Delta Andromedae
Encyclopedia
Delta Andromedae (δ And, δ Andromedae) is a binary star
system in the constellation
Andromeda
. It is approximately 101 light years
from the Earth
. Apart from its Bayer designation
, it was also given the title Delta by Elijah H. Burritt in his star atlas.
In Chinese
, , meaning Legs
(asterism), refers to an asterism consisting of δ Andromedae, η Andromedae, ζ Andromedae
, ι Piscium
, ε Andromedae
, π Andromedae
, ν Andromedae
, μ Andromedae
, σ Piscium, β Andromedae
, τ Piscium, 91 Piscium, υ Piscium
, φ Piscium
, χ Piscium and ψ1 Piscium. Consequently, δ Andromedae itself is known as
This is a long-period spectroscopic binary with an orbital period of approximately 15,000 days (41 years) and an overall apparent visual magnitude of approximately 3.28. The primary of the spectroscopic binary is a K-type
giant
. The secondary is believed to be relatively faint, as it has not yet been observed interferometrically. It may be either a main-sequence star of spectral type G or later, or a white dwarf
. An excess of infrared
radiation from δ Andromedae suggests that it is surrounded by a shell of dust.
Binary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
system 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...
. It is approximately 101 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from the Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. Apart from its Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
, it was also given the title Delta by Elijah H. Burritt in his star atlas.
In Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Legs
Legs (Chinese constellation)
The Legs mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the White Tiger.-Asterisms:...
(asterism), refers to an asterism consisting of δ Andromedae, η Andromedae, ζ Andromedae
Zeta Andromedae
Zeta Andromedae is a star system in the constellation Andromeda. It is approximately 181 light years from Earth....
, ι Piscium
Iota Piscium
Iota Piscium is a star 45 light years away from Earth, in the constellation Pisces. The star is a yellowish dwarf star of spectral type F7V, which is somewhat larger and brighter than our sun, but still within the range considered to have the potential for Earth-like planets. It has a surface...
, ε Andromedae
Epsilon Andromedae
Epsilon Andromedae is a G-type giant star in the constellation of Andromeda. It has an apparent visual magnitude of approximately 4.37....
, π Andromedae
Pi Andromedae
Pi Andromedae is a spectroscopic binary in the constellation Andromeda. It is approximately 660 light years from Earth....
, ν Andromedae
Nu Andromedae
Nu Andromedae is a binary star in the constellation Andromeda. It is approximately 680 light years from Earth.Nu Andromedae is spectroscopic binary whose components are a blue-white B-type main sequence dwarf and a yellow-white F-type main sequence dwarf...
, μ Andromedae
Mu Andromedae
Mu Andromedae is a star in the constellation Andromeda. It is approximately 136 light years from Earth.Mu Andromedae is a white A-type main sequence dwarf with an apparent magnitude of +3.86.-References:...
, σ Piscium, β Andromedae
Beta Andromedae
Beta Andromedae is a red giant star in the constellation of Andromeda. It has the traditional name Mirach . It has spectral class M0, and is approximately 200 light years away...
, τ Piscium, 91 Piscium, υ Piscium
Upsilon Piscium
Upsilon Piscium is a star approximately 310 light years away from Earth, in the constellation Pisces. It is bluish-white star of the spectral type A3V. It has a surface temperature of 7,500 to 11,000 kelvins, and is approximately the same size as our Sun, yet is much hotter and brighter. It has a...
, φ Piscium
Phi Piscium
Phi Piscium is a binary star system approximately 380 light years away in the constellation Pisces. It consists of Phi Piscium A, with a spectral type of K0III, and Phi Piscium B. Phi Piscium A possesses a surface temperature of 3,500 to 5,000 kelvins...
, χ Piscium and ψ1 Piscium. Consequently, δ Andromedae itself is known as
This is a long-period spectroscopic binary with an orbital period of approximately 15,000 days (41 years) and an overall apparent visual magnitude of approximately 3.28. The primary of the spectroscopic binary is a K-type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
giant
Giant star
A giant star is a star with substantially larger radius and luminosity than a main sequence star of the same surface temperature. Typically, giant stars have radii between 10 and 100 solar radii and luminosities between 10 and 1,000 times that of the Sun. Stars still more luminous than giants are...
. The secondary is believed to be relatively faint, as it has not yet been observed interferometrically. It may be either a main-sequence star of spectral type G or later, or a white dwarf
White dwarf
A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter. They are very dense; a white dwarf's mass is comparable to that of the Sun and its volume is comparable to that of the Earth. Its faint luminosity comes from the emission of stored...
. An excess of infrared
Infrared
Infrared light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.74 micrometres , and extending conventionally to 300 µm...
radiation from δ Andromedae suggests that it is surrounded by a shell of dust.
External links
- The Constellation Andromeda: The Chained Maiden, web page, European Southern ObservatoryEuropean Southern ObservatoryThe European Southern Observatory is an intergovernmental research organisation for astronomy, supported by fifteen countries...
outreach. - Entry at heavens-above.com.
- Image Delta Andromedae