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(Redirected from Mu crucis)
Mu Crucis
Observation data
Epoch J2000       Equinox
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  mas [6]
Distance340 ± 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  mas [8]
Distance364 ± 9  ly
(112 ± 3  pc)
Absolute magnitude (MV)−0.40 [7]
Details
μ1 Cru
Mass7.7 [9]  M
Luminosity1,123 [7]  L
Surface gravity (log g)3.93 [10]  cgs
Temperature21,100 [10]  K
Metallicity [Fe/H]−0.21 [7]  dex
Age9.2 [9]  Myr
μ2 Cru
Mass5.0 [9]  M
Radius3.9 [11]  R
Luminosity205 [7]  L
Surface gravity (log g)3.40 [12]  cgs
Temperature20,400 [11]  K
Rotational velocity (v sin i)210 [12] km/s
Age15.9 [9]  Myr
Other designations
μ Cru, WD 12546-5711, CCDM 12546-5711 [13] [14]
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. ^ a b c d e f g h Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode: 1997A&A...323L..49P.
  2. ^ a b c d e f 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.
  3. ^ Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (1969). "MK Spectral Types for Bright Southern OB Stars". The Astrophysical Journal. 157: 313. Bibcode: 1969ApJ...157..313H. doi: 10.1086/150069.
  4. ^ 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. arXiv: astro-ph/0606149. Bibcode: 2006MNRAS.371..252L. doi: 10.1111/j.1365-2966.2006.10655.x. S2CID  16492030.
  5. ^ a b Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode: 1967IAUS...30...57E.
  6. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ a b c d e Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID  119257644.
  8. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  9. ^ a b c d 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. arXiv: 1007.4883. Bibcode: 2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x. S2CID  118629873.
  10. ^ a b 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. ^ a b c 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. Bibcode: 2007A&A...470..239Z. doi: 10.1051/0004-6361:20066615. hdl: 11336/38181.
  12. ^ a b Chauville, J.; Zorec, J.; Ballereau, D.; Morrell, N.; Cidale, L.; Garcia, A. (2001). "High and intermediate-resolution spectroscopy of be stars 4481 lines" (PDF). Astronomy and Astrophysics. 378: 861. Bibcode: 2001A&A...378..861C. doi: 10.1051/0004-6361:20011202.
  13. ^ "HR 4898". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-08.
  14. ^ "HIP 63005". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-08.
From Wikipedia, the free encyclopedia
(Redirected from Mu crucis)
Mu Crucis
Observation data
Epoch J2000       Equinox
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  mas [6]
Distance340 ± 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  mas [8]
Distance364 ± 9  ly
(112 ± 3  pc)
Absolute magnitude (MV)−0.40 [7]
Details
μ1 Cru
Mass7.7 [9]  M
Luminosity1,123 [7]  L
Surface gravity (log g)3.93 [10]  cgs
Temperature21,100 [10]  K
Metallicity [Fe/H]−0.21 [7]  dex
Age9.2 [9]  Myr
μ2 Cru
Mass5.0 [9]  M
Radius3.9 [11]  R
Luminosity205 [7]  L
Surface gravity (log g)3.40 [12]  cgs
Temperature20,400 [11]  K
Rotational velocity (v sin i)210 [12] km/s
Age15.9 [9]  Myr
Other designations
μ Cru, WD 12546-5711, CCDM 12546-5711 [13] [14]
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. ^ a b c d e f g h Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode: 1997A&A...323L..49P.
  2. ^ a b c d e f 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.
  3. ^ Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (1969). "MK Spectral Types for Bright Southern OB Stars". The Astrophysical Journal. 157: 313. Bibcode: 1969ApJ...157..313H. doi: 10.1086/150069.
  4. ^ 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. arXiv: astro-ph/0606149. Bibcode: 2006MNRAS.371..252L. doi: 10.1111/j.1365-2966.2006.10655.x. S2CID  16492030.
  5. ^ a b Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode: 1967IAUS...30...57E.
  6. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ a b c d e Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID  119257644.
  8. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  9. ^ a b c d 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. arXiv: 1007.4883. Bibcode: 2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x. S2CID  118629873.
  10. ^ a b 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. ^ a b c 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. Bibcode: 2007A&A...470..239Z. doi: 10.1051/0004-6361:20066615. hdl: 11336/38181.
  12. ^ a b Chauville, J.; Zorec, J.; Ballereau, D.; Morrell, N.; Cidale, L.; Garcia, A. (2001). "High and intermediate-resolution spectroscopy of be stars 4481 lines" (PDF). Astronomy and Astrophysics. 378: 861. Bibcode: 2001A&A...378..861C. doi: 10.1051/0004-6361:20011202.
  13. ^ "HR 4898". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-08.
  14. ^ "HIP 63005". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-08.

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