Theta Cassiopeiae
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Theta Cassiopeiae or θ Cassiopeiae is a solitary[1] star in the northern constellation of Cassiopeia. It shares the traditional name Marfak Template:IPAc-en with μ Cassiopeiae, positioned less than half a degree to the WSW,[2] which is derived from the Arabic term Al Marfik or Al Mirfaq (المرفق), meaning "the elbow".[3] At an apparent visual magnitude of 4.3,[4] Theta Cassiopeiae is visible to the naked eye. Based upon an annual parallax shift of 24.42 mas,[5] it is located about 134 light years from the Sun. It has a total annual proper motion of 0.227 arcseconds per year,[6] and is slowly drifting further away from the Sun with a radial velocity of 2.5 km/s.[7]
In Chinese, Template:Lang (Template:Lang), meaning Flying Corridor, refers to an asterism consisting of θ Cassiopeiae, ι Cassiopeiae, ε Cassiopeiae, δ Cassiopeiae, ν Cassiopeiae and ο Cassiopeiae.[8] Consequently, θ Cassiopeiae itself is known as Template:Lang (Template:Lang, Template:Langx.)[9]
This is an A-type main sequence star with a stellar classification of A7 V.[1] The measured angular diameter of this star is Template:Val,[10] which, at the estimated distance of this star, yields a physical size of about 2.6 times the radius of the Sun.[11] It is about 650[12] million years in age and is spinning with a projected rotational velocity of 103 km/s.[13] This is a candidate Vega-type system, which means it displays an infrared excess suggesting it has an orbiting debris disk.[14] It is a suspected Delta Scuti variable.[15]
The star appears to be a member of a leading tidal tail of the Hyades cluster.[16]
References
External links
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- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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