Surf Wiki
Save to docs
general/g-type-giants

From Surf Wiki (app.surf) — the open knowledge base

Theta Coronae Australis

Star in the constellation Corona Australis

Star in the constellation Corona Australis

| b-v = +1.02 | u-b = +0.76 Theta Coronae Australis (Theta CrA), Latinized from θ Coronae Australis, is a solitary yellow-hued star located in the southernconstellation 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 . At its current distance, Theta CrA's brightness is diminished by three-tenths of a magnitudes due to interstellar dust. It has an absolute magnitude of −1.54.

This is an evolved red giant with a stellar classification of G8 III. It has 4.45 times the mass of the Sun but has expanded to 29.1 times the solar radius. It radiates 411 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of . Theta CrA has a solar metallicity; unlike most giant stars of this type, Theta CrA has an unusually high rate of rotation with a projected rotational velocity of . The star may also have infrared excess, suggesting the presence of a circumstellar disk. One possible explanation is that it may have engulfed a nearby giant planet, such as a hot Jupiter.

References

References

  1. {{Cite DR3. 6722114239093474048
  2. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory.
  3. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics.
  4. (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −53° to −40°".
  5. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters.
  6. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  7. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars". Astronomy & Astrophysics.
  8. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics.
  9. (May 1998). "Determination of the temperatures of selected ISO flux calibration stars using the Infrared Flux Method". Astronomy and Astrophysics Supplement Series.
  10. (20 December 2021). "Stellar and substellar companions from ''Gaia'' EDR3". Astronomy & Astrophysics.
  11. 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.
  12. (16 July 2010). "Optical and Infrared Interferometry II".
  13. "* tet CrA".
  14. (4 March 2015). "On the Nature of Rapidly Rotating Single Evolved Stars". The Astrophysical Journal.
  15. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society.
  16. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society.
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

g-type-giants corona-australis bayer-objects durchmusterung-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
Want to explore this topic further?

Ask Mako anything about Theta Coronae Australis — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report