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{{Starbox begin
| name = IRAS 19475+3119
}}
{{Starbox image
| image = [[File:IRAS 19475+3119.jpg|250px]]
| caption = IRAS 19474+3119
}}
{{Starbox observe
| constell = [[天鵝座]]
| epoch = [[J2000]]
| ra = {{RA|19|49|29.5627}}<ref name=tycho/>
| dec = {{Dec|+31|27|16.221}}<ref name=tycho/>
| appmag_v = 9.52<ref name=tycho2/> {{nowrap|(9.33 - 9.50<ref name=gcvs/>)}}
}}
{{Starbox character
| type = [[原行星雲]]
| class = F3 Ibe<ref name=klochkova/>
| variable = [[半規則變星|SRd]]<ref name=gcvs/>
}}
{{Starbox astrometry
| prop_mo_ra = -0.6<ref name=tycho2/>
| prop_mo_dec = -2.8<ref name=tycho2/>
| dist_pc = 4,900<ref name=ming/>
}}
{{Starbox detail
| source =
| mass = 0.63<ref name=ming/>
| radius = 58<ref name=ming/>
| luminosity = 8,300<ref name=ming/>
| temperature = 7,200<ref name=klochkova/>
| metal_fe = −0.25<ref name=klochkova/>
| gravity = 0.5<ref name=ming/>
}}
{{Starbox catalog
|names = {{odlist|V=V2513 Cyg|HD=331319|BD=+31° 3797}}
}}
{{Starbox reference
| Simbad = V2513+Cyg
}}
{{Starbox end}}

'''IRAS 19475+3119'''是一個距離地球約15000光年的[[原行星雲]]，在天球上位於[[天鵝座]]。中心恆星'''天鵝座V2513'''（'''V2513 Cygni'''）是[[恆星光譜|F型]]後[[漸近巨星分支]]恆星。

== 概要 ==
IRAS 19475+3119最明亮的部分是四極結構，包含了細長的雙極葉狀結構，並且都被一個微弱的暈所包圍<ref Name=quad/>。

該星雲的實際距離目前未知，天文學家以假設的光度估計距離等其他恆星參數。如果假設運動距離為4900秒差距，則星雲整體光度為{{solar luminosity|8,300}}，半徑為{{solar radius|58}}<ref name=ming/>。中心恆星的原始質量估計至少{{solar mass|2.5}}，現在則是{{solar mass|0.63}}<ref name=quad/>。如果假設星雲整體光度{{solar luminosity|3,500}}，其與地球的距離則為1500秒差距<ref name=vickers/>。基於氧[[譜線]]觀測資料的光度估計值則遠高出前述的值，並且[[絕對星等]]至少-8<ref name=klochkova/>。

星雲中心的恆星是一顆[[視星等]]在9.33至9.50之間變化的[[變星]]。該恆星的41日主要光變周期已經確認，但另一個稍短的次要周期導致的較長[[拍频]]使光變幅度和周期每年都在變化。這些變化是由{{link-en|恆星脈動|Stellar pulsation}}造成，並且恆星表面溫度最高時最明亮，表面[[有效溫度]]變化最高可達到400 K<ref name=hrivnak/>。

== 參考資料 ==
{{reflist|refs=

<ref name=vickers>{{cite journal|bibcode= 2015MNRAS.447.1673V|arxiv=1403.7230|title=New light on Galactic post-asymptotic giant branch stars - I. First distance catalogue|journal=Monthly Notices of the Royal Astronomical Society|volume=447|issue=2|pages=1673|author1=Vickers|first1=Shane B.|last2=Frew|first2=David J.|last3=Parker|first3=Quentin A.|last4=Bojičić|first4=Ivan S.|year=2015|doi=10.1093/mnras/stu2383}}</ref>

<ref name=ming>{{cite journal|bibcode=2011ApJ...736...30H|arxiv=1105.2410|title=An Envelope Disrupted by a Quadrupolar Outflow in the Pre-planetary Nebula IRAS 19475+3119|journal=The Astrophysical Journal|volume=736|pages=30|author1=Hsu|first1=Ming-Chien|last2=Lee|first2=Chin-Fei|year=2011|doi=10.1088/0004-637X/736/1/30}}</ref>

<ref name=quad>{{cite journal|bibcode=2007ApJ...658..410S|title=A Quadrupolar Preplanetary Nebula: IRAS 19475+3119|url=https://archive.org/details/sim_astrophysical-journal_2007-03-20_658_1/page/410|journal=The Astrophysical Journal|volume=658|pages=410|author1=Sahai|first1=Raghvendra|last2=Sánchez Contreras|first2=Carmen|last3=Morris|first3=Mark|last4=Claussen|first4=Mark|year=2007|doi=10.1086/511294}}</ref>

<ref name=tycho>{{cite journal|bibcode=1998A&A...335L..65H|title=The TYCHO Reference Catalogue|journal=Astronomy and Astrophysics|volume=335|pages=L65|author1=Hog|first1=E.|last2=Kuzmin|first2=A.|last3=Bastian|first3=U.|last4=Fabricius|first4=C.|last5=Kuimov|first5=K.|last6=Lindegren|first6=L.|last7=Makarov|first7=V. V.|last8=Roeser|first8=S.|year=1998}}</ref>

<ref name=tycho2>{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|author1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|year=2000|doi=10.1888/0333750888/2862}}</ref>

<ref name=klochkova>{{cite journal|bibcode=2002AstL...28...49K|title=HD 331319: A Post-AGB F Supergiant with He I Lines|journal=Astronomy Letters|volume=28|pages=49|author1=Klochkova|first1=V. G.|last2=Panchuk|first2=V. E.|last3=Tavolzhanskaya|first3=N. S.|year=2002|doi=10.1134/1.1434453}}</ref>

<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>

<ref name=hrivnak>{{cite journal|bibcode=2015AJ....149..184H|title=Variability in Proto-planetary Nebulae. IV. Light Curve Analysis of Four Oxygen-rich, F Spectral Type Objects|journal=The Astronomical Journal|volume=149|issue=6|pages=184|author1=Hrivnak|first1=Bruce J.|last2=Lu|first2=Wenxian|last3=Nault|first3=Kristie A.|year=2015|doi=10.1088/0004-6256/149/6/184|arxiv = 1503.09120 }}</ref>

}}

{{Stars of Cygnus}}

[[Category:F型超巨星]]
[[Category:AGB恆星]]
[[Category:天鵝座]]
[[Category:原行星雲]]
[[Category:以变星命名法命名的天体|Cygni, V2513]]
[[Category:BD、CD和CP天体]]
[[Category:HD和HDE天體|331319]]
[[Category:IRAS天體|19475]]
[[Category:半規則變星]]

IRAS 19475 + 3119 - 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