Astronomy:Mu Ophiuchi
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[5] mas |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 Cowley, A. (November 1972). "Spectral classification of the bright B8 stars.". Astronomical Journal 77: 750–755. doi:10.1086/111348. Bibcode: 1972AJ.....77..750C.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 5.2 5.3 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. Vizier catalog entry
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 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. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. Vizier catalog entry
- ↑ 8.0 8.1 Abt, Helmut A. et al. (2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. Bibcode: 2002ApJ...573..359A.
- ↑ "mu. Oph". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+Oph.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics 498 (3): 961–966. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R.
- ↑ Mamajek, Eric E. (2006). "A New Nearby Candidate Star Cluster in Ophiuchus at d = 170 pc". Astronomical Journal 132 (5): 2198–2205. doi:10.1086/508205. Bibcode: 2006AJ....132.2198M.
- ↑ Jilinski, E. et al. (January 2009). "Dynamical Evolution and Spectral Characteristics of the Stellar Group Mamajek 2". The Astrophysical Journal 691 (1): 212–218. doi:10.1088/0004-637X/691/1/212. Bibcode: 2009ApJ...691..212J.
 |  |
