Theta1 Crucis

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θ1 Crucis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crux
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.30[2]
Characteristics
Spectral type A3(m)A8-A8[3]
U−B Template:Engvar +0.03[2]
B−V Template:Engvar +0.28[2]
Astrometry
Radial velocity (Rv)−2.4[4] km/s
Proper motion (μ) RA: −152.35[1] mas/yr
Dec.: +7.00[1] mas/yr
Parallax (π)13.88±0.15 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.29[5]
Orbit[6]
Period (P)24.4828 d
Eccentricity (e)0.61
Periastron epoch (T)2419453.3470 JD
Argument of periastron (ω)
(secondary)		358.9°
Semi-amplitude (K1)
(primary)		46.1 km/s
Semi-amplitude (K2)
(secondary)		56.1 km/s
Details
Mass1.57[7] Template:Solar mass
Luminosity81[8] Template:Solar luminosity
Surface gravity (log g)3.76[7] cgs
TemperatureScript error: No such module "val".[7] K
Age1.1[7] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
θ1 Cru, CPD−62°2543, HD 104671, HIP 58758, HR 4599, SAO 251705[9]
Database references
SIMBADdata

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Theta1 Crucis (θ1 Cru, Theta1 Crucis) is a spectroscopic binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent visual magnitude of 4.30m.[2] The distance to this star, as determined using parallax measurements,[1] is around 235 light years.

The pair orbit each other closely with a period of 24.5 days and an eccentricity of 0.61.[6] The primary component is an Am star, which is a chemically peculiar A-type star that shows anomalous variations in absorption lines of certain elements.[10] It has a stellar classification of A3(m)A8-A8.[3] With a mass 157% times that of the Sun,[7] it radiates 81[8] times the Sun's luminosity from its outer atmosphere at an effective temperature of 7341 K.[7] Unusually for a fully radiative A-type star, X-ray emissions have been detected, which may instead be coming from the orbiting companion.[11]

References

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

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Template:Stars of Crux

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