HR 465
Encyclopedia
GY Andromedae (GY And) is an α2 Canum Venaticorum type
variable star
in the constellation
Andromeda
. Its brightness fluctuates between 6.27m and 6.41m. It belongs to the group of chemically peculiar star
s (CP stars). Its most striking characteristic is the occurrence of the element promethium
in its emission spectrum
.
It is also a spectroscopic binary star with a period of almost 273 days and an eccentricity of 0.47.
Alpha2 Canum Venaticorum variable
An Alpha2 Canum Venaticorum variable is a type of variable star. These stars are chemically peculiar main sequence stars of spectral class B8p to A7p. They have strong magnetic fields and strong silicon, strontium, or chromium spectral lines...
variable star
Variable star
A star is classified as variable if its apparent magnitude as seen from Earth changes over time, whether the changes are due to variations in the star's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth...
in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Andromeda
Andromeda (constellation)
Andromeda is a constellation in the northern sky. It is named after Andromeda, the princess in the Greek legend of Perseus who was chained to a rock to be eaten by the sea monster Cetus...
. Its brightness fluctuates between 6.27m and 6.41m. It belongs to the group of chemically peculiar star
Peculiar star
In astrophysics, peculiar stars have distinctly unusual metal abundances, at least in their surface layers.Chemically peculiar stars are common among hot main sequence stars...
s (CP stars). Its most striking characteristic is the occurrence of the element promethium
Promethium
Promethium is a chemical element with the symbol Pm and atomic number 61. It is notable for being the only exclusively radioactive element besides technetium that is followed by chemical elements with stable isotopes.- Prediction :...
in its emission spectrum
Emission spectrum
The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted by the element's atoms or the compound's molecules when they are returned to a lower energy state....
.
It is also a spectroscopic binary star with a period of almost 273 days and an eccentricity of 0.47.
External links
- Astronomie: Die Sterne - Special Stars: GY Andromedae
- Aladin previewer - Image V* GY And
