Astronomy:Mu Crucis
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Short description: Star in the constellation Crux
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Crux |
| μ1 Crucis | |
| Right ascension | 12h 54m 35.6249s[1] |
| Declination | −57° 10′ 40.527″[1] |
| Apparent magnitude (V) | 4.03[2] |
| μ2 Crucis | |
| Right ascension | 12h 54m 36.8865s[1] |
| Declination | −57° 10′ 07.214″[1] |
| Apparent magnitude (V) | 5.19[2] |
| Characteristics | |
| μ1 Cru | |
| Spectral type | B2IV-V[3] |
| U−B color index | −0.75[2] |
| B−V color index | −0.17[2] |
| μ2 Cru | |
| Spectral type | B5Vne[4] |
| U−B color index | −0.50[2] |
| B−V color index | −0.11[2] |
| Astrometry | |
| μ1 Cru | |
| Radial velocity (Rv) | +13.9[5] km/s |
| Proper motion (μ) | RA: −30.45[1] mas/yr Dec.: −13.55[1] mas/yr |
| Parallax (π) | 9.6267 ± 0.3611[6] mas |
| Distance | 340 ± 10 ly (104 ± 4 pc) |
| Absolute magnitude (MV) | −1.49[7] |
| μ2 Cru | |
| Radial velocity (Rv) | +13[5] km/s |
| Proper motion (μ) | RA: −32.35[1] mas/yr Dec.: −10.93[1] mas/yr |
| Parallax (π) | 8.9486 ± 0.2264[8] mas |
| Distance | 364 ± 9 ly (112 ± 3 pc) |
| Absolute magnitude (MV) | −0.40[7] |
| Details | |
| μ1 Cru | |
| Mass | 7.7[9] M☉ |
| Luminosity | 1,123[7] L☉ |
| Surface gravity (log g) | 3.93[10] cgs |
| Temperature | 21,100[10] K |
| Metallicity [Fe/H] | −0.21[7] dex |
| Age | 9.2[9] Myr |
| μ2 Cru | |
| Mass | 5.0[9] M☉ |
| Radius | 3.9[11] R☉ |
| Luminosity | 205[7] L☉ |
| Surface gravity (log g) | 3.40[12] cgs |
| Temperature | 20,400[11] K |
| Rotational velocity (v sin i) | 210[12] km/s |
| Age | 15.9[9] Myr |
| Other designations | |
| μ1 Cru: HR 4898, CD-56°4688, HD 112092, SAO 240366, HIP 63003 | |
| μ2 Cru: HR 4899, CD-56°4689, HD 112091, SAO 240367, HIP 63005 | |
| Database references | |
| SIMBAD | μ Cru |
| μ1 Cru | |
| μ2 Cru | |
Mu Crucis, Latinized from μ Crucis, is the seventh-brightest star in the constellation Crux commonly known as the Southern Cross. μ Crucis is a wide double star of spectral class B stars, magnitude 4.0 and 5.2 respectively. They lie about 370 light-years away, and both stars are likely physically attached. The brighter component is known as μ1 Crucis or μ Crucis A, while the fainter is μ2 Crucis or μ Crucis B.
μ1 Crucis is the brighter of the two stars with an apparent magnitude of 4.0. It is a hot massive main sequence or subgiant star, over a thousand times as luminous as the sun.
μ2 Crucis is the fainter of the pair. Its apparent magnitude is 5.2 and it is a Be star, a star spinning so quickly that it has ejected a disc of material that creates emission lines in its spectrum. The disc is inclined at 36° to our line of sight.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Perryman, M. A. C. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode: 1997A&A...323L..49P.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99): 99. Bibcode: 1966CoLPL...4...99J.
- ↑ Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (1969). "MK Spectral Types for Bright Southern OB Stars". The Astrophysical Journal 157: 313. doi:10.1086/150069. Bibcode: 1969ApJ...157..313H.
- ↑ Levenhagen, R. S.; Leister, N. V. (2006). "Spectroscopic analysis of southern B and be stars". Monthly Notices of the Royal Astronomical Society 371 (1): 252–262. doi:10.1111/j.1365-2966.2006.10655.x. Bibcode: 2006MNRAS.371..252L.
- ↑ 5.0 5.1 Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". University of Toronto: International Astronomical Union. Bibcode: 1967IAUS...30...57E.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 7.0 7.1 7.2 7.3 7.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 9.0 9.1 9.2 9.3 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
- ↑ 10.0 10.1 Kilian, J. (1994). "Chemical abundances in early B-type stars. V. Metal abundances and LTE/NLTE comparison". Astronomy and Astrophysics 282: 867. Bibcode: 1994A&A...282..867K.
- ↑ 11.0 11.1 11.2 Zorec, J.; Arias, M. L.; Cidale, L.; Ringuelet, A. E. (2007). "Be star disc characteristics near the central object". Astronomy & Astrophysics 470 (1): 239–247. doi:10.1051/0004-6361:20066615. Bibcode: 2007A&A...470..239Z.
- ↑ 12.0 12.1 Chauville, J.; Zorec, J.; Ballereau, D.; Morrell, N.; Cidale, L.; Garcia, A. (2001). "High and intermediate-resolution spectroscopy of be stars 4481 lines". Astronomy and Astrophysics 378: 861. doi:10.1051/0004-6361:20011202. Bibcode: 2001A&A...378..861C. http://ri.conicet.gov.ar/bitstream/11336/36962/2/CONICET_Digital_Nro.da657706-52b0-4788-843c-67c34222e14c_A.pdf.
- ↑ "HR 4898". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+4898.
- ↑ "HIP 63005". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HIP+63005.
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