19 Sextantis

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19 Sextantis
Sextans constellation map.svg
Red circle.svg
Location of 19 Sex on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 12m 48.36462s [1]
Declination +04° 36′ 52.8378″ [1]
Apparent magnitude  (V)5.78±0.01 [2]
Characteristics
Evolutionary stage red giant branch [3]
Spectral type K1 III [4] or K0 III [5]
U−B color index +1.11 [6]
B−V color index +1.18 [6]
Astrometry
Radial velocity (Rv)31.80±0.21 [7]  km/s
Proper motion (μ)RA: −50.538  mas/yr [1]
Dec.: −6.118  mas/yr [1]
Parallax (π)6.3184 ± 0.0625  mas [1]
Distance 516 ± 5  ly
(158 ± 2  pc)
Details
Mass 0.88+0.08
−0.03 [3]   M☉
Radius 23.13±1.17 [8]   R☉
Luminosity 241+4
−5 [1]   L☉
Temperature 4,576±123 [9]   K
Metallicity [Fe/H]−0.53 [10]   dex
Rotational velocity (v sin i)2.5±0.8 [4]  km/s
Age 7.94+1.83
−0.70 [3]   Gyr
Other designations
19 Sex, 34 G. Sextantis [11] , AG+04°1386, BD+05°2301, GC  14022, HD  88547, HIP  50027, HR  4004, SAO  118164, TIC  277696329 [12]
Database references
SIMBAD data

19 Sextantis (HD 88547; HR 4004; 34 G. Sextantis), or simply 19 Sex, is a solitary star [13] located in the equatorial constellation Sextans. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.78. [2] Gaia DR3 parallax measurements imply a distance of 516 light-years [1] and it is currently receding with a heliocentric radial velocity of 31.8  km/s . [7] At its current distance, 19 Sex's brightness is diminished by an interstellar extinction of 0.17 magnitudes. [14]

19 Sex has a stellar classification of K1 III, [4] indicating that it is an evolved K-type giant star that has ceased hydrogen fusion at it core and it has left the main sequence. It has also been given a slightly hotter class of K0 III. [5] Stellar evolution models from Stock et al. (2018) model it to be a red giant branch star (100% chance) [3] that is currently fusing a hydrogen shell around an inert helium core. It has 88% the mass of the Sun but at the age of 7.94 billion years, [3] it has expanded to 23.13 times the radius of the Sun. [8] It radiates 241 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 4,576  K . [9] 19 Sex is metal deficient with an iron abundance of [Fe/H] = −0.53 or 29.5% of the Sun's [10] and it spins modestly with a projected rotational velocity of 2.5  km/s . [4]

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<span class="mw-page-title-main">18 Sextantis</span> K-type giant star in the constellation Sextans

18 Sextantis, or simply 18 Sex, is a solitary star located in the southern constellation Sextans. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.62. Gaia DR3 parallax measurements imply a distance of 558 light-years and it is slowly receding with a poorly constrained heliocentric radial velocity of approximately 0.2 km/s. At its current distance, 18 Sex's brightness is diminished with an interstellar extinction of two-tenths of a magnitude and it has an absolute magnitude of −0.16.

References

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  2. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361. S2CID   17128864.
  3. 1 2 3 4 5 Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (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: A33. arXiv: 1805.04094 . Bibcode:2018A&A...616A..33S. doi: 10.1051/0004-6361/201833111 . ISSN   0004-6361. S2CID   247657118.
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  5. 1 2 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal. 81: 187. Bibcode:1935ApJ....81..187A. doi: 10.1086/143628 . eISSN   1538-4357. ISSN   0004-637X. S2CID   121056016.
  6. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  7. 1 2 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv: astro-ph/0409579 . Bibcode:2005A&A...430..165F. doi: 10.1051/0004-6361:20041272 . S2CID   17804304.
  8. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361. S2CID   6077801.
  9. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  10. 1 2 Hekker, S.; Meléndez, J. (December 2007). "Precise radial velocities of giant stars: III. Spectroscopic stellar parameters". Astronomy & Astrophysics. 475 (3): 1003–1009. arXiv: 0709.1145 . Bibcode:2007A&A...475.1003H. doi: 10.1051/0004-6361:20078233 . ISSN   0004-6361. S2CID   10436552.
  11. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  12. ↑ "*19 Sex". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved January 13, 2024.
  13. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  14. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
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