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Luminous G-type star; Triangulum Australe
Delta Trianguli Australis (Delta TrA),
Latinized from δ Trianguli Australis , is a solitary,
[14] yellow-hued star in the
constellation
Triangulum Australe . It has an
apparent magnitude of 3.84,
[2] making it readily visible to the
naked eye under ideal conditions,
Parallax measurements place the object at a distance of 606
light years (182 parsecs).
[1] It has a heliocentirc
radial velocity of −4.9
km/s ,
[5] indicating that it is drifting towards the
Solar System .
Delta TrA has a
stellar classification of G2 Ib-IIa
[3] — an evolved
G-type star with a
luminosity class intermediate between a low luminosity
supergiant and a
bright giant . At present it has 6.5 times the
mass of the Sun
[7] and has an enlarged
radius of 53.6 R ☉ .
[8] It radiates at 1,210 times the
luminosity of the Sun
[9] from its
photosphere at an
effective temperature of 4,705
K .
[8] Delta TrA has an
iron abundance 89% that of the
Sun ,
[10] placing it around solar
metallicity . It spins modestly with a
projected rotational velocity of 8.2
km/s , which is high for stars of this type.
[11]
References
^
a
b
c
d
e van Leeuwen, Floor (13 August 2007).
"Validation of the new Hipparcos reduction" . Astronomy & Astrophysics . 474 (2): 653–664.
arXiv :
0708.1752 .
Bibcode :
2007A&A...474..653V .
doi :
10.1051/0004-6361:20078357 .
eISSN
1432-0746 .
ISSN
0004-6361 .
Hipparcos 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 .
^
a
b Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series . 71 : 245.
Bibcode :
1989ApJS...71..245K .
doi :
10.1086/191373 .
eISSN
1538-4365 .
ISSN
0067-0049 .
^
a
b Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals . 7 .
Bibcode :
1971ROAn....7.....C .
^
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 .
^ 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 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021).
"Stellar and substellar companions from Gaia EDR3" . Astronomy & Astrophysics . 657 : A7.
arXiv :
2109.10912 .
Bibcode :
2022A&A...657A...7K .
doi :
10.1051/0004-6361/202142146 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^
a
b
c
d 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 .
^
a
b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012).
"Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos" . Monthly Notices of the Royal Astronomical Society . 427 (1): 343–357.
arXiv :
1208.2037 .
Bibcode :
2012MNRAS.427..343M .
doi :
10.1111/j.1365-2966.2012.21873.x .
ISSN
0035-8711 .
^
a
b
c Luck, R. Earle (2 May 2014).
"Parameters and Abundances in Luminous Stars" . The Astronomical Journal . 147 (6): 137.
Bibcode :
2014AJ....147..137L .
doi :
10.1088/0004-6256/147/6/137 .
eISSN
1538-3881 .
ISSN
0004-6256 .
^
a
b 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" . Astronomy & Astrophysics . 561 : A126.
arXiv :
1312.3474 .
Bibcode :
2014A&A...561A.126D .
doi :
10.1051/0004-6361/201220762 .
eISSN
1432-0746 .
ISSN
0004-6361 .
^ 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 .
^
"del TrA" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved August 15, 2022 .
^ Eggleton, P. P.; Tokovinin, A. A. (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 ,
S2CID
14878976 .