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δ Eridani
Location of δ Eridani (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Eridanus
Right ascension 03h 43m 14.90088s [1]
Declination –09° 45′ 48.2084″ [1]
Apparent magnitude (V) 3.51 - 3.56 [2]
Characteristics
Evolutionary stage Subgiant
Spectral type K0 IV [3]
U−B color index +0.69 [4]
B−V color index +0.92 [4]
Variable type Suspected RS CVn [2]
Astrometry
Radial velocity (Rv)−6.28±0.09 [5] km/s
Proper motion (μ) RA: −93.16 [1]  mas/ yr
Dec.: +743.64 [1]  mas/ yr
Parallax (π)110.61 ± 0.29  mas [1]
Distance29.49 ± 0.08  ly
(9.04 ± 0.02  pc)
Absolute magnitude (MV)3.77 [6]
Details [7]
Mass1.33±0.07 [8]  M☉
Radius2.35±0.01  R☉
Luminosity3.17±0.09  L☉
Surface gravity (log g)3.66±0.1  cgs
Temperature5,027±48  K
Metallicity [Fe/H]+0.07±0.03  dex
Rotational velocity (v sin i)0.7±0.6 [8] km/s
Age6.194 [9]  Gyr
Other designations
Rana, δ Eridani, 23 Eridani, del Eri, NSV 1246, BD−10°728, GJ 150, HD 23249, HIP 17378, HR 1136, SAO 130686, LHS 1581 [10]
Database references
SIMBAD data

Delta Eridani, which is Latinized from δ Eridani, is the fifth-brightest star in the constellation of Eridanus.

The star is visible to the naked eye and has been observed to vary slightly in brightness between magnitudes 3.51 and 3.56, [2] although subsequent observations did not bear this out. [11] It is relatively near to the Sun, with a distance of about 29.5  light years as determined from parallax. [1] The star is drifting closer with a radial velocity of −6 km/s. [5]

Delta Eridani is sometimes called Rana: [12] Rana means "the frog" in Latin, but derivation of this name is uncertain. The name was approved by the International Astronomic Union on 4 April 2022. [13]

Structure

The stellar classification of this star is K0 IV, [3] matching a subgiant star that has exhausted its core hydrogen. This has caused the star to expand and become cooler than a comparable main sequence star. Stellar modelling indicates it is near the end of the subgiant stage and about to transition into a giant. It is an estimated six [9] billion years old with 33% more mass than the Sun. [8] The star has 2.35 times the size of the Sun and is radiating three times the Sun's luminosity from its photosphere at an effective temperature of 5,022 K. [7]

Delta Eridani is catalogued as a suspected RS Canum Venaticorum variable in 1983, [14] but the activity level for the star is so low that this is considered doubtful. This class of variables occurs in close binary systems. A low projected rotational velocity of under 1 km/s and the lack of radial velocity variation suggests that this putative variable is being viewed from nearly pole-on. However, an examination of the star using interferometry does not detect the presence of a companion at the expected distance. [9]

Chinese name

In Chinese, 天苑 (Tiān Yuàn), meaning Celestial Meadows, refers to an asterism consisting of δ Eridani, γ Eridani, π Eridani, ε Eridani, ζ Eridani, η Eridani, π Ceti, τ1 Eridani, τ2 Eridani, τ3 Eridani, τ4 Eridani, τ5 Eridani, τ6 Eridani, τ7 Eridani, τ8 Eridani and τ9 Eridani. [15] Consequently, the Chinese name for δ Eridani itself is 天苑三 (Tiān Yuàn sān, English: the Third Star of Celestial Meadows.) [16]

See also

References

  1. ^ a b c d e f van Leeuwen, F. (2007). "HIP 17378". Hipparcos, the New Reduction. Retrieved 2009-12-11.
  2. ^ a b c Samus', N. N; et al. (2017). "General catalogue of variable stars". Astronomy Reports. GCVS 5.1. 61 (1): 80. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. S2CID  125853869.
  3. ^ a b Spinrad, Hyron; Taylor, Benjamin J. (1969). "Scanner Abundance Studies. I. an Investigation of Supermetallicity in Late-Type Evolved Stars". Astrophysical Journal. 157: 1279. Bibcode: 1969ApJ...157.1279S. doi: 10.1086/150154.
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
  5. ^ a b Jofré, E.; et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv: 1410.6422. Bibcode: 2015A&A...574A..50J. doi: 10.1051/0004-6361/201424474. S2CID  53666931.
  6. ^ Pizzolato, N.; et al. (September 2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics. 361: 614–628. Bibcode: 2000A&A...361..614P.
  7. ^ a b Rains, Adam D.; et al. (April 2020). "Precision angular diameters for 16 southern stars with VLTI/PIONIER". Monthly Notices of the Royal Astronomical Society. 493 (2): 2377–2394. arXiv: 2004.02343. Bibcode: 2020MNRAS.493.2377R. doi: 10.1093/mnras/staa282.
  8. ^ a b c Bruntt, H.; et al. (July 2010). "Accurate fundamental parameters for 23 bright solar-type stars". Monthly Notices of the Royal Astronomical Society. 405 (3): 1907–1923. arXiv: 1002.4268. Bibcode: 2010MNRAS.405.1907B. doi: 10.1111/j.1365-2966.2010.16575.x. S2CID  118495267.
  9. ^ a b c Thévenin, F.; et al. (June 2005). "VLTI/VINCI diameter constraints on the evolutionary status of δ Eri, ξ Hya, η Boo". Astronomy and Astrophysics. 436 (1): 253–262. arXiv: astro-ph/0501420. Bibcode: 2005A&A...436..253T. doi: 10.1051/0004-6361:20042075. S2CID  118169489.
  10. ^ "Del Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-11.
  11. ^ Eaton, J. A.; Poe, C. H. (April 1985). "Limits on the Variability of epsilon Eridani and delta Eridani". Information Bulletin on Variable Stars. 2712: 1. Bibcode: 1985IBVS.2712....1E.
  12. ^ Bečvář, A. (1951). Atlas Coeli Skalnaté Pleso II - Katalog 1950.0. Přírodovědecké Vydavatelstrí. p. 277. Retrieved 27 May 2019.
  13. ^ "Naming Stars".
  14. ^ Fisher, G. F.; et al. (January 1983). "Delta Eridani: a Very Bright New Variable Star". Information Bulletin on Variable Stars. 2259: 1. Bibcode: 1983IBVS.2259....1F.
  15. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN  978-986-7332-25-7.
  16. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
Retrieved from " https://en.wikipedia.org/?title=Delta_Eridani&oldid=1237048244"
From Wikipedia, the free encyclopedia
(Redirected from Rana (star))
δ Eridani
Location of δ Eridani (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Eridanus
Right ascension 03h 43m 14.90088s [1]
Declination –09° 45′ 48.2084″ [1]
Apparent magnitude (V) 3.51 - 3.56 [2]
Characteristics
Evolutionary stage Subgiant
Spectral type K0 IV [3]
U−B color index +0.69 [4]
B−V color index +0.92 [4]
Variable type Suspected RS CVn [2]
Astrometry
Radial velocity (Rv)−6.28±0.09 [5] km/s
Proper motion (μ) RA: −93.16 [1]  mas/ yr
Dec.: +743.64 [1]  mas/ yr
Parallax (π)110.61 ± 0.29  mas [1]
Distance29.49 ± 0.08  ly
(9.04 ± 0.02  pc)
Absolute magnitude (MV)3.77 [6]
Details [7]
Mass1.33±0.07 [8]  M☉
Radius2.35±0.01  R☉
Luminosity3.17±0.09  L☉
Surface gravity (log g)3.66±0.1  cgs
Temperature5,027±48  K
Metallicity [Fe/H]+0.07±0.03  dex
Rotational velocity (v sin i)0.7±0.6 [8] km/s
Age6.194 [9]  Gyr
Other designations
Rana, δ Eridani, 23 Eridani, del Eri, NSV 1246, BD−10°728, GJ 150, HD 23249, HIP 17378, HR 1136, SAO 130686, LHS 1581 [10]
Database references
SIMBAD data

Delta Eridani, which is Latinized from δ Eridani, is the fifth-brightest star in the constellation of Eridanus.

The star is visible to the naked eye and has been observed to vary slightly in brightness between magnitudes 3.51 and 3.56, [2] although subsequent observations did not bear this out. [11] It is relatively near to the Sun, with a distance of about 29.5  light years as determined from parallax. [1] The star is drifting closer with a radial velocity of −6 km/s. [5]

Delta Eridani is sometimes called Rana: [12] Rana means "the frog" in Latin, but derivation of this name is uncertain. The name was approved by the International Astronomic Union on 4 April 2022. [13]

Structure

The stellar classification of this star is K0 IV, [3] matching a subgiant star that has exhausted its core hydrogen. This has caused the star to expand and become cooler than a comparable main sequence star. Stellar modelling indicates it is near the end of the subgiant stage and about to transition into a giant. It is an estimated six [9] billion years old with 33% more mass than the Sun. [8] The star has 2.35 times the size of the Sun and is radiating three times the Sun's luminosity from its photosphere at an effective temperature of 5,022 K. [7]

Delta Eridani is catalogued as a suspected RS Canum Venaticorum variable in 1983, [14] but the activity level for the star is so low that this is considered doubtful. This class of variables occurs in close binary systems. A low projected rotational velocity of under 1 km/s and the lack of radial velocity variation suggests that this putative variable is being viewed from nearly pole-on. However, an examination of the star using interferometry does not detect the presence of a companion at the expected distance. [9]

Chinese name

In Chinese, 天苑 (Tiān Yuàn), meaning Celestial Meadows, refers to an asterism consisting of δ Eridani, γ Eridani, π Eridani, ε Eridani, ζ Eridani, η Eridani, π Ceti, τ1 Eridani, τ2 Eridani, τ3 Eridani, τ4 Eridani, τ5 Eridani, τ6 Eridani, τ7 Eridani, τ8 Eridani and τ9 Eridani. [15] Consequently, the Chinese name for δ Eridani itself is 天苑三 (Tiān Yuàn sān, English: the Third Star of Celestial Meadows.) [16]

See also

References

  1. ^ a b c d e f van Leeuwen, F. (2007). "HIP 17378". Hipparcos, the New Reduction. Retrieved 2009-12-11.
  2. ^ a b c Samus', N. N; et al. (2017). "General catalogue of variable stars". Astronomy Reports. GCVS 5.1. 61 (1): 80. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. S2CID  125853869.
  3. ^ a b Spinrad, Hyron; Taylor, Benjamin J. (1969). "Scanner Abundance Studies. I. an Investigation of Supermetallicity in Late-Type Evolved Stars". Astrophysical Journal. 157: 1279. Bibcode: 1969ApJ...157.1279S. doi: 10.1086/150154.
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
  5. ^ a b Jofré, E.; et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv: 1410.6422. Bibcode: 2015A&A...574A..50J. doi: 10.1051/0004-6361/201424474. S2CID  53666931.
  6. ^ Pizzolato, N.; et al. (September 2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics. 361: 614–628. Bibcode: 2000A&A...361..614P.
  7. ^ a b Rains, Adam D.; et al. (April 2020). "Precision angular diameters for 16 southern stars with VLTI/PIONIER". Monthly Notices of the Royal Astronomical Society. 493 (2): 2377–2394. arXiv: 2004.02343. Bibcode: 2020MNRAS.493.2377R. doi: 10.1093/mnras/staa282.
  8. ^ a b c Bruntt, H.; et al. (July 2010). "Accurate fundamental parameters for 23 bright solar-type stars". Monthly Notices of the Royal Astronomical Society. 405 (3): 1907–1923. arXiv: 1002.4268. Bibcode: 2010MNRAS.405.1907B. doi: 10.1111/j.1365-2966.2010.16575.x. S2CID  118495267.
  9. ^ a b c Thévenin, F.; et al. (June 2005). "VLTI/VINCI diameter constraints on the evolutionary status of δ Eri, ξ Hya, η Boo". Astronomy and Astrophysics. 436 (1): 253–262. arXiv: astro-ph/0501420. Bibcode: 2005A&A...436..253T. doi: 10.1051/0004-6361:20042075. S2CID  118169489.
  10. ^ "Del Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-11.
  11. ^ Eaton, J. A.; Poe, C. H. (April 1985). "Limits on the Variability of epsilon Eridani and delta Eridani". Information Bulletin on Variable Stars. 2712: 1. Bibcode: 1985IBVS.2712....1E.
  12. ^ Bečvář, A. (1951). Atlas Coeli Skalnaté Pleso II - Katalog 1950.0. Přírodovědecké Vydavatelstrí. p. 277. Retrieved 27 May 2019.
  13. ^ "Naming Stars".
  14. ^ Fisher, G. F.; et al. (January 1983). "Delta Eridani: a Very Bright New Variable Star". Information Bulletin on Variable Stars. 2259: 1. Bibcode: 1983IBVS.2259....1F.
  15. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN  978-986-7332-25-7.
  16. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
Retrieved from " https://en.wikipedia.org/?title=Delta_Eridani&oldid=1237048244"

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