NML Cygni၏ ရင်းမြစ်ကို ကြည့်ရန်

{{Sky|20|46|25.54|+|40|06|59.40}}
{{Retaining title}}
{{Starbox begin
| name = NML&nbsp;Cygni
}}
{{Starbox image
 | image= [[Image:NML Cygni SDSS DR9.jpg|256px]]
|caption= NML Cygni, seen as the deep red star at the center, from the [[:en:Sloan Digital Sky Survey]] DR9. Note the green circumstellar nebula surrounding the star.
}}
{{Starbox observe
| epoch    = [[J2000.0]]
| equinox  = [[J2000.0]]
| constell = [[ဆိုင်နပ် (ကြယ်စုတန်း)|ဆိုင်နပ်]]
| ra       = {{RA|20|46|25.54}}<ref name=2mass>{{cite journal|bibcode=2003yCat.2246....0C|title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)|journal=VizieR On-line Data Catalog: II/246. Originally Published in: 2003yCat.2246....0C|volume=2246|pages=II/246|last1=Cutri|first1=R. M.|last2=Skrutskie|first2=M. F.|last3=Van Dyk|first3=S.|last4=Beichman|first4=C. A.|last5=Carpenter|first5=J. M.|last6=Chester|first6=T.|last7=Cambresy|first7=L.|last8=Evans|first8=T.|last9=Fowler|first9=J.|last10=Gizis|first10=J.|last11=Howard|first11=E.|last12=Huchra|first12=J.|last13=Jarrett|first13=T.|last14=Kopan|first14=E. L.|last15=Kirkpatrick|first15=J. D.|last16=Light|first16=R. M.|last17=Marsh|first17=K. A.|last18=McCallon|first18=H.|last19=Schneider|first19=S.|last20=Stiening|first20=R.|last21=Sykes|first21=M.|last22=Weinberg|first22=M.|last23=Wheaton|first23=W. A.|last24=Wheelock|first24=S.|last25=Zacarias|first25=N.|year=2003}}</ref>
| dec      = {{DEC|+40|06|59.4}}<ref name=2mass/>
| appmag_v = 16.60 (variable)<ref name=johnson>{{cite journal|bibcode=1965ApJ...142.1249J|title=Observations of "Infrared Stars."|journal=Astrophysical Journal|volume=142|pages=1249|last1=Johnson|first1=Harold L.|last2=Mendoza v.|first2=Eugenio E.|last3=Wisniewski|first3=Weislaw Z.|year=1965|doi=10.1086/148393}}</ref>
| pronounce =
}}
{{Starbox character
| type = [[:en:OH/IR star|OH/IR]]<ref name=michael/> red hypergiant<ref name=zhang/>
| class = M4.5–M7.9 Ia–III
| b-v = +2.04<ref name=johnson/>
| appmag_1_passband = K
| appmag_1 = 12.3<ref name=debeck/>
| appmag_2_passband = B
| appmag_2 = 18.64
| appmag_3_passband = V
| appmag_3 = 16.60
| appmag_4_passband = G
| appmag_4 = 11.0330
| appmag_5_passband = J
| appmag_5 = 4.877
| appmag_6_passband = H
| appmag_6 = 2.389
| variable = [[:en:Semiregular variable star|SRc]]<ref name=debeck/>
}}
{{Starbox astrometry
| radial_v =
| prop_mo_ra = −1.55<ref name=zhang/>
| prop_mo_dec = −4.59<ref name=zhang/>
| parallax = 0.620
| p_error  = 0.047
| parallax_footnote = <ref name=zhang/>
| dist_pc  = {{val|1,610|130|110|fmt=commas}}<ref name=zhang/>
| dist_ly  = {{val|5,250|420|360|fmt=commas}}
}}
{{Starbox detail
| source                 =
| temperature            = 3,300<ref name=michael>{{cite journal|doi=10.3847/1538-3881/aab961|title=Searching for Cool Dust. II. Infrared Imaging of the OH/IR Supergiants, NML Cyg, VX SGR, S Per, and the Normal Red Supergiants RS per and T per|year=2018|last1=Gordon|first1=Michael S.|last2=Humphreys|first2=Roberta M.|last3=Jones|first3=Terry J.|last4=Shenoy|first4=Dinesh|last5=Gehrz|first5=Robert D.|last6=Helton|first6=L. Andrew|last7=Marengo|first7=Massimo|last8=Hinz|first8=Philip M.|last9=Hoffmann|first9=William F.|s2cid=73650032|journal=The Astronomical Journal|volume=155|issue=5|page=212|arxiv=1708.00018|bibcode=2018AJ....155..212G}}</ref>
| mass                   = 50<ref name=mass>{{cite journal|bibcode=1983ApJ...267..179M|title=The nature of NML Cygnus|journal=Astrophysical Journal|volume=267|pages=179|last1=Morris|first1=M.|last2=Jura|first2=M.|year=1983|doi=10.1086/160856}}</ref>
| radius                 = {{nowrap|either 1,639 or 2,770<ref name=zhang/>{{efn|name=radius}}}}, 1,183<ref name=debeck>{{cite journal|bibcode=2010A&A...523A..18D|arxiv=1008.1083|title=Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: Derivation of mass-loss rate formulae|journal=Astronomy and Astrophysics|volume=523|pages=A18|last1=De Beck|first1=E.|last2=Decin|first2=L.|last3=De Koter|first3=A.|last4=Justtanont|first4=K.|last5=Verhoelst|first5=T.|last6=Kemper|first6=F.|last7=Menten|first7=K. M.|s2cid=16131273|year=2010|doi=10.1051/0004-6361/200913771}}</ref>
| luminosity             = {{val|229,000|40,000|41,000|fmt=commas}}<ref name=Davies2020>{{Cite journal|last1=Davies|first1=Ben|last2=Beasor|first2=Emma R.|s2cid=210714093|date=March 2020|title=The 'red supergiant problem': the upper luminosity boundary of Type II supernova progenitors|bibcode=2020MNRAS.493..468D|journal=[[MNRAS]]|language=en|volume=493|issue=1|pages=468–476|doi=10.1093/mnras/staa174|arxiv=2001.06020 }}</ref>
| age_myr                = 8<ref name=zhang/>
}}
{{Starbox catalog
| names    = NML&nbsp;Cyg, [[Variable star designation|V1489]]&nbsp;Cyg, [[RAFGL]]&nbsp;2650, [[Two-Micron Sky Survey|IRC]]&nbsp;+40448, [[2MASS]]&nbsp;J20462554+4006594, [[AAVSO]]&nbsp;2042+39
}}
{{Starbox reference
| Simbad = NML+Cyg
}}
{{Starbox end}}
'''NML Cygni''' သို့မဟုတ် '''V1489 Cygni''' (အတိုကောက် NML Cyg သို့မဟုတ် V1489 Cyg) သည် [[ဆိုင်နပ် (ကြယ်စုတန်း)|ဆိုင်နပ်]] [[ကြယ်စုတန်း]]မှ ဟိုက်ပါဂျိုင်းယင့် ကြယ်နီကြီး<ref name="zhang">{{Cite journal | last1 = Zhang | first1 = B. | last2 = Reid | first2 = M. J. | last3 = Menten | first3 = K. M. | last4 = Zheng | first4 = X. W. | last5 = Brunthaler | first5 = A. | s2cid = 55509287 | year = 2012 | title = The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry | journal = Astronomy & Astrophysics | volume = 544 | pages = A42 | arxiv = 1207.1850| bibcode = 2012A&A...544A..42Z| doi = 10.1051/0004-6361/201219587  | url = http://www.aanda.org/articles/aa/pdf/2012/08/aa19587-12.pdf }}</ref> (red hypergiant) သို့မဟုတ် ဆူပါဂျိုင်းယင့် ကြည်နီကြီး (red supergiant) တစ်ခုဖြစ်သည်။ ယင်းသည် လက်ရှိတွင် [[နဂါးငွေ့တန်း ဂလက်ဆီ]]ရှိ အတောက်ပဆုံးကြယ်များထဲမှတစ်ခု၊ အချင်းဝက်အကြီးဆုံးကြယ်များထဲမှတစ်ခု၊ အတောက်ပဆုံး ဟိုက်ပါဂျိုင်းယင့်ကြယ်များထဲမှတစ်ခု ဖြစ်သည်။ ယင်းသည် [[ကမ္ဘာမြေ]]မှ ခန့်မှန်းခြေ [[အလင်းနှစ်]] ၅၃၀၀ ကွာဝေးသည်။<ref name="Schuster2007">{{cite book|first=Michael Thomas|last=Schuster|title=Investigating the Circumstellar Environments of the Cool Hypergiants|url={{google books|id=EA3cyIPFvU8C|page=57|plainurl=yes}}|access-date=27 August 2012|date=2007|isbn=978-0-549-32782-0|page=57}}{{Dead link|date=January 2023 }}</ref> NML Cygni ၏ အချင်းဝက်မှာ မသေချာပေ။ သို့သော် နေ၏အချင်းဝက်ထက် အဆပေါင်း ၁၁၈၃ မှ ၂၇၇၀ ကြားရှိသည်ဟု ခန့်မှန်းရသည်။ ယင်းအား [[နေအဖွဲ့အစည်း]]၏ အလယ်ဗဟိုတွင် ထားလိုက်ပါက မျက်နှာပြင်သည် [[ဂျူပီတာဂြိုဟ်]] သို့မဟုတ် [[စနေဂြိုဟ်]]၏ ပတ်လမ်းအထိ ထိုးထွက်နေမည်ဖြစ်သည်။ 

==မှတ်စု==
{{notelist|refs=

{{efn | name=radius | Applying the [[:en:Stefan-Boltzmann Law]] with a nominal [[နေ|solar]] [[:en:effective temperature]] of 5,772&nbsp;[[:en:Kelvin|K]]:
:<math>\sqrt{(5772/3250)^4 * 270,000} = 1638.96\ R\odot</math>
:<math>\sqrt{(5772/2500)^4 * 270,000} = 2769.84\ R\odot</math>}}

}}

==ကိုးကား==
{{Reflist}}


[[Category:ဆိုင်နပ် (ကြယ်စုတန်း)]]
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