HD 203842

Last updated
HD 203842
Equuleus constellation map.svg
Red circle.svg
Location of HD 203842 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 24m 24.56372s [1]
Declination +10° 10′ 27.1976″ [1]
Apparent magnitude  (V)6.32±0.01 [2]
Characteristics
Evolutionary stage Hertzsprung gap [3]
Spectral type F5 III [4]
U−B color index +0.13 [5]
B−V color index +0.47 [5]
Astrometry
Radial velocity (Rv)−21.8±3.6 [6]  km/s
Proper motion (μ)RA: +75.072  mas/yr [1]
Dec.: +20.436  mas/yr [1]
Parallax (π)8.7242 ± 0.1771  mas [1]
Distance 374 ± 8  ly
(115 ± 2  pc)
Absolute magnitude  (MV)+1.06 [7]
Details
Mass 2.00 [8]   M☉
Radius 4.54±0.23 [9]   R☉
Luminosity 31.1±1.2 [1]   L☉
Surface gravity (log g)3.47 [10]   cgs
Temperature 6,271±42 [11]   K
Metallicity [Fe/H]+0.19+0.04
−0.05 [12]   dex
Rotational velocity (v sin i)80.6 [13]  km/s
Age 1.24 [8]   Gyr
Other designations
30 G. Equulei [14] , AG+09°2981, BD+09°4800, GC  29969, HD  203842, HIP  105695, HR  8191, SAO  126774 [15]
Database references
SIMBAD data

HD 203842, also known as HR 8191 or rarely 30 G. Equueli, is a solitary, yellowish-white hued star located in the constellation Equuleus. It has an apparent magnitude of 6.32, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 374 light years, [1] and it is currently drifting closer with a somewhat constrained heliocentric radial velocity of −21.8  km/s . [6] At its current distance HD 203842's brightness is diminished by 0.15 magnitudes due to interstellar dust [16] and it has an absolute magnitude of +1.06. [7]

A 2005 Hipparcos survey noticed variations in its proper motion, which would indicate that it is an astrometric binary. [17] However, a subsequent survey revealed that HD 203842 is not an astrometric binary (32% chance) and is more likely to be solitary. [18] This object is part of the Hyades Stream. [19]

HD 203842 has a stellar classification of F5 III, [4] indicating that it is an evolved F-type giant star. It is currently in the Hertzsprung gap, meaning that it exhausting its supply of hydrogen and evolving towards the red giant branch. It has double times the Sun's mass but at the age of 1.24 billion years, [8] it has expanded to 4.54 times the Sun's radius. [9] It radiates 31.1 times the Sun's luminosity [1] from its enlarged photosphere at an effective temperature of 6,271  K . [11] HD 203842 is metal enriched with 155% the Sun's iron abundance [12] and spins quickly with a projected rotational velocity of 80.6  km/s . [13]

Related Research Articles

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HD 92589 is a double star in the constellation Antlia. The system has a combined apparent magnitude of 6.39, placing it near the limit of naked eye visibility. The system is located about 590 light years away based on its parallax shift and has a heliocentric radial velocity of 11 km/s. This indicates that it is drifting away from the Solar System.

HD 165259, also known as HR 6751 is a triple star system located in the southern circumpolar constellation of Apus. It has an apparent magnitude of 5.86, making it faintly visible to the naked eye Parallax measurements place the system at a distance of 138 light years, and it is currently receding with a heliocentric radial velocity of 13.1 km/s.

HD 161988, also known as HR 6635, is a solitary, orange hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.07, allowing it to be faintly visible to the naked eye. Parallax measurements place it at a distance of 621 light years, and it is currently receding with a heliocentric radial velocity of 36.8 km/s.

HD 190984, also known as HIP 99496, is a star located in the southern circumpolar constellation Pavo, the peacock. It has an apparent magnitude of 8.76, making it readily visible in small telescopes, but not to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 486 light years away from the Solar System. It appears to be receding with a heliocentric radial velocity of 20.3 km/s.

<span class="mw-page-title-main">HD 24479</span> Star in the constellation Camelopardalis

HD 24479, also designated as HR 1204, is a solitary, bluish-white hued star located in the northern circumpolar constellation Camelopardalis. The star is visible to the naked eye with an apparent visual magnitude of 5.04. Based on Gaia DR3 parallax measurements, it is located 385 light years from the Sun. However, it is receding with a somewhat constrained heliocentric radial velocity of 4.6 km/s. At its current distance, HD 24479's brightness is diminished by 0.29 magnitudes due to interstellar dust.

Kappa<sup>2</sup> Coronae Australis Star in the constellation Corona Australis

Kappa2 Coronae Australis, Latinized from κ2 Coronae Australis, is the primary of a probable binary system located in the southern constellation Corona Australis. It is visible to the naked eye as a bluish-white hued star with an apparent visual magnitude of 5.59. The distance to this star is roughly 710 light years based on Gaia DR3 parallax measurements. The radial velocity is poorly constrained, but the star appears to be moving closer with a radial velocity of around −15 km/s. At its current distance, Kappa2 CrA's brightness is diminished by 0.45 magnitudes due to interstellar dust.

<span class="mw-page-title-main">Beta Microscopii</span> Constellation Microscopium star

Beta Microscopii, Latinized from β Microscopii, is a solitary star in the constellation Microscopium. It is close to the lower limit of stars that are visible to the naked eye having an apparent visual magnitude of 6.05 Based upon an annual parallax shift of 6.5022 mas as seen from Earth, this star is located 502 light years away from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.19 due to interstellar dust.

HD 86267, also known as HR 3932, is a solitary orange-hued star located in the southern constellation Antlia. It has an apparent magnitude of 5.82, allowing it to be faintly seen with the naked eye. Parallax measurements place it a distance of 514 light years and it is currently receding with a heliocentric radial velocity of 3.7 km/s.

HD 50002 is a solitary star in the southern circumpolar constellation Volans. It is faintly visible to the naked eye with an apparent magnitude of 6.09 and is located at a distance of 708 light years. However, it is drifting further with a heliocentric radial velocity of 5.1 km/s.

HD 222806 is a suspected astrometric binary in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.74, allowing it to be faintly seen with the naked eye. Parallax measurements place the system at a distance of 565 light years and it is currently receding with a heliocentric radial velocity of 21 km/s.

HD 193721 is an astrometric binary in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.77, allowing it to be faintly seen with the naked eye. Parallax measurements place the system 760 light years away from the Solar System and it is currently receding with a heliocentric radial velocity 8.6 km/s.

HD 193373 is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21, placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant and it is currently receding with a heliocentric radial velocity of 22.7 km/s.

HD 182509, also designated as HR 7370, is an orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 5.69, making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 635 light years. It has a poorly constrained heliocentric radial velocity of −5 km/s, indicating that it is drifting towards the Solar System.

HD 33519, also known as HR 1682, is a probable spectroscopic binary located in the southern circumpolar constellation Mensa. It is one of the stars near the limit of naked eye visibility, having an apparent magnitude of 6.28. The system is relatively far at a distance of 940 light years but is approaching with a heliocentric radial velocity of −2.5 km/s. However, this value is poorly constrained.

HD 58425, also known as HR 2830, is an astrometric binary located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as an orang point of light at an apparent magnitude of 5.64. Based on parallax measurements from Gaia DR3, the system is estimated to be 470 light years away from Earth. It appears to be rapidly receding from the Sun, having a heliocentric radial velocity of 58.6 km/s. HD 58425 is listed as 54 Ursae Majoris in Johann Hevelius' catalogue, but this was dropped after the official IAU's official constellation borders were drawn.

HD 32820, also known as HR 1651, is a yellowish-white hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.3, placing it near the limit of naked eye visibility. The object is located relatively close at a distance of 103 light years based on parallax measurements from Gaia DR3, but is receding with a heliocentric radial velocity of 29.8 km/s.

<span class="mw-page-title-main">HD 40091</span> Star in the constellation Columba

HD 40091, also known as HR 2082, is a solitary star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.54, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 501 light years distant. However, it is rapidly receding with a high heliocentric radial velocity of 114 km/s.

HR 8526, also known as HD 212168, is the primary of a triple star located in the southern circumpolar constellation Octans. The star and its companion have apparent magnitudes of 6.12 and 9.36 respectively. The system is located relatively close at a distance of 76 light years based on Gaia DR3 parallax measurements, but is receding with a heliocentric radial velocity of 15 km/s.

HD 177365 is a visual binary located in the southern constellation Telescopium. It has an apparent magnitude of 6.27, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 373 light-years and it is currently receding with a heliocentric radial velocity of 15.5 km/s. At its current distance, HD 177365's brightness is diminished by two-tenths of a magnitude due to interstellar extinction and it has an absolute magnitude of +0.16.

References

  1. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  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.
  3. ↑ Wallerstein, George; Bohm-Vitense, Erika; Vanture, Andrew D.; Gonzalez, Guillermo (June 1994). "The lithium content and other properties of F2-G5 giants in the Hertzsprung Gap". The Astronomical Journal. 107: 2211. Bibcode:1994AJ....107.2211W. doi: 10.1086/117031 . ISSN   0004-6256. S2CID   122349333.
  4. 1 2 Roman, Nancy G. (December 1955). "A Catalogue of High-Velocity Stars". The Astrophysical Journal Supplement Series. 2: 195. Bibcode:1955ApJS....2..195R. doi: 10.1086/190021 . eISSN   1538-4365. ISSN   0067-0049.
  5. 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.
  6. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  7. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  8. 1 2 3 Demarque, Pierre; Woo, Jong-Hak; Kim, Yong-Cheol; Yi, Sukyoung K. (December 2004). "Y2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series. 155 (2): 667–674. arXiv: astro-ph/0409024 . Bibcode:2004ApJS..155..667D. doi: 10.1086/424966 . eISSN   1538-4365. ISSN   0067-0049.
  9. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 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.
  10. ↑ Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv: 1103.4651 . Bibcode:2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276 . eISSN   1432-0746. ISSN   0004-6361. S2CID   56118016.
  11. 1 2 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv: 1507.01466 . Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN   1538-3881. ISSN   0004-6256. S2CID   118505114.
  12. 1 2 Bochanski, John J.; Faherty, Jacqueline K.; Gagné, Jonathan; Nelson, Olivia; Coker, Kristina; Smithka, Iliya; Desir, Deion; Vasquez, Chelsea (12 March 2018). "Fundamental Properties of Co-moving Stars Observed byGaia". The Astronomical Journal. 155 (4): 149. arXiv: 1801.00537 . Bibcode:2018AJ....155..149B. doi: 10.3847/1538-3881/aaaebe . eISSN   1538-3881. S2CID   119256051.
  13. 1 2 Solano, E.; Fernley, J. (April 1997). "Spectroscopic survey of δ Scuti stars". Astronomy and Astrophysics Supplement Series. 122 (1): 131–147. Bibcode:1997A&AS..122..131S. doi: 10.1051/aas:1997329 . eISSN   1286-4846. ISSN   0365-0138.
  14. ↑ 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.
  15. ↑ "HD 203842". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 2, 2021.
  16. ↑ 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.
  17. ↑ Makarov, V. V.; Kaplan, G. H. (May 2005). "Statistical Constraints for Astrometric Binaries with Nonlinear Motion". The Astronomical Journal. 129 (5): 2420–2427. Bibcode:2005AJ....129.2420M. doi: 10.1086/429590 . eISSN   1538-3881. ISSN   0004-6256. S2CID   55186471.
  18. ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data". Astronomy & Astrophysics. 464 (1): 377–392. arXiv: astro-ph/0612449 . Bibcode:2007A&A...464..377F. doi: 10.1051/0004-6361:20065526 . eISSN   1432-0746. ISSN   0004-6361. S2CID   14010423.
  19. ↑ Montes, D.; López-Santiago, J.; Gálvez, M. C.; Fernández-Figueroa, M. J.; De Castro, E.; Cornide, M. (1 November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society. 328 (1): 45–63. arXiv: astro-ph/0106537 . Bibcode:2001MNRAS.328...45M. doi: 10.1046/j.1365-8711.2001.04781.x . ISSN   0035-8711. S2CID   55727428.
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