HR 3407

HR 3407 is a single[10] star in the southern constellation of Vela. It has the Bayer designation C Velorum; HR 3407 is the designation in the Bright Star Catalogue.[9] It is an orange-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.01.[2] The distance to this object is approximately 1,040 light years based on parallax measurements, and it is drifting further away with a radial velocity of 4 km/s.[1]

This article is about C Velorum. For c Velorum, see HD 78004.
HR 3407
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension  08h 34m 43.59703s[1]
Declination –49° 56′ 39.1359″[1]
Apparent magnitude (V) 5.01[2]
Characteristics
Evolutionary stage supergiant
Spectral type K1.5Ib[3]
U−B color index +1.38[2]
B−V color index +1.33[2]
Variable type microvariable[4]
Astrometry
Radial velocity (Rv)4.25±0.17[1] km/s
Proper motion (μ) RA: −14.236±0.322[1] mas/yr
Dec.: 18.540±0.353[1] mas/yr
Parallax (π)3.1501 ± 0.1571[1] mas
Distance1,040 ± 50 ly
(320 ± 20 pc)
Absolute magnitude (MV)–2.06[5]
Details
Mass3.3±1.1[6] M☉
Radius73[7] R☉
Luminosity34.36 - 38.02[7] L☉
Surface gravity (log g)2.0[8] cgs
Temperature3,745±170[7] K
Metallicity [Fe/H]−0.4[8] dex
Rotational velocity (v sin i)4.1[8] km/s
Other designations
C Vel, CD−49°3646, FK5 2674, HD 73155, HIP 42088, HR 3407, SAO 220138[9]
Database references
SIMBADdata

This object is an aging K-type supergiant star with a stellar classification of K1.5Ib.[3] It has about three[6] times the mass of the Sun and has expanded to around 71[1] times the Sun's radius. The latter is equivalent to 0.33 AU, or about one third the distance from the Sun to the Earth. It is spinning with a projected rotational velocity of 4.1.[8] The star displays microvariability with a period of 10.99 cycles per day and an amplitude of 0.0036 in magnitude.[4] It is radiating around 1,600 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,324 K.[1]

References
  1. 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. Hoffleit, D.; Warren, W. H. (1995), "Bright Star Catalogue", VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H (5th Revised ed.), 5050, Bibcode:1995yCat.5050....0H.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins Catalog of Revised MK Types for the Cooler Stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331: 45, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
  5. 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.
  6. Stello, D.; et al. (2008), "Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses", The Astrophysical Journal Letters, 674 (1): L53–L56, arXiv:0801.2155, Bibcode:2008ApJ...674L..53S, doi:10.1086/528936.
  7. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158: 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
  8. Lèbre, A.; de Laverny, P.; Do Nascimento, J. D., Jr.; de Medeiros, J. R. (May 2006), "Lithium abundances and rotational behavior for bright giant stars", Astronomy and Astrophysics, 450 (3): 1173–1179, Bibcode:2006A&A...450.1173L, doi:10.1051/0004-6361:20053485.
  9. "C Vel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-04.
  10. 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.
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