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Eta2 Coronae Australis

Star in the constellation Corona Austrlis

Summary

Star in the constellation Corona Austrlis

| b-v = −0.08

Eta2 Coronae Australis (Eta2 CrA), Latinized from η2 Coronae Australis, is a solitary star located in the southern constellation of Corona Australis. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.59. Gaia DR3 parallax measurements imply a distance of 770 light years from the Solar System, but it is drifting closer with a radial velocity of . At its current distance Eta2 CrA's brightness is diminished by 0.27 magnitudes due to stellar extinction from interstellar dust and it has an absolute magnitude of −0.24.

This object has a stellar classification of B9 IV, indicating that is a slightly evolved a B-type subgiant star. However, Zorec & Royer (2012) model it to be a dwarf star that has completed 80.4% of its main sequence lifetime. It is estimated to be 213 million years old and it has a mass that is 3.23 times that of the Sun. The star is radiating 171 times the luminosity of the Sun from its photosphere 5.82 times the radius of the Sun at an effective temperature of . Eta2 CrA has a near-solar metallicity at [Fe/H] = +0.06 and spins modestly with a projected rotational velocity of . Some earlier catalogues listed the object as a chemically peculiar star but that status is now considered to be doubtful.

Sources

References

  1. {{Cite DR3. 6715206179328140032
  2. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society.
  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: Declinations −53° to −40°".
  5. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of Southern Africa.
  6. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters.
  7. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.
  8. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics.
  9. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics.
  10. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Symposium - International Astronomical Union.
  11. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for ''Gaia'' DR2 stars brighter than ''G'' = 18". Astronomy & Astrophysics.
  12. "Eta02 CrA".
  13. 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.
  14. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics.
  15. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society.
Wikipedia Source

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b-type-subgiants corona-australis bayer-objects durchmusterung-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects gould-objects
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