Astronomy:Mu Normae
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Short description: Star in the constellation Norma
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 34m 05.02028s[1] |
| Declination | −44° 02′ 43.1281″[1] |
| Apparent magnitude (V) | 4.91[2] (4.87 - 4.98[3]) |
| Characteristics | |
| Apparent magnitude (U) | 4.05[4] |
| Apparent magnitude (B) | 4.99[4] |
| Apparent magnitude (J) | 4.74[4] |
| Apparent magnitude (H) | 4.679[5] |
| Apparent magnitude (K) | 4.612[5] |
| U−B color index | −0.84[4] |
| B−V color index | +0.05[4] |
| Variable type | Suspected α Cygni[3] |
| 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) | 0.78 ± 0.33[1] mas |
| Distance | 3,260 ly (1,000[7] pc) |
| Absolute magnitude (MV) | -6.45[2] |
| Details[8] | |
| Mass | 33.3[9] M☉ |
| Radius | 25[2] R☉ |
| Luminosity (bolometric) | 339,000[2] L☉ |
| Surface gravity (log g) | 2.90[2] cgs |
| Temperature | 28,000[2] K |
| Rotational velocity (v sin i) | 57[2] km/s |
| Age | 4.7[9] Myr |
| Other designations | |
Mu Normae, HD 149038, HR 6155, HIP 81122, CD−43°10900 | |
| Database references | |
| SIMBAD | data |
μ Normae, Latinised as Mu Normae, is a blue supergiant star of spectral type O9.7 Iab, located in the constellation of Norma.
It shines as bright as 339,000 suns and is weighs 40 solar masses. It varies in visual magnitude between 4.87 and 4.98, and is suspected of being an Alpha Cygni variable, which are named after Deneb.
It is in the same direction and at the same distance as the faint open cluster NGC 6169, although it is brighter than the combined magnitude of all the other stars in the cluster. It was considered the prototype of the μ Normae class of open clusters by Collinder.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Lefever, K.; Puls, J.; Aerts, C. (2007). "Statistical properties of a sample of periodically variable B-type supergiants". Astronomy and Astrophysics 463 (3): 1093–1109. doi:10.1051/0004-6361:20066038. Bibcode: 2007A&A...463.1093L. http://www.aanda.org/articles/aa/pdf/2007/09/aa6038-06.pdf.
- ↑ 3.0 3.1 Samus, N. N. 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.
- ↑ 4.0 4.1 4.2 4.3 4.4 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.
- ↑ 5.0 5.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 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): 1025–1039. doi:10.1086/498560. Bibcode: 2006ApJ...637.1025F.
- ↑ 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 (3): 1306. doi:10.1111/j.1365-2966.2010.16392.x. Bibcode: 2010MNRAS.404.1306F.
- ↑ 9.0 9.1 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
- ↑ Collinder, Per (1931). "On Structural Properties of Open Galactic Clusters and their Spatial Distribution. Catalog of Open Galactic Clusters". Annals of the Observatory of Lund 2: B1–B46. Bibcode: 1931AnLun...2....1C.
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