EV Carinae

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EV Carinae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 20m 21.608s[1]
Declination −60° 27′ 15.55″[1]
Apparent magnitude (V) 7.4-9.0[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M4Ia[3]
U−B color index +2.34[4]
B−V color index +2.20[4]
Variable type SRC[5][2][6]
Astrometry
Radial velocity (Rv)2.0[7] km/s
Proper motion (μ) RA: −6.1[8] mas/yr
Dec.: 2.4[8] mas/yr
Parallax (π)0.7759 ± 0.1098[9] mas
Distanceapprox. 4,200 ly
(approx. 1,300 pc)
Absolute magnitude (MV)−5.24[4]
Details
Radius1,168[3] R
Diameter1,168[3] D
Luminosity (bolometric)200,000[3]-240,000[4] (or 675,000[4]L
Temperature3,574[3] K
Other designations
EV Carinae, HD 89845, CD-59°3024, 2MASS J10202160-6027155, TYC 8956-3486-1, AAVSO 1016-59
Database references
SIMBADdata

EV Carinae is a red supergiant and pulsating variable star of spectral type M4Ia in the constellation Carina. It is a probable member of the Carina OB2 association along the Carina Nebula, at a distance of over 8,000 light years.

EV Carinae is one of the largest known stars, with a radius over 1,000 times the Sun, and is also one of the most luminous with 2×105 L.[3][4] If placed at the center of the Solar System, it would extend close to the orbit of Jupiter. Older estimates based on much larger distances have given higher luminosities, and consequently larger radius values.[4]

EV Car is a semiregular variable star with its apparent magnitude varying between 7.4 and 9.0 in the visible band, making it only seen by binoculars or a telescope. Various periods have been identified, but the dominant one is around 347 days.[5]

References[edit]

  1. 1.0 1.1 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C 2246. Bibcode 2003yCat.2246....0C.
  2. 2.0 2.1 Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society 372 (4): 1721. arXiv:astro-ph/0608438. Bibcode 2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x.
  3. 3.0 3.1 3.2 3.3 3.4 Van Loon, J. Th.; Cioni, M.-R. L.; Zijlstra, A. A.; Loup, C. (2005). "An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch stars". Astronomy and Astrophysics 438: 273. arXiv:astro-ph/0504379. Bibcode 2005A&A...438..273V. doi:10.1051/0004-6361:20042555.
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Mauron, N.; Josselin, E. (2011). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy and Astrophysics 526: A156. arXiv:1010.5369. Bibcode 2011A&A...526A.156M. doi:10.1051/0004-6361/201013993.
  5. 5.0 5.1 Samus, N. N.Expression error: Unrecognized word "etal". (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode 2009yCat....102025S.
  6. Percy, John R.; Sato, Hiromitsu (2009). "Long Secondary Periods in Pulsating Red Supergiant Stars". Journal of the Royal Astronomical Society of Canada 103: 11. Bibcode 2009JRASC.103...11P.
  7. Feast, M. W.; Woolley, R.; Yilmaz, N. (1972). "The kinematics of semi-regular red variables in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society 158: 23. Bibcode 1972MNRAS.158...23F. doi:10.1093/mnras/158.1.23.
  8. 8.0 8.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. Bibcode 2000A&A...355L..27H. doi:10.1888/0333750888/2862.
  9. Brown, A. G. A. (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.


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External links[edit]

Thesis on SRC stars

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