Astronomy:HR 3407
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 08h 34m 43.59703s[1] |
| Declination | −49° 56′ 39.1359″[1] |
| Apparent magnitude (V) | 5.01[2] |
| Characteristics | |
| Evolutionary stage | Giant star[3] |
| Spectral type | K1.5Ib[4] |
| U−B color index | +1.38[2] |
| B−V color index | +1.33[2] |
| Variable type | microvariable[5] |
| 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 |
| Distance | 1,040 ± 50 ly (320 ± 20 pc) |
| Absolute magnitude (MV) | –2.06[6] |
| Details | |
| Mass | 3.3±1.1[3] M☉ |
| Radius | 56[7] R☉ |
| Luminosity | 1,010±131[3] L☉ |
| Surface gravity (log g) | 2.0[8] cgs |
| Temperature | 4,245[3] K |
| Metallicity [Fe/H] | −0.4[8] dex |
| Rotational velocity (v sin i) | 4.1[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 star has stellar classification of K1.5Ib,[4] which would suggest it is a supergiant, but is actually a giant star according to modern studies.[3] It has about three times the mass of the Sun[3] and has expanded to around 56 times the Sun's radius.[7] The latter is equivalent to 0.26 astronomical unit|AU. 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.[5] It is radiating around 1,010 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,245 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Hoffleit, D.; Warren, W. H. (1995), "Bright Star Catalogue", VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050, Bibcode: 1995yCat.5050....0H.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 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, doi:10.1086/528936, Bibcode: 2008ApJ...674L..53S.
- ↑ 4.0 4.1 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, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society 331 (1): 45–59, doi:10.1046/j.1365-8711.2002.05150.x, Bibcode: 2002MNRAS.331...45K.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society 471: 770–791, doi:10.1093/mnras/stx1433, ISSN 0035-8711, Bibcode: 2017MNRAS.471..770M HR 3407's database entry at VizieR.
- ↑ 8.0 8.1 8.2 8.3 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, doi:10.1051/0004-6361:20053485, Bibcode: 2006A&A...450.1173L, https://repositorio.ufrn.br/bitstream/123456789/29002/1/LithiumAbundancesAndRotationalBehavior_2006.pdf.
- ↑ 9.0 9.1 "C Vel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=C+Vel.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
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