Cannabaceae

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Mu Ophiuchi
Location of μ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 37m 50.71308s[1]
Declination −8° 07′ 07.5749″[1]
Apparent magnitude (V) 4.62[2]
Characteristics
Spectral type B8II-IIIp:Mn[3]
U−B color index −0.20[2]
B−V color index +0.11[2]
Astrometry
Radial velocity (Rv)−18.50[4] km/s
Proper motion (μ) RA: −11.31[5] mas/yr
Dec.: −20.47[5] mas/yr
Parallax (π)4.32 ± 0.20 mas[5]
Distance750 ± 30 ly
(230 ± 10 pc)
Absolute magnitude (MV)-2.24[6]
Details
Radius11.1+2.1
−0.6[1] R☉
Luminosity398.7±26.8[1] L☉
Temperature7,748+210
−651[1] K
Metallicity [Fe/H]+0.00[7] dex
Rotational velocity (v sin i)95[8] km/s
Other designations
μ Oph, 57 Ophiuchi, BD−08°4472, FK5 3399, GC 23889, HD 159975, HIP 86284, HR 6567, SAO 141772[9]
Database references
SIMBADdata

μ Ophiuchi, Latinized as Mu Ophiuchi, is a solitary,[10] blue-white hued star in the equatorial constellation of Ophiuchus. It is visible to the naked as a faint point of light with an apparent visual magnitude of 4.62.[2] This object is located approximately 760 light years away from the Sun based on parallax,[5] but is drifting closer with a radial velocity of −18.5 km/s.[4]

This object has a stellar classification of B8II-IIIp:Mn,[3] showing a luminosity class with mixed traits of a giant or bright giant star. The suffix notation indicates it is a candidate chemically peculiar star with an overabundance of manganese in its spectrum. It may be a mercury-manganese star.[11] This object has 11 times the radius of the Sun and is radiating nearly 400 times the Sun's luminosity from its photosphere at an effective temperature of 7,748 K.[1] It is spinning with a projected rotational velocity of 95 km/s.[8]

In 2006, a new nearby star cluster, Mamajek 2 (/ˈmæmədʒɛk/), was discovered. Mu Ophiuchi is a candidate member.[12] The cluster has an estimated age of 120±25 million years.[13]

References

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  1. ^ a b c d e f 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.
  2. ^ a b c d 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.
  3. ^ a b Cowley, A. (November 1972). "Spectral classification of the bright B8 stars". Astronomical Journal. 77: 750–755. Bibcode:1972AJ.....77..750C. doi:10.1086/111348.
  4. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  5. ^ a b c d 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. S2CID 18759600. Vizier catalog entry
  6. ^ 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. Vizier catalog entry
  7. ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778. Vizier catalog entry
  8. ^ a b Abt, Helmut A.; et al. (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  9. ^ "mu. Oph". SIMBAD. Centre de données astronomiques de Strasbourg.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  11. ^ Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  12. ^ Mamajek, Eric E. (2006). "A New Nearby Candidate Star Cluster in Ophiuchus at d = 170 pc". Astronomical Journal. 132 (5): 2198–2205. arXiv:astro-ph/0609064. Bibcode:2006AJ....132.2198M. doi:10.1086/508205. S2CID 14070978.
  13. ^ Jilinski, E.; et al. (January 2009). "Dynamical Evolution and Spectral Characteristics of the Stellar Group Mamajek 2". The Astrophysical Journal. 691 (1): 212–218. arXiv:0810.1198. Bibcode:2009ApJ...691..212J. doi:10.1088/0004-637X/691/1/212. S2CID 15570695.
source: Https://en.wikipedia.org/wiki/Mu_Ophiuchi

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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