Epsilon Columbae

In today's article we are going to delve into the topic of Epsilon Columbae, an issue that has generated debate and controversy in recent times. Epsilon Columbae is an issue that affects a wide spectrum of society, from professionals in various areas to ordinary people who face challenges related to this issue in their daily lives. In this article we will explore different perspectives and approaches related to Epsilon Columbae, with the aim of shedding light on its implications and offering a comprehensive view of this issue. Regardless of your level of experience or prior knowledge about Epsilon Columbae, through this article you will find relevant and valuable information that will allow you to better understand this issue and its possible implications in various areas. Read on to delve into the fascinating and complex world of Epsilon Columbae!

ε Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 31m 12.74899s[1]
Declination −35° 28′ 13.8605″[1]
Apparent magnitude (V) 3.87[2]
Characteristics
Spectral type K1 II/III[3] or K1 IIIa[4]
U−B color index +1.08[2]
B−V color index +1.14[2]
Astrometry
Radial velocity (Rv)−4.9[5] km/s
Proper motion (μ) RA: +26.421[1] mas/yr
Dec.: −30.085[1] mas/yr
Parallax (π)12.4610±0.2423 mas[1]
Distance262 ± 5 ly
(80 ± 2 pc)
Absolute magnitude (MV)−0.67[6]
Details
Mass2.47[7] M☉
Radius25.2+3.1
−2.0[1] R☉
Luminosity251.2±5.6[1] L☉
Surface gravity (log g)2.05[4] cgs
Temperature4,575+195
−260[1] K
Metallicity −0.03[4] dex
Age1.53[7] Gyr
Other designations
ε Col, CD−35° 2348, FK5 2413, HD 36597, HIP 25859, HR 1862, SAO 195924[8]
Database references
SIMBADdata

Epsilon Columbae, Latinized from ε Columbae, is a star in the southern constellation of Columba. It is visible to the naked eye, having an apparent visual magnitude of 3.87.[2] Based upon an annual parallax shift of 12.46 mas,[1] it is located approximately 262 light years distant from the Sun. The star is drifting closer with a radial velocity of −5 km/s.[5]

This is an orange-hued[9] K-type giant star with a stellar classification of K1 II/III.[3] At the age of 1.5[7] billion years old, it has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. Epsilon Columbae has 2.5[7] times the mass and 25[1] times the radius of the Sun. The star radiates 251 times the solar luminosity from its enlarged photosphere at an effective temperature of 4,575 K.[1] It has a peculiar velocity of 30.0±3.9 km/s, making it a candidate runaway star system.[10] Based upon changes in the star's movement, it has an orbiting stellar companion of unknown type.[11]

References

  1. ^ a b c d e f g h i j k Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. ^ a b Houk, Nancy (1982), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  4. ^ a b c Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  5. ^ a b Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  7. ^ a b c d Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
  8. ^ "eps Col". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-22.{{cite web}}: CS1 maint: postscript (link)
  9. ^ Kambic, Bojan (2009), Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 260, ISBN 978-0387853550.
  10. ^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (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, S2CID 14878976.