43 Sagittarii

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43 Sagittarii
Sagittarius constellation map.svg
Red circle.svg
Location of 43 Sagittarii (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Sagittarius
Right ascension 19h 17m 38.07906s [1]
Declination −18° 57′ 10.4626″ [1]
Apparent magnitude  (V)4.88 [2]
Characteristics
Spectral type G8II-III [3]
U−B color index +0.81 [4]
B−V color index +1.02 [4]
Astrometry
Radial velocity (Rv)+15.20 [5]  km/s
Proper motion (μ)RA: −10.341 [1]   mas/yr
Dec.: −10.892 [1]   mas/yr
Parallax (π)6.9681 ± 0.1875  mas [1]
Distance 470 ± 10  ly
(144 ± 4  pc)
Absolute magnitude  (MV)-0.96 [2]
Details [6]
Mass 3.30  M☉
Radius 23.99  R☉
Luminosity 277  L☉
Surface gravity (log g)2.22  cgs
Temperature 4,813  K
Metallicity [Fe/H]−0.18  dex
Rotational velocity (v sin i)4.2 [7]  km/s
Age 350±100 [8]   Myr
Other designations
d Sgr, 43 Sgr, BD−19°5379, GC  26589, HD  180540, HIP  94820, HR  7304, SAO  162413, GSC  06304-00334 [9]
Database references
SIMBAD data

43 Sagittarii is a single [10] star in the southern constellation of Sagittarius. It has the Bayer designation d Sagittarii, while 43 Sagittarii is the Flamsteed designation. [9] This object is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.88. [2] From parallax measurements, it is estimated to lie around 470  light years away from the Sun. [1] The star is drifting further from the Earth with a heliocentric radial velocity of +15.2 km/s. [5] It is located near the ecliptic and thus is subject to lunar occultations. [11]

This is an aging giant/bright giant star with a stellar classification of G8II-III, [3] and is most likely (97% chance) on the horizontal branch. [8] It is around 350 [8]  million years old with 3.3 [6] times the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star has expanded to 24 [6] times the Sun's radius and is now generating energy through core helium fusion. It is radiating 277 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,813 K. [6]

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References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 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. Vizier catalog entry
  3. 1 2 Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050 (5th Revised ed.). Bibcode:1995yCat.5050....0H.
  4. 1 2 Mermilliod, J. C. (2006). "Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M. Vizier catalog entry
  5. 1 2 Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. ISBN   9780598216885. LCCN   54001336.
  6. 1 2 3 4 Reffert, Sabine; et al. (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv: 1412.4634 . Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID   59334290. Vizier catalog entry
  7. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID   54046583. Vizier catalog entry
  8. 1 2 3 Stock, Stephan; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv: 1805.04094 , Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, S2CID   119361866, A33.
  9. 1 2 "d Sgr". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-07-22.
  10. ↑ 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.
  11. ↑ Richichi, A.; et al. (May 1996). "New binary stars discovered by lunar occultations. II". Astronomy and Astrophysics. 309: 163–170. Bibcode:1996A&A...309..163R.
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