Chi Lupi (Chi Lup, χ Lupi, χ Lup) is a
spectroscopic binary star in the
constellation of
Lupus.
It has an
apparent visual magnitude
Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's lig ...
of approximately 3.957.
The primary star in the binary is a
mercury-manganese star
A mercury-manganese star (also HgMn star) is a type of chemically peculiar star with a prominent spectral line at 398.4 nm, due to absorption from ionized mercury. These stars are of spectral type B8, B9, or A0, corresponding to surface tempera ...
of spectral type B9.5V; the secondary is a
metallic-lined star of type A2Vm.
This system is a
proper motion member of the Upper Scorpius sub-group in the
Scorpius–Centaurus OB association,
the nearest such co-moving association of massive stars to the Sun.
[
The Upper Scorpius subgroup contains thousands of stars with an average age of 11 million years old at mean distances of 145 ]parsec
The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (au), i.e. . The parsec unit is obtained by the use of parallax and trigonometry, an ...
s (470 light years).
References
{{Stars of Lupus
Lupus (constellation)
B-type main-sequence stars
A-type main-sequence stars
141556
Lupi, Chi
Lupi, 5
077634
Spectroscopic binaries
Upper Scorpius
5883
Durchmusterung objects