HD 74180

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b Velorum
Template:Location mark
Location of b Vel (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Vela[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 3.81[3]
Characteristics
Evolutionary stage Yellow supergiant or yellow hypergiant
Spectral type F8 Ib,[4] F0Ia+[5] or F0Ia[6]
U−B Template:Engvar +0.34[3]
B−V Template:Engvar +0.67[7]
Variable type suspected α Cyg[5]
Astrometry
Radial velocity (Rv)−25.3[8] km/s
Proper motion (μ) RA: −6.124[9] mas/yr
Dec.: +4.473[9] mas/yr
Parallax (π)0.431±0.101 mas[10]
Distance3,230Template:Snd8,250Template:Efn ly
(990[4]Template:EfnTemplate:Snd2,532[10]Template:Efn pc)
Absolute magnitude (MV)−6.50[4]
Details
Mass12.63[4]–Script error: No such module "val".[11] Template:Solar mass
RadiusTemplate:Solar radius calculator[4]Template:Efn Template:Solar radius
Luminosity34,040[4]Template:Efn Template:Solar luminosity
Surface gravity (log g)1.38[4] cgs
Temperature5,750[4]Template:Snd7,839[12] K
Metallicity [Fe/H]0.56[12] dex
Rotational velocity (v sin i)Script error: No such module "val".[7] km/s
AgeScript error: No such module "val".[11]Template:Efn Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
b Velorum, HR 3445, HD 74180, CD−46°4438, FK5 1226, HIP 42570, SAO 220265
Database references
SIMBADdata

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HD 74180 is a single[13] star in the constellation Vela. It is a yellow-white F-type supergiant with a mean apparent magnitude of +3.81 and a spectral classification F8Ib. Estimates of its distance to Earth vary between 3,200 and 8,300 light-years.

Properties

File:HD74180LightCurve.png
A light curve for HD 74180, adapted from van Leeuwen et al. (1998)[5]

b Velorum has been classified as a suspected α Cygni variable star which varies by only 0.06 magnitude. There are possible periods near 53, 80, and 160 days, but the variation is largely irregular.[5] It lies less than a degree from the small open cluster NGC 2645, but is not a member.[4]

Several studies have considered b Velorum to be a highly luminous supergiant or hypergiant with an early F spectral type, for example F2 Ia+,[5] F0 Ia,[6] and F4 I.[14] There were corresponding luminosity estimates of Template:Solar luminosity. A 2015 study used the Barbier-Chalonge-Divan (BCD) system to derive a luminosity of Template:Solar luminosity and a cooler less luminous F8 Ib spectral type.[4]

Distance and size

Multiple papers give different distances for b Velorum. Bailer-Jones et al. (2021) give a distance of about Script error: No such module "convert"..[10] The Hipparcos spacecraft give a parallax of Script error: No such module "val"., translating into a distance of Script error: No such module "convert"..[2] Aidelman et al. (2015) give a distance of Script error: No such module "convert"..[4] At the Hipparcos distance, bScript error: No such module "String".Velorum has its apparent brightness diminished by 1.11Script error: No such module "String".magnitudes due to interstellar extinction.[12]

b Velorum has an angular diameter estimated at Script error: No such module "val"..[15] The physical size depends on the star's distance, and could be Template:SigfigScript error: No such module "String".Template:Solar radius assuming the distance of Aidelman et al., Template:SigfigScript error: No such module "String".Template:Solar radius assuming the Hipparcos distance, or even Template:SigfigScript error: No such module "String".Template:Solar radius assuming the Bailer-Jones et al. distance.[16]

In chinese astronomy

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Earth God's Temple, refers to an asterism consisting of Kappa Velorum, Gamma2 Velorum, b Velorum and Delta Velorum.[17] Consequently, Kappa Velorum itself is known as Script error: No such module "Lang". (Script error: No such module "Lang".), "the Fifth Star of Celestial Earth God's Temple".[18]

Notes

Template:Notelist

References

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  1. ↑ Template:Cite constellation
  2. ↑ a b c Script error: No such module "Citation/CS1". b Velorum's database entry at VizieR.
  3. ↑ a b Script error: No such module "Citation/CS1".
  4. ↑ a b c d e f g h i j k Script error: No such module "Citation/CS1".
  5. ↑ a b c d e Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1". b Velorum's database entry at VizieR.
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b Template:Cite Gaia DR3
  10. ↑ a b c Script error: No such module "Citation/CS1". Data about this star can be seen here.
  11. ↑ a b Script error: No such module "Citation/CS1". b Velorum's database entry at VizieR.
  12. ↑ a b c Script error: No such module "Citation/CS1". b Velorum's database entry at VizieR.
  13. ↑ Script error: No such module "Citation/CS1". b Velorum's database entry at VizieR.
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".. The radius (R*) is given by:
    2⋅R*=(10−3⋅990⋅1.824) AU0.0046491 AU/R⨀≈388⋅R⨀
    2⋅R*=(10−3⋅1493⋅1.824) AU0.0046491 AU/R⨀≈586⋅R⨀
    2⋅R*=(10−3⋅2530⋅1.824) AU0.0046491 AU/R⨀≈993⋅R⨀
  17. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  18. ↑ Template:In lang 香港太空館 – 研究資源 – 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.

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Template:Stars of Vela

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