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μ Leporis

Location of μ Leporis (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Lepus
Right ascension	05 12 55.90296
Declination	−16° 12′ 19.6686″
Apparent magnitude (V)	3.259
Characteristics
Spectral type	B9 IV:HgMn
U−B color index	−0.357
B−V color index	−0.096
Variable type	Suspected α CVn
Astrometry
Radial velocity (Rv)	+27.7 km/s
Proper motion (μ)	RA: +45.702 mas/yr Dec.: −16.017 mas/yr
Parallax (π)	19.1775 ± 0.3265 mas
Distance	170 ± 3 ly (52.1 ± 0.9 pc)
Absolute magnitude (MV)	−0.49
Details
Mass	3.45 M☉
Radius	3.39±0.16 R☉
Luminosity	251 L☉
Surface gravity (log g)	3.85 cgs
Temperature	12,820±436 K
Metallicity	−0.05 dex
Rotational velocity (v sin i)	16±0.5 km/s
Age	125 Myr
Other designations
μ Lep, 5 Lep, BD−16°1072, FK5 1144, HD 33904, HIP 24305, HR 1702, SAO 150237
Database references
SIMBAD	data

Mu Leporis, Latinized from μ Leporis, is a star in the southern constellation of Lepus. The apparent visual magnitude is 3.259, making the star visible to the naked eye at night from the southern hemisphere. Parallax measurements yield an estimated distance of 170 light-years (52 parsecs) from the Earth. It is moving further from the Sun with a radial velocity of +27.7 km/s.

The stellar classification of this star is B9 IV:HgMn, although the ':' indicates an uncertain spectral value. The luminosity class of IV indicates that this is a subgiant that has exhausted the hydrogen at its core and it is in the process of evolving into a giant star. At present it has about 3.4 times the Sun's radius, 3.45 times the mass of the Sun, and is radiating 251 times the Sun's luminosity from its photosphere at an effective temperature of 12,800 K.

Mu Leporis is a suspected Alpha² Canum Venaticorum variable with a period of 2.933 days. The stellar spectrum of this star shows overabundances of mercury and manganese, as indicated by the HgMn in the stellar class. X-ray emission has been detected coming from a location at an angular separation of 0.93 arcseconds from this star. At the estimated distance of Mu Leporis, this equals a projected distance of 52 Astronomical Units. The source may be a stellar companion: either a star that has not yet reached the main sequence or a small, low-temperature star. The X-ray luminosity of this object is (4.4 ± 0.1) × 10 erg s.

References

1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. ^ Gutierrez-Moreno, Adelina; et al. (1966). "A System of photometric standards". Publications of the Department of Astronomy University of Chile. 1. Publicaciones Universidad de Chile, Department de Astronomy: 1–17. Bibcode:1966PDAUC...1....1G.
3. ^ Houk, N.; Smith-Moore, M. (1988). Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, Volume 4, Declinations -26°.0 to -12°.0. Ann Arbor, MI: Department of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
4. ^ Kochukhov, O.; et al. (October 2011). "No magnetic field in the spotted HgMn star μ Leporis". Astronomy & Astrophysics. 534: L13. arXiv:1110.0829. Bibcode:2011A&A...534L..13K. doi:10.1051/0004-6361/201117970. S2CID 54778846.
5. Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
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.
7. ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
8. ^ Smith, K. C.; Dworetsky, M. M. (July 1993). "Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra - Part One - Iron Peak Elements". Astronomy and Astrophysics. 274 (2): 335. Bibcode:1993A&A...274..335S.
9. "mu. Lep -- Variable Star of alpha2 CVn type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-09.
10. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
11. Kochukhov, O.; Khalack, V.; Kobzar, O.; Neiner, C.; Paunzen, E.; Labadie-Bartz, J.; David-Uraz, A. (October 2021). "TESS survey of rotational and pulsational variability of mercury–manganese stars". Monthly Notices of the Royal Astronomical Society. 506 (4): 5328–5344. arXiv:2107.09096. doi:10.1093/mnras/stab2107.
12. Behar, Ehud; et al. (September 2004). "Resolving X-Ray Sources from B Stars Spectroscopically: The Example of μ Leporis". The Astrophysical Journal. 612 (1): L65 – L68. arXiv:astro-ph/0407338. Bibcode:2004ApJ...612L..65B. doi:10.1086/424485. S2CID 18006589.

External links

• Jim Kaler's Stars, University of Illinois: MU LEP (Mu Leporis)

v t e Constellation of Lepus
Lepus in Chinese astronomy List of star names in Lepus List of stars in Lepus
Stars	Bayer α (Arneb) β (Nihal) γ δ ε ζ η θ ι κ λ μ ν Flamsteed 1 8 10 12 17 19 4 Mon Variable R T RX AF AK HR 1621 1762 HD 31527 32450 32667 33142 33283 Other 2MASS J0523−1403 Gliese 229 WASP-49 WASP-61
Exoplanets HD 33283 b
Star clusters Messier 79
Nebulae Abell 7 IC 418
Galaxies	NGC 1964 1979 1993 2139 Other IRAS 06076-2139 PKS 0454-234
Category

• Bayer objects
• Lepus (constellation)
• Flamsteed objects
• Hipparcos objects
• B-type subgiants
• Alpha2 Canum Venaticorum variables
• Henry Draper Catalogue objects
• Bright Star Catalogue objects
• Durchmusterung objects
• Mercury-manganese stars