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| constell = [[Norma (constellation)|Norma]]
| constell = [[Norma (constellation)|Norma]]
| pronounce =
| pronounce =
| ra = {{RA|16|34|05.02028}}<ref name=hipparcos>{{cite journal|bibcode=2007A&A...474..653V}}</ref>
| ra = {{RA|16|34|05.02028}}<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|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357}}</ref>
| dec = {{DEC|-44|02|43.1281}}<ref name=hipparcos/>
| dec = {{DEC|-44|02|43.1281}}<ref name=hipparcos/>
| appmag_v = 4.91<ref name=lefever/>
| appmag_v = 4.91<ref name=lefever/>
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| class = O9.7Iab<ref name=lefever/>
| class = O9.7Iab<ref name=lefever/>
| appmag_1_passband = U
| appmag_1_passband = U
| appmag_1 = 4.05<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D}}</ref>
| appmag_1 = 4.05<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati|first1=J. R.|year=2002}}</ref>
| appmag_2_passband = B
| appmag_2_passband = B
| appmag_2 = 4.99<ref name=ducati/>
| appmag_2 = 4.99<ref name=ducati/>
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| appmag_3 = 4.74<ref name=ducati/>
| appmag_3 = 4.74<ref name=ducati/>
| appmag_4_passband = H
| appmag_4_passband = H
| appmag_4 = 4.679<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|author1=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>
| appmag_4 = 4.679<ref name=2mass>{{cite journal|bibcode=2003yCat.2246....0C}}</ref>
| appmag_5_passband = K
| appmag_5_passband = K
| appmag_5 = 4.612<ref name=2mass/>
| appmag_5 = 4.612<ref name=2mass/>
Line 38: Line 38:
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = +6.30<ref>{{cite journal|bibcode= 2006AstL...32..759G}}</ref>
| radial_v = +6.30<ref>{{cite journal|bibcode= 2006AstL...32..759G|title= Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal= Astronomy Letters|volume= 32|issue= 11|pages= 759|author1= Gontcharov|first1= G. A.|year= 2006|doi= 10.1134/S1063773706110065}}</ref>
| prop_mo_ra = 0.02<ref name=hipparcos/>
| prop_mo_ra = 0.02<ref name=hipparcos/>
| prop_mo_dec = &minus;1.98<ref name=hipparcos/>
| prop_mo_dec = &minus;1.98<ref name=hipparcos/>
Line 49: Line 49:
{{Starbox detail
{{Starbox detail
| source =
| source =
| mass = 40<ref name=fraser>{{cite journal|bibcode=2010MNRAS.404.1306F|arxiv=1001.3337}}</ref>
| mass = 40<ref name=fraser>{{cite journal|bibcode=2010MNRAS.404.1306F|arxiv=1001.3337|title=Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants|journal=Monthly Notices of the Royal Astronomical Society|volume=404|pages=1306|author1=Fraser|first1=M.|last2=Dufton|first2=P. L.|last3=Hunter|first3=I.|last4=Ryans|first4=R. S. I.|year=2010|doi=10.1111/j.1365-2966.2010.16392.x}}</ref>
| radius = 25<ref name=lefever/>
| radius = 25<ref name=lefever/>
| gravity = 2.91<ref name=lefever/>
| gravity = 2.91<ref name=lefever/>

Revision as of 21:07, 18 January 2016

Mu Normae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Norma
Right ascension 16h 34m 05.02028s[1]
Declination −44° 02′ 43.1281″[1]
Apparent magnitude (V) 4.91[2]
Characteristics
Spectral type O9.7Iab[2]
Apparent magnitude (U) 4.05[3]
Apparent magnitude (B) 4.99[3]
Apparent magnitude (J) 4.74[3]
Apparent magnitude (H) 4.679[4]
Apparent magnitude (K) 4.612[4]
U−B color index −0.84[3]
B−V color index +0.05[3]
Variable type Suspected α Cygni[5]
Astrometry
Radial velocity (Rv)+6.30[6] km/s
Proper motion (μ) RA: 0.02[1] mas/yr
Dec.: −1.98[1] mas/yr
Parallax (π)0.70 ± 0.73 mas[1]
Distance1,000[7] pc
Absolute magnitude (MV)-6.45[2]
Details
Mass40[8] M☉
Radius25[2] R☉
Luminosity (bolometric)339,000[2] L☉
Surface gravity (log g)2.91[2] cgs
Temperature28,000[2] K
Rotational velocity (v sin i)57[2] km/s
Age~4[citation needed] Myr
Other designations
Mu Normae, HD 149038, HR 6155, HIP 81122
Database references
SIMBADdata

Mu Normae is a blue supergiant star of spectral type O9.71ab in the constellation Norma.[9] It is one of the most luminous stars known. Uncertainties in its distance mean it could be up to a million times as luminous and 60 times as massive as the Sun, though is more likely to have around 500,000 times its luminosity and 40 times its mass..[10] It is suspected of being an Alpha Cygni variable, which are named after the similar star Deneb. Being a blue supergiant, it is likely to become a red supergiant in a few million years and eventually a type-II supernova.

References

  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c d e f g h Lefever, K.; Puls, J.; Aerts, C. (2007). "Statistical properties of a sample of periodically variable B-type supergiants". Astronomy and Astrophysics. 463 (3): 1093. Bibcode:2007A&A...463.1093L. doi:10.1051/0004-6361:20066038.
  3. ^ a b c d e Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  4. ^ a b Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C.
  5. ^ 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: 02025. Bibcode:2009yCat....102025S.
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. ^ Fullerton, A. W.; Massa, D. L.; Prinja, R. K. (2006). "The Discordance of Mass‐Loss Estimates for Galactic O‐Type Stars". The Astrophysical Journal. 637 (2): 1025. Bibcode:2006ApJ...637.1025F. doi:10.1086/498560.
  8. ^ Fraser, M.; Dufton, P. L.; Hunter, I.; Ryans, R. S. I. (2010). "Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants". Monthly Notices of the Royal Astronomical Society. 404: 1306. arXiv:1001.3337. Bibcode:2010MNRAS.404.1306F. doi:10.1111/j.1365-2966.2010.16392.x.
  9. ^ Sota, A.; Maíz Apellániz, J.; Morrell, N.I.; Barbá, R.H.; Walborn, N.R.; Gamen, R.C.; Arias, J.I.; Alfaro, E.J. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement. 211 (1): 84. arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. 10.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  10. ^ Kaler, James B. "Mu Normae". Stars. University of Illinois. Retrieved 19 May 2015.
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