VV Cephei: Perbedaan antara revisi
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(21 revisi perantara oleh 6 pengguna tidak ditampilkan) | |||
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{{distinguish|W Cephei}} |
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[[Berkas:Cepheus_constellation_crop_VV_Cephei_location.png|jmpl|Lokasi VV Cephei yang terletak di Rasi Bintang Cepheus.]] |
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{{short description|Sistem Bintang biner di Konstelasi Cepheus}} |
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[[Berkas:Sun_and_VV_Cephei_A.png|jmpl|Perbandingan besar Matahari dengan VV Cephei A.]] |
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{{Starbox begin |
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'''VV Cephei''', juga dikenal sebagai '''HD 208816''', adalah sistem bintang biner yang terletak di Rasi Bintang [[Cepheus]], berjarak sekitar 5000 tahun cahaya dari Bumi. |
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| name=VV Cephei |
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}} |
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{{Starbox image |
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| image=[[Berkas:Cepheus constellation crop VV Cephei location.png|center|260px]] |
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| caption=Lokasi VV Cephei di [[Konstelasi Cepheus]] (dilingkari merah) |
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| credit= |
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}} |
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{{starbox observe |
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| epoch=J2000 |
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| ra={{RA|21|56|39.14385}}<ref name=hipparcos>{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }}</ref> |
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| dec={{DEC|+63|37|32.0174}}<ref name=hipparcos/> |
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| appmag_v=4.91<ref name=hopkins2015/> {{nowrap|(4.80 - 5.36<ref name=gcvs/>)}} |
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| constell=[[Cepheus (constellation)|Cepheus]] |
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}} |
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{{Starbox character |
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|b-v=+1.73<ref name=gracyk/> |
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|u-b=+0.43<ref name=gracyk/> |
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|variable=[[Algol variable|EA]] + [[Semiregular variable star|SRc]]<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> |
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}} |
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{{Starbox character|no_heading=y |
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| component = A |
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| class=M2 Iab<ref name=hopkins2015>{{cite journal|bibcode=2015SASS...34...83H|title=VV Cephei Eclipse Campaign 2017/19|journal=The Society for Astronomical Sciences 34th Annual Symposium on Telescope Science. Published by Society for Astronomical Sciences|volume=34|pages=83|author1=Hopkins|first1=Jeffrey L.|last2=Bennett|first2=Philip D.|last3=Pollmann|first3=Ernst|year=2015}}</ref> |
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|b-v=+1.82<ref name=gracyk>{{cite journal|bibcode=1999IBVS.4679....1G|title=The Sudden Period Change of VV Cephei|journal=Information Bulletin on Variable Stars|volume=4679|pages=1|author1=Graczyk|first1=D.|last2=Mikolajewski|first2=M.|last3=Janowski|first3=J. L.|year=1999}}</ref> |
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|u-b=+2.07<ref name=gracyk/> |
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}} |
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{{Starbox character|no_heading=y |
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| component = B |
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| class=B0-2 V<ref name=hopkins2015/> |
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|b-v=+0.36<ref name=gracyk/> |
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|u-b=−0.52<ref name=gracyk/> |
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}} |
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{{Starbox astrometry |
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| parallax=1.33 |
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| p_error=0.20 |
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| parallax_footnote=<ref name=hipparcos/> |
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| dist_ly=4.9k |
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| dist_pc=1.5k<ref name=Bauer2007> |
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{{cite journal |
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|last1=Bauer |first1=W. H. |
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|last2=Bennett |first2=P. D. |
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|last3=Brown |first3=A. |
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|year=2007 |
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|title=An Ultraviolet Spectral Atlas of VV Cephei during Total Eclipse |
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|journal=[[Astrophysical Journal Supplement Series]] |
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|volume=171 |issue=1 |pages=249–259 |
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|bibcode=2007ApJS..171..249B |
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|doi=10.1086/514334 |
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|doi-access=free |
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}}</ref> |
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| absmag_v=−6.93<ref name=ginestet>{{cite journal|bibcode= 2002ApJS..143..513G|title= Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components|journal= The Astrophysical Journal Supplement Series|volume= 143|issue= 2|pages= 513|author1= Ginestet|first1= N.|last2= Carquillat|first2= J. M.|year= 2002|doi= 10.1086/342942|doi-access= free}}</ref> |
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}} |
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{{Starbox orbit |
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| reference = |
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| period_unitless = 7,430.5 days<ref name=wright/> |
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| inclination = 84<ref name=bauer2008/> |
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| eccentricity = 0.346 ± 0.01<ref name=wright/> |
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| axis = 16.2 ± 3.7<ref name=hopkins2015/> |
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| axis_unitless = 24.8<ref name=bennett/> AU |
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| k1 = 19.43 ± 0.33<ref name=wright/> |
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| k2 = 19.14 ± 0.68<ref name=wright/> |
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}} |
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{{starbox detail |
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| component1 = A |
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| radius=1,050<ref name=bauer2008>{{Cite journal | last1 = Bauer | first1 = W. H. | last2 = Gull | first2 = T. R. | last3 = Bennett | first3 = P. D. | doi = 10.1088/0004-6256/136/3/1312 | title = Spatial Extension in the Ultraviolet Spectrum of Vv Cephei | journal = The Astronomical Journal | volume = 136 | issue = 3 | pages = 1312 | year = 2008 | pmid = | pmc = |bibcode = 2008AJ....136.1312H }}</ref> |
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| mass=2.5<ref name="late"/> or 18.2<ref name=bennett/> |
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| luminosity=200,000<ref name=bennett2015/> |
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| temperature=3,826<ref name=hopkins2015/> |
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| gravity=0.0<ref name=carr/> |
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| metal_fe=−0.06<ref name=carr/> |
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| component2 = B |
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| mass2=8<ref name="late"/> or 18.6<ref name=bennett/> |
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| luminosity2= |
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| temperature2= |
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| radius2=13<ref name=wright/>-25<ref name=hack>{{cite journal|bibcode=1992A&AS...95..589H|title=Spectroscopic study of the atmospheric eclipsing binary VV Cephei|journal=Astronomy and Astrophysics Supplement Series|volume=95|pages=589|author1=Hack|first1=M.|last2=Engin|first2=S.|last3=Yilmaz|first3=N.|last4=Sedmak|first4=G.|last5=Rusconi|first5=L.|last6=Boehm|first6=C.|year=1992}}</ref> |
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| metal2=−0.14<ref name=ramirez>{{cite journal|bibcode=2000ApJ...537..205R|arxiv=astro-ph/0002062|title=Stellar Iron Abundances at the Galactic Center|journal=The Astrophysical Journal|volume=537|issue=1|pages=205–220|author1=Ramírez|first1=Solange V.|last2=Sellgren|first2=K.|last3=Carr|first3=John S.|last4=Balachandran|first4=Suchitra C.|last5=Blum|first5=Robert|last6=Terndrup|first6=Donald M.|last7=Steed|first7=Adam|year=2000|doi=10.1086/309022}}</ref> |
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| age_myr2=25<ref name=tetzlaff>{{cite journal|bibcode= 2011MNRAS.410..190T|title= A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun|journal= Monthly Notices of the Royal Astronomical Society|volume= 410|issue= 1|pages= 190–200|author1= Tetzlaff|first1= N.|last2= Neuhäuser|first2= R.|last3= Hohle|first3= M. M.|year= 2011|doi= 10.1111/j.1365-2966.2010.17434.x|arxiv = 1007.4883 }}</ref> |
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}} |
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{{Starbox catalog |
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| names=[[Variable star designation|VV]] Cep, [[Bright Star Catalogue|HR]] 8383, [[Hipparcos Catalogue|HIP]] 108317, [[Henry Draper Catalogue|HD]] 208816, [[Bonner Durchmusterung|BD]]+62°2007, [[Washington Double Star Catalog|WDS]] J21567+6338, [[2MASS]] J21563917+6337319, [[IRAS]] 21552+6323, [[AAVSO]] 2153+63 |
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}} |
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{{Starbox reference |
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| Simbad=VV_Cep |
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}} |
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{{Starbox end}} |
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'''VV Cephei''', juga dikenal sebagai '''HD 208816''', adalah sistem bintang biner yang terletak di Rasi Bintang [[Cepheus]], berjarak sekitar 5000 tahun cahaya dari Bumi.<ref>https://doi.org/10.1086%2F430901</ref> |
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Sistem |
Sistem ini memiliki 2 bintang, yaitu VV Cephei A yang merupakan bintang terbesar, dan VV Cephei B, sebuah bintang biru kecil. VV Cephei A adalah bintang [[Bintang Superraksasa merah|Superraksasa Merah]] dan memiliki ukuran sekitar 1900 kali ruas jari jari Matahari yang membuatnya salah satu bintang paling besar dan paling masif yang diketahui saat ini. Jika VV Cephei A ditempatkan di pusat Tata Surya kita, jari jarinya akan mencakup orbit jupiter dan hampir mencapai orbit Saturnus.<ref>{{Cite web|url=https://www.britannica.com/topic/VV-Cephei|title=VV Cephei {{!}} star|website=Encyclopedia Britannica|language=en|access-date=2020-02-09}}</ref> Namun, ukuran VV Cephei A belum ditentukan, karena memiliki ruas jari jari yang bervariasi sekitar 1050 - 1900. |
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== Lihat pula == |
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* [[Daftar bintang terbesar]] |
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* [[Raksasa merah]] |
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== Referensi == |
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{{Reflist}} |
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[[Kategori:Bintang ganda]] |
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[[Kategori:Bintang di konstelasi Cepheus]] |
Revisi terkini sejak 5 Agustus 2021 07.08
VV Cephei, juga dikenal sebagai HD 208816, adalah sistem bintang biner yang terletak di Rasi Bintang Cepheus, berjarak sekitar 5000 tahun cahaya dari Bumi.[16]
Sistem ini memiliki 2 bintang, yaitu VV Cephei A yang merupakan bintang terbesar, dan VV Cephei B, sebuah bintang biru kecil. VV Cephei A adalah bintang Superraksasa Merah dan memiliki ukuran sekitar 1900 kali ruas jari jari Matahari yang membuatnya salah satu bintang paling besar dan paling masif yang diketahui saat ini. Jika VV Cephei A ditempatkan di pusat Tata Surya kita, jari jarinya akan mencakup orbit jupiter dan hampir mencapai orbit Saturnus.[17] Namun, ukuran VV Cephei A belum ditentukan, karena memiliki ruas jari jari yang bervariasi sekitar 1050 - 1900.
Lihat pula
[sunting | sunting sumber]Referensi
[sunting | sunting sumber]- ^ a b c Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c d e Hopkins, Jeffrey L.; Bennett, Philip D.; Pollmann, Ernst (2015). "VV Cephei Eclipse Campaign 2017/19". The Society for Astronomical Sciences 34th Annual Symposium on Telescope Science. Published by Society for Astronomical Sciences. 34: 83. Bibcode:2015SASS...34...83H.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ a b c d e f Graczyk, D.; Mikolajewski, M.; Janowski, J. L. (1999). "The Sudden Period Change of VV Cephei". Information Bulletin on Variable Stars. 4679: 1. Bibcode:1999IBVS.4679....1G.
- ^
Bauer, W. H.; Bennett, P. D.; Brown, A. (2007). "An Ultraviolet Spectral Atlas of VV Cephei during Total Eclipse". Astrophysical Journal Supplement Series. 171 (1): 249–259. Bibcode:2007ApJS..171..249B. doi:10.1086/514334
.
- ^ Ginestet, N.; Carquillat, J. M. (2002). "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components". The Astrophysical Journal Supplement Series. 143 (2): 513. Bibcode:2002ApJS..143..513G. doi:10.1086/342942
.
- ^ a b c d e Kesalahan pengutipan: Tag
<ref>
tidak sah; tidak ditemukan teks untuk ref bernamawright
- ^ a b c Kesalahan pengutipan: Tag
<ref>
tidak sah; tidak ditemukan teks untuk ref bernamabennett
- ^ a b Bauer, W. H.; Gull, T. R.; Bennett, P. D. (2008). "Spatial Extension in the Ultraviolet Spectrum of Vv Cephei". The Astronomical Journal. 136 (3): 1312. Bibcode:2008AJ....136.1312H. doi:10.1088/0004-6256/136/3/1312.
- ^ a b Kesalahan pengutipan: Tag
<ref>
tidak sah; tidak ditemukan teks untuk ref bernamalate
- ^ Kesalahan pengutipan: Tag
<ref>
tidak sah; tidak ditemukan teks untuk ref bernamabennett2015
- ^ a b Kesalahan pengutipan: Tag
<ref>
tidak sah; tidak ditemukan teks untuk ref bernamacarr
- ^ Hack, M.; Engin, S.; Yilmaz, N.; Sedmak, G.; Rusconi, L.; Boehm, C. (1992). "Spectroscopic study of the atmospheric eclipsing binary VV Cephei". Astronomy and Astrophysics Supplement Series. 95: 589. Bibcode:1992A&AS...95..589H.
- ^ Ramírez, Solange V.; Sellgren, K.; Carr, John S.; Balachandran, Suchitra C.; Blum, Robert; Terndrup, Donald M.; Steed, Adam (2000). "Stellar Iron Abundances at the Galactic Center". The Astrophysical Journal. 537 (1): 205–220. arXiv:astro-ph/0002062
. Bibcode:2000ApJ...537..205R. doi:10.1086/309022.
- ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883
. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
- ^ https://doi.org/10.1086%2F430901
- ^ "VV Cephei | star". Encyclopedia Britannica (dalam bahasa Inggris). Diakses tanggal 2020-02-09.