HD 167096
Binary star; Corona Australis
HD 167096 , also known as HR 6818 or rarely 4 G. Coronae Australis , is a binary star [ 16] located in the southern constellation Corona Australis . It has an apparent magnitude of 5.45,[ 2] making it faintly visible to the naked eye . The system is located relatively close at a distance of 224 light years based on Gaia DR3 parallax measurements[ 1] but is drifting closer with a poorly constrained heliocentric radial velocity of −27 km/s .[ 5] At its current distance HD 167096's brightness is diminished by three tenths of a magnitudes due to interstellar dust [ 17] and it has an absolute magnitude of +0.64.[ 6]
The primary has a stellar classification of G8/K0 III,[ 3] indicating that it is an evolved red giant with the characteristics of a G8 and K0 giant star . It has 1.11 times the mass of the Sun [ 8] but it has expanded to 8.92 times the Sun's radius .[ 9] It radiates 32.4 times the luminosity of the Sun [ 10] from its enlarged photosphere at an effective temperature of 4,886 K ,[ 11] giving it an orangish-yellow hue. It has a near solar metallicity at [Fe/H] = −0.02[ 12] and spins too slowly for its projected rotational velocity to be measured accurately. This is a binary star that completes a circular orbit within 1.81 years .[ 7] Since the two components have a separation of only 8.1 mas , it makes it difficult to measure their individual properties.[ 7]
References
^ a b c d e 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 .
^ 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 .
^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40° . Vol. 2. Bibcode :1978mcts.book.....H .
^ Corben, P. M. (1966). "Photoelectric magnitudes and colours for bright southern stars". Monthly Notes of the Astronomical Society of South Africa . 25 : 44. Bibcode :1966MNSSA..25...44C . ISSN 0024-8266 .
^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten . 328 (9): 889–896. arXiv :0705.0878 . Bibcode :2007AN....328..889K . doi :10.1002/asna.200710776 . eISSN 1521-3994 . ISSN 0004-6337 . S2CID 119323941 .
^ 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 .
^ a b c Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (October 2012). "Dynamical masses of a selected sample of orbital binaries" . Astronomy & Astrophysics . 546 : A69. Bibcode :2012A&A...546A..69M . doi :10.1051/0004-6361/201219774 . eISSN 1432-0746 . ISSN 0004-6361 . S2CID 122594428 .
^ a b c 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 .
^ a b 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 .
^ a b 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 .
^ a b 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 .
^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" . Astronomy & Astrophysics . 628 : A94. arXiv :1904.11302 . Bibcode :2019A&A...628A..94A . doi :10.1051/0004-6361/201935765 . eISSN 1432-0746 . ISSN 0004-6361 . S2CID 131780028 .
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *" . Astronomy & Astrophysics . 561 : A126. arXiv :1312.3474 . Bibcode :2014A&A...561A.126D . doi :10.1051/0004-6361/201220762 . eISSN 1432-0746 . ISSN 0004-6361 . S2CID 54046583 .
^ 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 .
^ "HD 167096" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved March 18, 2023 .
^ 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 .
^ 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 .