V419 Cephei

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V419 Cephei
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 12m 47.24741s[1]
Declination +60° 05′ 52.8017″[1]
Apparent magnitude (V) +6.62[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M2 Ib[3]
Variable type Lc[4]
Astrometry
Parallax (π)0.63 ± 0.29[1] mas
Distance1,085[5] pc
Absolute magnitude (MV)−5.72[2]
Details
Mass16.6 ± 2.6[6] M
Radius590[2] R
Diameter590[2] D
Luminosity58,000[2] L
Temperature3,700[2] K
Age10.0[6] Myr
Other designations
V419 Cep, HD 202380, HIP 104719, SAO 33232, BD+59°2342, AG+59 1417, GCRV 13343
Database references
SIMBADdata

V419 Cephei (BD + 59 2342 or HIP 104719) is a variable star in the constellation of Cepheus with an average apparent magnitude of 6.62.

Distance[edit]

Given its distance, V419 Cephei's Hipparcos-measured parallax of 0.63 ± 0.29 milliarcseconds is not constrained to evaluate its distance. Its most likely distance is 1085 ± 320 parsecs, equal to 3,540 ± 1,035 light years. It is a member of the stellar association Cepheus OB2-A.

Characteristics[edit]

V419 Cephei is a red supergiant of spectral type M2I with an effective temperature of 3,700 K. It has an estimated radius of 590 R. K-band angular diameter measurements equal 5.90 ± 0.70 milliarcseconds,[7] which leads to a figure not much higher, although the uncertainty in its distance must also be taken into account. Its has a radius of 2.7 AU. If placed at the Sun's location, it would engulf the orbits of Mercury, Venus, Earth, Mars, and roughly half of the asteroid belt. Despite its large size, it is far smaller than the two supergiants known in this constellation, Mu Cephei and VV Cephei A.

V419 Cephei has a mass 16.6 solar masses, above the limit beyond which stars end their lives as supernovae. The life of such massive stars is very short. Despite its advanced evolutionary state, V419 Cephei is only 10 million years old.[6]

Billed as an irregular variable star LC, V419 Cephei's brightness varies by 0.27 magnitude.[4]

References[edit]

  1. 1.0 1.1 1.2 van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics 474 (2): 653–64. arXiv:0708.1752. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 2.0 2.1 2.2 2.3 2.4 Table 4 in Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode 2005ApJ...628..973L. doi:10.1086/430901.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. Bibcode 1989ApJS...71..245K. doi:10.1086/191373.
  4. 4.0 4.1 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.
  5. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters. 405. pp. 165-186. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...430..165F&db_key=AST&nosetcookie=1.
  6. 6.0 6.1 6.2 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410: 190. arXiv:1007.4883. Bibcode 2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  7. Richichi, A.; Percheron, I.; Khristoforova, M. (2005). CHARM2: An updated Catalog of High Angular Resolution Measurements. 431. pp. 773-777. http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ503b33803529&-out.add=.&-source=J/A%2bA/431/773/charm2&recno=2225.


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