aa和Ab的星等分別為8.5和8.7等，而分量D的微弱伴星的星等約為16等。儘管分量A比分量C稍亮，但CD對比AB對稍亮<ref name=Tokovinin/>。

[[蓋亞目錄#蓋亞 EDR3|蓋亞 EDR3]]對四顆已解析恆星的視差進行了編目，所有恆星的距離都為{{convert|110|pc|ly|order=flip}}，統計誤差小於一秒差距。

該恆星系統被認為是直接成像蒐索系外行星的可能目標<ref name=Janson/>，但是在這個系統中還沒有發現行星。

== 參考資料 ==
{{Reflist|colwidth=25em|refs=

<ref name=edr3a>{{cite Gaia EDR3|1374656960860690560}}</ref>

<ref name=edr3b>{{cite Gaia EDR3|1374656960858806144}}</ref>

<ref name=edr3c>{{cite Gaia EDR3|1374656960858803072}}</ref>

<ref name=edr3d>{{cite Gaia EDR3|1374656960861310336}}</ref>

<ref name=wds>{{cite journal
| journal=[[The Astronomical Journal]]
| display-authors=1
| last1=Mason
| first1=B. D.
| last2=Wycoff
| first2=G. L.
| last3=Hartkopf
| first3=W. I.
| last4=Douglass
| first4=G. G.
| last5=Worley
| first5=C. E.
| title=The Washington Visual Double Star Catalog
| year=2014
| volume=122
| issue=6
| page=3466
| bibcode=2001AJ....122.3466M
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds
| access-date=2015-07-22
| doi=10.1086/323920
| doi-access=free
| archive-date=2019-07-04
| archive-url=https://web.archive.org/web/20190704005249/http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B%2Fwds
| dead-url=no
}}</ref>

<ref name=hipparcos2>
{{cite journal
|bibcode=2007A&A...474..653V
|doi = 10.1051/0004-6361:20078357
|title=Validation of the new Hipparcos reduction
|year=2007
|last1=Van Leeuwen
|first1=F.
|journal=[[Astronomy and Astrophysics]]
|volume=474
|issue=2
|pages=653–664 |arxiv = 0708.1752 |s2cid = 18759600
}}</ref>

<ref name=Tokovinin>
{{cite journal
|bibcode=1998AstL...24..795T
|title=ADS 9731: A new sextuple system
|last1=Tokovinin
|first1=A. A.
|last2=Shatskii
|first2=N. I.
|last3=Magnitskii
|first3=A. K.
|volume=24
|year=1998
|pages=795
|journal=[[Astronomy Letters]]
|issue=6
}}</ref>

<ref name=Janson>
{{cite journal
|bibcode=2010MNRAS.408..514J
|title=The relevance of prior inclination determination for direct imaging of Earth-like planets
|last1=Janson
|first1=M.
|volume=408
|year=2010
|pages=514–521
|journal=[[Monthly Notices of the Royal Astronomical Society]]
|issue=1
|doi=10.1111/j.1365-2966.2010.17135.x
|arxiv = 1006.2941 |s2cid=118380508
}}</ref>

<ref name=Drummond>
{{cite journal
|bibcode=1995ApJ...450..380D
|title=Full Adaptive Optics Images of ADS 9731 and MU Cassiopeiae: Orbits and Masses
|url=https://archive.org/details/sim_astrophysical-journal_1995-09-01_450_1/page/380
|last1=Drummond
|first1=Jack D.
|last2=Christou
|first2=Julian C.
|last3=Fugate
|first3=Robert Q.
|volume=450
|year=1995
|pages=380
|journal=[[Astrophysical Journal]]
|doi=10.1086/176148
}}</ref>

}}

{{北冕座}}

{{DEFAULTSORT:ADS 9731}}
[[Category:F型主序星]]
[[Category:G型主序星]]
[[Category:紅矮星]]
[[Category:多星系統|6]]
[[Category:北冕座]]
[[Category:BD、CD和CP天體]]
[[Category:HD和HDE天體|139691]]
[[Category:HIP天體|076563]]

ADS 9731 - 版本历史

imported>InternetArchiveBot：​Add 1 book for verifiability (20251017sim)) #IABot (v2.0.9.5) (GreenC bot

imported>InternetArchiveBot：Add 1 book for verifiability (20251017sim)) #IABot (v2.0.9.5) (GreenC bot