Iota Leporis

Iota Leporis
Location of ι Leporis (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension 05h 12m 17.90190s
Declination −11° 52′ 09.1863″
Apparent magnitude (V) 4.45
Characteristics
Spectral type B7.5 Vn + K7.2 XR? + G8 Ve
U−B color index −0.40
B−V color index −0.10
Astrometry
Radial velocity (Rv)+23.50 km/s
Proper motion (μ) RA: +24.39 mas/yr
Dec.: −31.02 mas/yr
Parallax (π)14.07±0.16 mas
Distance232 ± 3 ly
(71.1 ± 0.8 pc)
Absolute magnitude (MV)0.01
Details
ι Lep A
Mass3.37±0.02 M☉
Luminosity153 L☉
Surface gravity (log g)4.25 cgs
Temperature13,781±469 K
Rotational velocity (v sin i)185 km/s
Age94 Myr
Other designations
ι Lep, 3 Lep, BD−12°1095, GC 6374, HD 33802, HIP 24244, HR 1696, SAO 150223, CCDM J05123-1152A, WDS J05123-1152A
Database references
SIMBADdata

Iota Leporis (ι Leporis) is a triple star system in the southern constellation of Lepus. It is visible to the naked eye as a point source of blue-white light with an apparent visual magnitude of 4.45. Based upon an annual parallax shift of 14.07 mas as measured from Earth, the system is located roughly 232 light years from the Sun.

A light curve for AM Leporis, adapted from Huélamo et al. (2004)

The primary, designated component A, is a B-type main-sequence star with a stellar classification of B7.5 Vn, where the 'n' suffix indicates "nebulous" absorption lines caused by rotation. It is about 94 million years old and has a high rate of spin with a projected rotational velocity of 185 km/s. With an estimated 3.4 times the mass of the Sun, it is radiating 153 times the Sun's luminosity from its photosphere at an effective temperature of around 13,781 K.

There is a close companion that is a source of X-ray emission. Most likely this star has at least 1.05 times the mass of the Sun. The third component, AM Leporis, is a BY Draconis variable of apparent magnitude 9.92, and spectral type G8Ve at an angular separation of 12.7".

References

  1. 1 2 3 4 5 6 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.
  2. 1 2 3 4 5 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: 0, Bibcode:2002yCat.2237....0D.
  3. 1 2 Garrison, R. F.; et al. (1994), "The late B-type stars: refined MK classification, confrontation with Stromgren photometry, and the effects of rotation", The Astronomical Journal, 107 (4): 1556–1564, Bibcode:1994AJ....107.1556G, doi:10.1086/116967.
  4. 1 2 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.
  5. ↑ Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776, S2CID 119323941.
  6. 1 2 3 4 Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452, S2CID 17507782.
  7. 1 2 3 4 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  8. 1 2 3 4 5 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.
  9. ↑ "iot Lep", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-08-18.
  10. ↑ Huélamo, N.; Fernández, M.; Neuhäuser, R.; Wolk, S. J. (December 2004). "Rotation periods of Post-T Tauri stars in Lindroos systems" (PDF). Astronomy and Astrophysics. 428 (3): 953–967. arXiv:astro-ph/0408226. Bibcode:2004A&A...428..953H. doi:10.1051/0004-6361:20034442. S2CID 10656237. Retrieved 29 June 2022.
  11. ↑ Kazarovets, E. V.; et al. (2008), "The 79th name-list of variable stars", Information Bulletin on Variable Stars, 5863 (1): 1, Bibcode:2008IBVS.5863....1K.
  12. ↑ Gahm, G. F.; et al. (1983), "A study of visual double stars with early type primaries. I - Spectroscopic results", Astronomy and Astrophysics Supplement Series, 51: 143–159, Bibcode:1983A&AS...51..143G.
  13. ↑ Dommanget, J.; et al. (2002), "Catalog of Components of Double & Multiple stars", Observations et Travaux, 54 (5), Bibcode:2002yCat.1274....0D. Vizier result