HD 93205

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Template:Short description

HD 93205
Template:Location mark
Location of HD 93205 (circled), southwest of Eta Carinae, the brightest star in the image
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 7.75[2]
Characteristics
Spectral type O3.5Vf + O8V[3]
U−B Template:Engvar −0.91[2]
B−V Template:Engvar +0.05[2]
Variable type Ellipsoidal[4]
Astrometry
Radial velocity (Rv)3.6 km/s
Proper motion (μ) RA: −6.619[1] mas/yr
Dec.: 2.947[1] mas/yr
Parallax (π)0.4308±0.0248 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−5.87 + −4.32[5]
Orbit[6]
Period (P)6.0803 days
Eccentricity (e)0.370
Inclination (i)60[7]°
Semi-amplitude (K1)
(primary)		132.6 km/s
Semi-amplitude (K2)
(secondary)		313.6 km/s
Details
Mass40 - 60[6] Template:Solar mass
Radius9.2[7] Template:Solar radius
Luminosity1,160,000[5] Template:Solar luminosity
Temperature51,300[5] K
secondary
Mass17 - 25.3[6] Template:Solar mass
Radius7.0[7] Template:Solar radius
Luminosity112,000[5] Template:Solar luminosity
Temperature38,000[5] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age< 2[6] Myr
Other designations
V560 Car, CD−59°3294, HD 93205, SAO 238418
Database references
SIMBADdata

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File:V560CarLightCurve.png
Light curve for V560 Carinae, plotted from Hipparcos data[8]

HD 93205, or V560 Carinae, is a binary stellar system, in the Carina Nebula (NGC 3372) in the constellation Carina. It consists of two massive O-stars that revolve around each other in 6 days.

The more massive member of the pair is an O3.5 main sequence star. The spectrum shows some ionised nitrogen and helium emission lines, indicating some mixing of fusion products to the surface and a strong stellar wind. The mass calculated from apsidal motion of the orbits is Template:Solar mass. This is somewhat lower than expected from evolutionary modelling of a star with its observed parameters.[6]

The less massive member is an O8 main sequence star of approximately Template:Solar mass.[7] It moves in its orbit at a speed of over 300 km/s and is considered to be a relativistic binary, which causes the apses of the orbit to change in a predictable way.[5]

In 1985, Arnout van Genderen et al. reported that the star appeared to be "variable in brightness".[9] Eleonora A. Antokhina et al. confirmed the star's variability in the year 2000, and presented an extensive analysis of the light curve.[7] The star was given its variable star designation, V560 Carinae, in 2001.[10] The closeness of the two stars causes them to become deformed, and this means that the observed brightness of the system varies slightly every six days during its orbit. The total amplitude of the variation is only 0.02 magnitudes.[4]

It is generally considered as a member of the open cluster Trumpler 16.[11] Among its neighbors are some of the most massive and luminous stars in the galaxy, like Eta Carinae, HD 93250 and the binary WR 25. It lies five arc-minutes from Eta Carinae.

References

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  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Carina

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