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Star in the constellation Corona Australis
Theta Coronae Australis (Theta CrA),
Latinized from θ Coronae Australis , is a solitary yellow-hued
star
[14] located in the southern
constellation
Corona Australis . It has an
apparent magnitude of 4.61, making it readily visible to the
naked eye .
Gaia DR3
parallax measurements place it 530
light years away and it is currently drifting closer with a somewhat constrained heliocentric
radial velocity of −2.1
km/s . At its current distance, Theta CrA's brightness is diminished by three-tenths of a
magnitudes due to
interstellar dust .
[15] It has an
absolute magnitude of −1.54.
[6]
This is an
evolved
red giant with a
stellar classification of G8 III.
[3] It has 4.45 times the
mass of the Sun
[7] but has expanded to 29.1 times the
solar radius .
[8] It radiates 411 times the
luminosity of the Sun
[1] from its enlarged
photosphere at an
effective temperature of 4,907
K .
[10] Theta CrA has a solar
metallicity ;
[1] unlike most
giant stars of this type, Theta CrA has an unusually high rate of rotation with a
projected rotational velocity of 12
km/s .
[11] The star may also have
infrared excess , suggesting the presence of a
circumstellar disk .
[16] One possible explanation is that it may have engulfed a nearby
giant planet , such as a
hot Jupiter .
[16]
References
^
a
b
c
d
e
f
g Vallenari, A.; et al. (Gaia collaboration) (2023).
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arXiv :
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Bibcode :
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doi :
10.1051/0004-6361/202243940 .
S2CID
244398875 .
Gaia DR3 record for this source at
VizieR .
^ 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.
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ISSN
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^
a
b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −53° to −40° .
Bibcode :
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^
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 .
^ 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 :
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Bibcode :
2006AstL...32..759G .
doi :
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eISSN
1562-6873 .
ISSN
1063-7737 .
S2CID
119231169 .
^
a
b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346.
arXiv :
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doi :
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ISSN
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^
a
b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021).
"Stellar and substellar companions from Gaia EDR3" . Astronomy & Astrophysics . 657 : A7.
arXiv :
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Bibcode :
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doi :
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eISSN
1432-0746 .
ISSN
0004-6361 .
^
a
b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004).
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arXiv :
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Bibcode :
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doi :
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eISSN
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ISSN
0004-6361 .
^ Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II . Vol. 7734. pp. 77344E.
arXiv :
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Bibcode :
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doi :
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S2CID
32097037 .
^
a
b Blackwell, D. E.; Lynas-Gray, A. E. (May 1998).
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Bibcode :
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doi :
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eISSN
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ISSN
0365-0138 .
^
a
b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014).
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arXiv :
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Bibcode :
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doi :
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eISSN
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ISSN
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S2CID
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^ 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 :
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^
"* tet CrA" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 17 August 2017 .
^ 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).
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arXiv :
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Bibcode :
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doi :
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eISSN
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ISSN
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^
a
b da Silva, R. Rodrigues; Canto Martins, B. L.; De Medeiros, J. R. (4 March 2015).
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arXiv :
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doi :
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eISSN
1538-4357 .
S2CID
119271718 .