Epsilon Eridani

Epsilon Eridani (ε Eri, ε Eridani), Eridanus takımyıldızında yer alan bir yıldızdır.

Epsilon Eridani

Epsilon Eridani'nin Eridanus takımyıldızındaki konumu.
Gözlem verisi
Dönem J2000.0
Takımyıldız Eridanus
Bahar açısı (α) 03s 32d 55.84496sn[1]
Yükselim (δ) −09° 27′ 29.7312″[1]
Görünür parlaklık  (V) 3.736[2]
Sınıflandırma
Tayfsal sınıf
K2V[3]
U-B Renk ölçeği +0.571[2]
B-V Renk ölçeği +0.887[2]
Değişen yıldız türü BY Dra[4][5]
Gökölçümsel nitelikleri
Dikey hız (Rv) +15.5 ± 0.9[6] km/sn
Iraklık açısı (π) =311.37 ± 0.1[7] mys
Uzaklık10.475 ± 0.003 Iy
(3.212 ± 0.001 pc)
mutlak parlaklık (V) 6.19[8]
Özdevinim nitelikleri
Bahar açısı payı (μ) −975.17[1] mys/y
Yükselim payı (μ) 19.49[1] mys/y
Fiziksel özellikler
Kütle (m) 0.82 ± 0.02[9][10] M⊙
Yarıçap (r) 0.735 ± 0.005[11] R⊙
Aydınlatma gücü 0.34[12] L⊙
Etkin sıcaklık 5,084 ± 5.9[13] K
Metallik [Fe/H] −0.13 ± 0.04[14]
Dönüş 11.2 gün[15]
Dönme hızı (v sin i) 2.4 ± 0.5[15] km/sn
Tahmini yaş 400−800[16] y
Katalog belirtmeleri
Ran, 18 Eridani, BD -09°697, GCTP 742.00, GJ 144, HD 22049, HIP 16537, HR 1084, LHS 1557, SAO 130564, WDS 03330-0928.[4]

Ayrıca bakınız

Kaynakça
  1. van Leeuwen, Floor (Kasım 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2), ss. 653-664, arXiv:0708.1752v1 $2, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. Note: see VizieR catalogue I/311 5 Aralık 2012 tarihinde Archive.is sitesinde arşivlendi.
  2. Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8 (59), Bibcode:1984SAAOC...8...59C.
  3. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (Temmuz 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1), ss. 161-170, arXiv:astro-ph/0603770 $2, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. "V* eps Eri – variable of BY Dra type", Centre de Données astronomiques de Strasbourg, SIMBAD, erişim tarihi: 15 Nisan 2016.
  5. "GCVS query=eps Eri", General Catalog of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia, erişim tarihi: 15 Nisan 2016.
  6. Evans, D. S.; Batten, Alan Henry; Heard, John Frederick (20–24 Haziran 1966), "The revision of the general catalogue of radial velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, International Astronomical Union, 30, s. 57, Bibcode:1967IAUS...30...57E.
  7. Benedict, G. Fritz; McArthur, Barbara E.; Gatewood, George; Nelan, Edmund; Cochran, William D.; Hatzes, Artie; Endl, Michael; Wittenmyer, Robert; Baliunas, Sallie L.; Walker, Gordon A. H.; Yang, Stephenson; Kürster, Martin; Els, Sebastian; Paulson, Diane B. (Kasım 2006), "The extrasolar planet e Eridani b – orbit and mass", The Astronomical Journal, 132 (5), ss. 2206-2218, arXiv:astro-ph/0610247 $2, Bibcode:2006AJ....132.2206B, doi:10.1086/508323.
  8. Staff (8 Haziran 2007), The one hundred nearest star systems, Research Consortium On Nearby Stars, 12 Kasım 2007 tarihinde kaynağından arşivlendi, erişim tarihi: 15 Nisan 2016
  9. Gonzalez, G.; Carlson, M. K.; Tobin, R. W. (Nisan 2010), "Parent stars of extrasolar planets – X. Lithium abundances and v sini revisited", Monthly Notices of the Royal Astronomical Society, 403 (3), ss. 1368-1380, arXiv:0912.1621 $2, Bibcode:2010MNRAS.403.1368G, doi:10.1111/j.1365-2966.2009.16195.x. See table 3.
  10. Baines, Ellyn K.; Armstrong, J. Thomas (2011), "Confirming Fundamental Parameters of the Exoplanet Host Star epsilon Eridani Using the Navy Optical Interferometer", The Astrophysical Journal, cilt 748, s. 72, arXiv:1112.0447 $2, Bibcode:2012ApJ...748...72B, doi:10.1088/0004-637X/748/1/72.
  11. Demory, B.-O.; Ségransan, D.; Forveille, T.; Queloz, D.; Beuzit, J.-L.; Delfosse, X.;; di Folco, E.; Kervella, P.; Le Bouquin, J.-B.; Perrier, C.; Benisty, M.; Duvert, G.; Hofmann, K.-H.; Lopez, B.; Petrov, R. (Ekim 2009), "Mass-radius relation of low and very low-mass stars revisited with the VLTI", Astronomy and Astrophysics, 505 (1), ss. 205-215, arXiv:0906.0602 $2, Bibcode:2009A&A...505..205D, doi:10.1051/0004-6361/200911976. See Table B.1
  12. Saumon, D.; Hubbard, W. B.; Burrows, A.; Guillot6, T.; Lunine, J. I.; Chabrier, G. (Nisan 1996), "A theory of extrasolar giant planets", The Astrophysical Journal, cilt 460, s. 993, arXiv:astro-ph/9510046 $2, Bibcode:1996ApJ...460..993S, doi:10.1086/177027. See Table A1, p. 21.
  13. Kovtyukh, V. V.; Soubiran, C.; Belik, S. I.; Gorlova, N. I. (Aralık 2003), "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios", Astronomy and Astrophysics, 411 (3), ss. 559-564, arXiv:astro-ph/0308429 $2, Bibcode:2003A&A...411..559K, doi:10.1051/0004-6361:20031378.
  14. Santos, N. C.; Israelian, G.; Mayor, M. (Mart 2004), "Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation", Astronomy and Astrophysics, 415 (3), ss. 1153-1166, arXiv:astro-ph/0311541 $2, Bibcode:2004A&A...415.1153S, doi:10.1051/0004-6361:20034469.—the percentage of iron is given by , or 74%
  15. Fröhlich, H.-E. (Aralık 2007), "The differential rotation of Epsilon Eri from MOST data", Astronomische Nachrichten, 328 (10), ss. 1037-1039, arXiv:0711.0806 $2, Bibcode:2007AN....328.1037F, doi:10.1002/asna.200710876.
  16. Janson, Markus; Quanz, Sascha P.; Carson, Joseph C.; Thalmann, Christian; Lafrenière, David; Amara, Adam (Şubat 2015), "High-contrast imaging with Spitzer: deep observations of Vega, Fomalhaut, and ε Eridani", Astronomy & Astrophysics, cilt 574, s. 10, arXiv:1412.4816 $2, Bibcode:2015A&A...574A.120J, doi:10.1051/0004-6361/201424944, A120.

Dış bağlantılar

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