Английская Википедия:Epsilon Cephei
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
Epsilon Cephei, Latinized from ε Cephei, is a star in the northern constellation of Cepheus. Based upon an annual parallax shift of 38.17 mas as seen from the Earth,[1] it is located about 85 light years from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 4.18.[2]
Properties
Physical Characteristics
This is a yellow-white hued, F-type star with a stellar classification of Шаблон:Nowrap[3] or F0 IV.[4] Thus it may either be an F-type main sequence star showing an abundance excess of strontium, or it could be a more evolved subgiant star. It is a Delta Scuti variable star that cycles between magnitudes 4.15 and 4.21 every 59.388 minutes.[5] The star displays an infrared excess, indicating the presence of a debris disk with a temperature of 65 K orbiting at a radius of 62 AU. This dust has a combined mass equal to 6.6% of the Earth's mass.[6]
Binary
There is a faint companion star at an angular separation of Шаблон:Val along a position angle of Шаблон:Val. This corresponds to a projected physical separation of Шаблон:Val. The probability of a random star being situated this close to Epsilon Cephei is about one in a million, so it is most likely physically associated. If so, then the debris disk is probably circumbinary. The fact that this companion was not detected during the Hipparcos mission may indicate its orbit has a high eccentricity. The companion star has a K-band magnitude of 7.8 and is probably of class K8–M2.[4]
Naming
In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Flying Serpent, refers to an asterism consisting of ε Cephei, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, the Chinese name for ε Cephei itself is Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en)[7]
References
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- Английская Википедия
- F-type main-sequence stars
- F-type subgiants
- Delta Scuti variables
- Circumstellar disks
- Double stars
- Bayer objects
- Cepheus (constellation)
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
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- Википедия
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