Astronomy:HD 24496

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Short description: Binary star system in the constellation Taurus
HD 24496
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus
Right ascension  03h 54m 28.03326s[1]
Declination +16° 36′ 57.7897″[1]
Apparent magnitude (V) 6.81[2] (6.9 + 11.1)[3]
Characteristics
Spectral type G7V[4] + M2V[5]
Apparent magnitude (B) 7.529[2]
Apparent magnitude (R) 6.40[2]
Apparent magnitude (I) 6.000[2]
Apparent magnitude (J) 5.384±0.024[2]
Apparent magnitude (H) 5.102±0.026[2]
Apparent magnitude (K) 4.995±0.017[2]
B−V color index 0.719±0.001[2]
Astrometry
Radial velocity (Rv)+18.99±0.09[2] km/s
Proper motion (μ) RA: +214.191[1] mas/yr
Dec.: −167.336[1] mas/yr
Parallax (π)48.8107 ± 0.0474[1] mas
Distance66.82 ± 0.06 ly
(20.49 ± 0.02 pc)
Absolute magnitude (MV)5.26[2]
Details[6]
A
Mass0.956+0.030
−0.036 M☉
Radius0.91±0.03 R☉
Luminosity0.705+0.073
−0.076 L☉
Surface gravity (log g)4.52+0.03
−0.04 cgs
Temperature5,572±44 K
Metallicity [Fe/H]−0.01±0.03 dex
Rotational velocity (v sin i)0.0±0.5 km/s
Age3.316+3.88
−3.16 Gyr
B
Mass0.53[7] M☉
Other designations
BD+16°527, GC 4699, GJ 3255, HD 24496, HIP 18267, SAO 93662, PPM 119451, WDS J03545+1637A, LTT 11292, NLTT 12133[8]
Database references
SIMBADdata

HD 24496 is a binary star[9] system in the equatorial constellation of Taurus. The combined apparent visual magnitude of the pair is 6.81,[2] which is too faint to be readily visible to the normal human eye. The system is located at a distance of 66.8 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +19 km/s.[2] It is traversing the celestial sphere with a proper motion of 0.276″ per year.[10]

The magnitude 6.9[3] primary star, designated component A, is a G-type main-sequence star with a stellar classification of G7V.[4] It is around three billion years old with a low projected rotational velocity. The star has 96% of the mass of the Sun and 91% of the Sun's radius. The metallicity, what astronomers term the abundance of heavier elements, is about the same as in the Sun. The star is radiating 71% of the luminosity of the Sun from its photosphere at an effective temperature of 5,572 K.[6]

The secondary companion, component B, is a magnitude 11.1[3] red dwarf of class M2V[5] that shares a common proper motion with the primary.[11] They have an angular separation of 2.7″ along a position angle of 256°, which is equivalent to a physical projected separation of 55.2 astronomical unit|AU.[5] Their orbital period is around 123,000 years.[7]

References

  1. ↑ 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. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 
  4. ↑ 4.0 4.1 Koen, C. et al. (2010), "UBV(RI)C JHK observations of Hipparcos-selected nearby stars", Monthly Notices of the Royal Astronomical Society 403 (4): 1949, doi:10.1111/j.1365-2966.2009.16182.x, Bibcode: 2010MNRAS.403.1949K. 
  5. ↑ 5.0 5.1 5.2 Raghavan, Deepak et al. (September 2010), "A Survey of Stellar Families: Multiplicity of Solar-type Stars", The Astrophysical Journal Supplement 190 (1): 1–42, doi:10.1088/0067-0049/190/1/1, Bibcode: 2010ApJS..190....1R. 
  6. ↑ 6.0 6.1 Marsden, S. C. et al. (November 2014), "A BCool magnetic snapshot survey of solar-type stars", Monthly Notices of the Royal Astronomical Society 444 (4): 3517–3536, doi:10.1093/mnras/stu1663, Bibcode: 2014MNRAS.444.3517M. 
  7. ↑ 7.0 7.1 Tokovinin, Andrei (2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal 147 (4): 87, doi:10.1088/0004-6256/147/4/87, Bibcode: 2014AJ....147...87T. 
  8. ↑ "HD 24496". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+24496. 
  9. ↑ Fuhrmann, K. et al. (February 2017), "Multiplicity among Solar-type Stars", The Astrophysical Journal 836 (1): 23, doi:10.3847/1538-4357/836/1/139, 139, Bibcode: 2017ApJ...836..139F. 
  10. ↑ 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. 
  11. ↑ Abt, Helmut A.; Willmarth, Daryl (January 2006), "The Secondaries of Solar-Type Primaries. I. The Radial Velocities", The Astrophysical Journal Supplement Series 162 (1): 207–226, doi:10.1086/498095, Bibcode: 2006ApJS..162..207A. 

Coordinates: Sky map 03h 54m 28.0332s, +16° 36′ 57.793″



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