  | |
| 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] |
| Distance | 750 ± 30
ly (230 ± 10 pc) |
| Absolute magnitude (MV) | -2.24 [6] |
| Details | |
| Radius | 11.1+2.1 −0.6 [1] R☉ |
| Luminosity | 398.7±26.8 [1] L☉ |
| Temperature | 7,748+210 −651 [1] K |
| Metallicity [Fe/H] | +0.00 [7] dex |
| Rotational velocity (v sin i) | 95 [8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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
- ^ 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
- ^ 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
- ^ 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.
- ^ "mu. Oph". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
