HD 84607

HD 84607
Location of HD 84607 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 09h 46m 23.61048s[1]
Declination +01° 47′ 08.1160″[1]
Apparent magnitude (V) 5.64±0.01[2]
Characteristics
Spectral type F0/2 IV[3]
U−B color index +0.12[4]
B−V color index +0.34[4]
Astrometry
Radial velocity (Rv)7.8±0.3[5] km/s
Proper motion (μ) RA: −55.710 mas/yr[1]
Dec.: −40.437 mas/yr[1]
Parallax (π)13.0508 ± 0.0651 mas[1]
Distance250 ± 1 ly
(76.6 ± 0.4 pc)
Absolute magnitude (MV)+1.12[6]
Details
Mass2.01[7] M☉
Radius3.43±0.17[8] R☉
Luminosity26.29+0.34
−0.31[1] L☉
Surface gravity (log g)3.61±0.08[9] cgs
Temperature6,919±111[10] K
Metallicity [Fe/H]+0.14[11] dex
Rotation1.51 d[12]
Rotational velocity (v sin i)93.1±4.7[12] km/s
Age1.06[7] Gyr
Other designations
1 G. Sextantis[13], AG+02°1299, BD+02°2246, FK5 2782, GC 13459, HD 84607, HIP 47960, HR 3879, SAO 117901, TIC 455274792[14]
Database references
SIMBADdata

HD 84607 (HR 3879; 1 G. Sextantis) is a solitary star[15] located in the equatorial constellation Sextans. It is faintly visible to the naked eye as a yellowish-white hued point of light with an apparent magnitude of 5.64.[2] The object is located relatively close at a distance of 250 light-years based on Gaia DR3 parallax measurements,[1] but it is receding with a heliocentric radial velocity of 7.8 km/s.[5] At its current distance, HD 84607's brightness is diminished by an interstellar extinction of 0.18 magnitudes[16] and it has an absolute magnitude +1.12.[6]

HD 84607 has a stellar classification of F0/2 IV,[3] indicating that it is a slightly evolved star with the characteristics of a F0 and F2 subgiant. At the age of 1.06 billion years,[7] the star is ceasing hydrogen fusion at its core and is cooling and expanding onto the red giant branch. It has 2.01 times the mass of the Sun[7] and a slightly enlarged radius 3.43 times that of the Sun.[8] It radiates 26.29 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 6,919 K.[10] HD 84607 is metal enriched with an iron abundance of [Fe/H] = +0.14 or 138% of the Sun's[11] and it spins fairly quickly with a projected rotational velocity of 93.1 km/s within 1.51 days.[12]

References

  1. ^ a b c d e f g 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. ^ a b 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. ^ a b Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. Vol. 5. Bibcode:1999mctd.book.....H.
  4. ^ a b 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.
  5. ^ a b 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.
  6. ^ a b 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.
  7. ^ a b c d David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.
  8. ^ a b 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. ^ Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361. S2CID 13365201.
  10. ^ a b 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. ^ a b Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711. S2CID 119034918.
  12. ^ a b c Reiners, A. (January 2006). "Rotation- and temperature-dependence of stellar latitudinal differential rotation". Astronomy & Astrophysics. 446 (1): 267–277. arXiv:astro-ph/0509399. Bibcode:2006A&A...446..267R. doi:10.1051/0004-6361:20053911. eISSN 1432-0746. ISSN 0004-6361.
  13. ^ 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.
  14. ^ "HD 84607". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved January 3, 2024.
  15. ^ 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.
  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.