Astronomy:88 Leonis

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Short description: Star in the constellation Leo
88 Leonis
Observation data
{{#ifeq:J2000.0 (ICRS)|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0 (ICRS)]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0 (ICRS)}}
Constellation Leo[1]
A
Right ascension  11h 31m 44.94416s[2]
Declination +14° 21′ 52.2107″[2]
Apparent magnitude (V) 6.27[3]
B
Right ascension  11h 31m 44.41783s[4]
Declination +14° 22′ 05.6745″[4]
Apparent magnitude (V) 9.22[5]
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type F9.5V[6]
U−B color index +0.07[3]
B−V color index +0.57[3]
B
Evolutionary stage main sequence[7]
Spectral type G5[5]
U−B color index +1.03[8]
B−V color index +1.14[8]
Astrometry
A
Radial velocity (Rv)−4.78±0.13[2] km/s
Proper motion (μ) RA: −3329.873[2] mas/yr
Dec.: −189.925[2] mas/yr
Parallax (π)42.6536 ± 0.0726[4] mas
Distance76.5 ± 0.1 ly
(23.44 ± 0.04 pc)
Absolute magnitude (MV)+4.30[9]
B
Radial velocity (Rv)−4.59±0.17[4] km/s
Proper motion (μ) RA: −315.623[4] mas/yr
Dec.: −181.122[4] mas/yr
Parallax (π)42.3382 ± 0.0223[4] mas
Distance77.04 ± 0.04 ly
(23.62 ± 0.01 pc)
Absolute magnitude (MV)+7.31[9]
Details
88 Leo A
Mass1.06[10] M☉
Radius1.12[10] R☉
Luminosity1.40[7] L☉
Surface gravity (log g)4.25[11] cgs
Temperature5,990[10] K
Metallicity [Fe/H]+0.03[10] dex
Rotation14.32 days[12]
Rotational velocity (v sin i)1.7[13] km/s
Age4.12[14] Gyr
88 Leo B
Mass0.69[15] M☉
Radius0.72[15] R☉
Luminosity0.18[15] L☉
Surface gravity (log g)4.57[15] cgs
Temperature4,423[15] K
Other designations
STF 1547 AB, 88 Leonis, BD+15°2345, HD 100180, HIP 56242, HR 4437, WDS J11317+1422, Wolf 401[16]
88 Leo A: GJ 3669, SAO 99648, LTT 13145[16]
88 Leo B: GJ 3670, SAO 99647, LTT 13146[17]
Database references
SIMBADdata
B

88 Leonis is a wide binary[18] star system in the equatorial constellation of Leo, the lion. The system is near the lower limit of visibility to the naked eye with a combined apparent visual magnitude of 6.2.[19] It is located at a distance of 77 light years from the Sun based on parallax, but is drifting closer with a radial velocity of about −4.6 km/s. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.379 arc seconds per annum.[20]

The primary member of the system, component A, is a yellow-white hued F-type main-sequence star with a stellar classification of F9.5V.[6] It is an estimated 4.1 billion years old[14] and is spinning with a rotation period of 14.3 days.[12] The star has a short magnetic activity cycle that averages around 3.5 years. A second cycle appears to vary over time, lasting 13.7 years at the start of observations then decreasing to 8.6 years over a span of 34 years of measurement.[12] The star has 1.1 times the mass of the Sun and 1.1 times the Sun's radius.[10] It is radiating 1.5 times the luminosity of the Sun from its photosphere[7] at an effective temperature of 5,990 K.[10]

The secondary, component B, is a magnitude 9.22[5] star at an angular separation of 15.46″ from the primary along a position angle of 326°.[21] It has a class of G5[5] and 69% of the Sun's mass.[15] The pair share a common proper motion through space with a projected separation of 360.6 astronomical unit|AU.[21]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Chalov, S. V. (2019). "The behavior of electrons at the heliospheric shock transition". Astrophysics and Space Science 364 (10). doi:10.1007/s10509-019-3667-0. Bibcode: 2019Ap&SS.364..175C. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 5.2 5.3 Halbwachs, J. -L. et al. (2017), "Double stars with wide separations in the AGK3 - II. The wide binaries and the multiple systems", Monthly Notices of the Royal Astronomical Society 464 (4): 4966, doi:10.1093/mnras/stw2683, Bibcode: 2017MNRAS.464.4966H. 
  6. ↑ 6.0 6.1 Gray, R. O. et al. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G. 
  7. ↑ 7.0 7.1 7.2 Hardegree-Ullman, Kevin K.; Apai, Dániel; Bergsten, Galen J.; Pascucci, Ilaria; López-Morales, Mercedes (2023). "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets". The Astronomical Journal 165 (6): 267. doi:10.3847/1538-3881/acd1ec. Bibcode: 2023AJ....165..267H. 
  8. ↑ 8.0 8.1 Myers, J. R.; Sande, C. B.; Miller, A. C.; ((Warren, W. H., Jr.)); Tracewell, D. A. (2015). "VizieR Online Data Catalog: SKY2000 Master Catalog, Version 5 (Myers+ 2006)". Vizier Online Data Catalog. Bibcode: 2015yCat.5145....0M. 
  9. ↑ 9.0 9.1 Holmberg, J.; Nordström, B.; Andersen, J. (2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics 501 (3): 941. doi:10.1051/0004-6361/200811191. Bibcode: 2009A&A...501..941H. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 Hirsch, Lea A.; Rosenthal, Lee; Fulton, Benjamin J.; Howard, Andrew W.; Ciardi, David R.; Marcy, Geoffrey W.; Nielsen, Eric; Petigura, Erik A. et al. (2021). "Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc". The Astronomical Journal 161 (3): 134. doi:10.3847/1538-3881/abd639. Bibcode: 2021AJ....161..134H. 
  11. ↑ Hinkel, Natalie R. et al. (October 2017), "A Catalog of Stellar Unified Properties (CATSUP) for 951 FGK-Stars within 30 pc", The Astrophysical Journal 848 (1): 19, doi:10.3847/1538-4357/aa8b0f, 34, Bibcode: 2017ApJ...848...34H. 
  12. ↑ 12.0 12.1 12.2 Oláh, K. et al. (July 2009), "Multiple and changing cycles of active stars. II. Results", Astronomy and Astrophysics 501 (2): 703–713, doi:10.1051/0004-6361/200811304, Bibcode: 2009A&A...501..703O. 
  13. ↑ Baum, Anna C.; Wright, Jason T.; Luhn, Jacob K.; Isaacson, Howard (2022). "Five Decades of Chromospheric Activity in 59 Sun-like Stars and New Maunder Minimum Candidate HD 166620". The Astronomical Journal 163 (4): 183. doi:10.3847/1538-3881/ac5683. Bibcode: 2022AJ....163..183B. 
  14. ↑ 14.0 14.1 Isaacson, Howard et al. (2024). "The California Legacy Survey. V. Chromospheric Activity Cycles in Main-sequence Stars". The Astrophysical Journal Supplement Series 274 (2): 35. doi:10.3847/1538-4365/ad676c. Bibcode: 2024ApJS..274...35I. 
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  16. ↑ 16.0 16.1 "88 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=88+Leo. 
  17. ↑ "88 Leo B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=88+Leo+B. 
  18. ↑ Halbwachs, J. -L et al. (2018), "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs", Astronomy and Astrophysics 619: A81, doi:10.1051/0004-6361/201833377, Bibcode: 2018A&A...619A..81H 
  19. ↑ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H. 
  20. ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483–1522, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L. 
  21. ↑ 21.0 21.1 Tokovinin, A.; Kiyaeva, O. (February 2016), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society 456 (2): 2070–2079, doi:10.1093/mnras/stv2825, Bibcode: 2016MNRAS.456.2070T. 



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