From Wikipedia, the free encyclopedia
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 .