Kappa Scorpii
Template:Location mark Location of κ Sco (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 2.41 - 2.42[2] |
| Characteristics | |
| Spectral type | B1.5 III[3] |
| U−B Template:Engvar | −0.914[4] |
| B−V Template:Engvar | −0.228[4] |
| Variable type | β Cephei[2] |
| Astrometry | |
| Radial velocity (Rv) | −14.0[5] km/s |
| Proper motion (μ) | RA: −6.05[1] mas/yr Dec.: −25.54[1] mas/yr |
| Parallax (π) | 6.75±0.17 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −3.46[6] |
| Orbit[7][note 1] | |
| Period (P) | Script error: No such module "val". days |
| Semi-major axis (a) | Script error: No such module "val". mas |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val".[8] km/s |
| Details | |
| κ Sco A | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | 6.8[8] Template:Solar radius |
| Luminosity | 6,911[6] Template:Solar luminosity |
| Surface gravity (log g) | 4.01[8] cgs |
| Temperature | 23,400[8] K |
| Rotation | 1.90 days[8] |
| Rotational velocity (v sin i) | 105[9] km/s |
| Age | Script error: No such module "val".[10] Myr |
| κ Sco B | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | 5.8[8] Template:Solar radius |
| Surface gravity (log g) | 4.00[8] cgs |
| Temperature | 18,800[8] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | data |
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Kappa Scorpii, Latinized from κ Scorpii, is a binary star system in the southern constellation of Scorpius. With an apparent visual magnitude of 2.4, this star system is readily visible to the naked eye. Parallax measurements place it at an estimated distance of roughly Script error: No such module "convert". from the Earth.
Properties
This is a spectroscopic binary, which is a type of binary star system in which the two stars are so close together that they have not been individually resolved with a telescope. The pair orbit each other with a period of about 195 days and an eccentricity of about 0.5.[7] The combined spectrum of this pair matches a star with a stellar classification of B1.5 III.[3] The 'III' luminosity class indicates the presence of a giant star that has exhausted the supply of hydrogen at its core and is in a late evolutionary stage.
The primary component of the pair, κ Sco A, is a variable star of Beta Cephei type. It is undergoing radial pulsations with a dominant frequency of 4.99922 cycles per day, or 4.8 hours per cycle. There are overlapping secondary pulsation frequencies of about 4.85 and 5.69 cycles per day.[12] This star has about 11 times the mass of the Sun and is nearly 7 times the Sun's radius.[7][8] The effective temperature of the outer envelope is 23,400 K,[8] giving it a blue-white hue. It is rotating rapidly, with an estimated period of only 1.9 days and an axis of rotation that is inclined by about 40° to the line of sight from the Earth.[8]
The secondary component, κ Sco B, is smaller than the primary, but still much larger than the Sun. It has about 10 times the mass of the Sun and nearly six times the Sun's radius.[7][8] The effective temperature of 18,800 K[8] is also higher than the Sun's, which is at 5,778 K.
Traditional name
κ Scorpii has been called Girtab Script error: No such module "IPAc-en".,[13] which is the Sumerian word for 'scorpion'. The name has survived through the Babylonian star catalogues,[14] and was originally applied to an asterism comprising this star, Lambda Scorpii, Upsilon Scorpii, and Iota Scorpii.[13]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Tail, refers to an asterism consisting κ Scorpii, μ1 Scorpii, ε Scorpii, ζ1 Scorpii and ζ2 Scorpii, η Scorpii, θ Scorpii, ι1 Scorpii and ι2 Scorpii, λ Scorpii and υ Scorpii.[15] Consequently, the Chinese name for κ Scorpii itself is Script error: No such module "Lang". (Script error: No such module "Lang".), "the Seventh Star of Tail".[16]
Modern legacy
κ Scorpii appears on the flag of Brazil, symbolising the state of Paraíba.[17]
Notes
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- ↑ from "Fixed Period Only" model
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References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
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- ↑ Script error: No such module "citation/CS1".
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- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Script error: No such module "webarchive"., Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Script error: No such module "citation/CS1".
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External links
- Script error: No such module "citation/CS1".