Astronomy:14 Andromedae

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Short description: Star in the constellation Andromeda
14 Andromedae / Veritate
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  23h 31m 17.41273s[1]
Declination +39° 14′ 10.3105″[1]
Apparent magnitude (V) 5.22[2]
Characteristics
Spectral type K0 III[3]
B−V color index 1.029±0.003[2]
Variable type None[4]
Astrometry
Radial velocity (Rv)−59.99±0.20[2] km/s
Proper motion (μ) RA: 287.292[1] mas/yr
Dec.: -83.758[1] mas/yr
Parallax (π)13.2289 ± 0.1245[1] mas
Distance247 ± 2 ly
(75.6 ± 0.7 pc)
Absolute magnitude (MV)0.73[2]
Details[5]
Mass1.12±0.24 or 2.2[3] M☉
Radius10.49±0.51 R☉
Luminosity60.3+12.1
−10.2 L☉
Surface gravity (log g)2.60±0.01 cgs
Temperature4,743±31 K
Metallicity [Fe/H]−0.30±0.04 dex
Rotational velocity (v sin i)1.63±0.47 km/s
Age4.96±2.84 Gyr
Other designations
Veritate, 14 And, NSV 14599, BD+38° 5023, GC 32703, HD 221345, HIP 116076, HR 8930, SAO 73311, PPM 88889, 2MASS J23311742+3914102[6]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

14 Andromedae, abbreviated 14 And, also named Veritate /ˌvɛrɪˈteɪtiː/,[7] is a single,[8] orange-hued giant star situated approximately 247 light-years away[1] in the northern constellation of Andromeda. It is dimly visible to the naked eye with an apparent visual magnitude of 5.22.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −60 km/s.[2] In 2008 an extrasolar planet (designated 14 Andromedae b, later named Spe) was discovered to be orbiting the star.[3]

This is a red clump[9] giant with a stellar classification of K0 III,[3] indicating it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.12[5] (or 2.2[3]) times the mass of the Sun and has expanded to 10.5 times the Sun's radius. It is radiating 60.3 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,743 K.[5]

Nomenclature

14 Andromedae is the star's Flamsteed designation. Following its discovery the planet was designated 14 Andromedae b.

In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.[10] The process involved public nomination and voting for the new names.[11] In December 2015, the IAU announced the winning names were Veritate for this star and Spe for its planet.[12]

The winning names were based on those submitted by the Thunder Bay Centre of the Royal Astronomical Society of Canada[13]); namely 'Veritas' and 'Spes', Latin for 'truth' and 'hope', respectively. (Veritas was also the Roman goddess of truth and Spes was the Roman goddess of hope.) The IAU substituted the ablative forms 'Veritate' and 'Spe', which mean 'where there is truth' and 'where there is hope', respectively. This was because 'Veritas' is the name of an asteroid important for the study of the solar system.[14]

In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. In its first bulletin of July 2016,[16] the WGSN explicitly recognized the names of exoplanets and their host stars approved by the Executive Committee Working Group Public Naming of Planets and Planetary Satellites, including the names of stars adopted during the 2015 NameExoWorlds campaign. This star is now so entered in the IAU Catalog of Star Names.[7]

Planetary system

In 2008, a planet was announced to be orbiting the star. The planet was found to have a minimum mass of 4.8 Jupiter masses and to be orbiting in a circular orbit that takes 186 days to complete. The planet is one of the few known planets to be orbiting an evolved intermediate-mass star and one of the innermost (such planets have only been discovered around clump giants).[3]

The 14 Andromedae planetary system[17]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b (Spe) >5.33 ± 0.57 MJ 0.83[3] 185.84 ± 0.23 0 — —

See also

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. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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 3.3 3.4 3.5 3.6 Sato, Bun'ei et al. (2008). "Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042". Publications of the Astronomical Society of Japan 60 (6): 1317–1326. doi:10.1093/pasj/60.6.1317. Bibcode: 2008PASJ...60.1317S. 
  4. ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S. 
  5. ↑ 5.0 5.1 5.2 Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics 574: A50. doi:10.1051/0004-6361/201424474. Bibcode: 2015A&A...574A..50J. 
  6. ↑ "14 And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=14+And. 
  7. ↑ 7.0 7.1 "IAU Catalog of Star Names". http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt. 
  8. ↑ 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. 
  9. ↑ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A. 
  10. ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
  11. ↑ "NameExoWorlds The Process". http://nameexoworlds.iau.org/process. 
  12. ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
  13. ↑ Thunder Bay Amateur Astronomers Name a Planet
  14. ↑ "NameExoWorlds The Approved Names". http://nameexoworlds.iau.org/names. 
  15. ↑ "IAU Working Group on Star Names (WGSN)". https://www.iau.org/science/scientific_bodies/working_groups/280/. 
  16. ↑ "Bulletin of the IAU Working Group on Star Names, No. 1". http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf. 
  17. ↑ Ligi, R. et al. (2012). "A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, υ Andromedae and 42 Draconis". Astronomy and Astrophysics 545: A5. doi:10.1051/0004-6361/201219467. Bibcode: 2012A&A...545A...5L. https://www.aanda.org/articles/aa/full_html/2012/09/aa19467-12/aa19467-12.html. 

External links

Coordinates: Sky map 23h 31m 17.4139s, +39° 14′ 10.313″



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