Kappa Persei

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Kappa Persei
Perseus IAU.svg
Red circle.svg
Location of κ Persei (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Perseus
Right ascension 03h 09m 29.77156s [1]
Declination +44° 51 27.1463 [1]
Apparent magnitude  (V)3.80 [2]
Characteristics
Spectral type G9.5 IIIb [3]
U−B color index +0.83 [2]
B−V color index +0.98 [2]
Astrometry
Radial velocity (Rv)27.43±0.42 [4]  km/s
Proper motion (μ)RA: +172.99 [1]   mas/yr
Dec.: −143.40 [1]   mas/yr
Parallax (π)28.93 ± 0.21  mas [1]
Distance 112.7 ± 0.8  ly
(34.6 ± 0.3  pc)
Absolute magnitude  (MV)1.20 [5]
Details
Mass 1.50 [6]   M
Radius 9 [4]   R
Luminosity 39.8 [6]   L
Surface gravity (log g)2.9 [4]   cgs
Temperature 4,857±69 [6]   K
Metallicity [Fe/H]0.04 [4]   dex
Rotational velocity (v sin i)3.0 [4]  km/s
Age 4.58 [6]   Gyr
Other designations
Misam, Kap Per, κ Per, 27 Persei, BD+44° 631, HD  19476, HIP  14668, HR  941, SAO  38609, WDS J03095+4451A [7]
Database references
SIMBAD data

Kappa Persei or κ Persei, is a triple star system in the northern constellation of Perseus. Based upon an annual parallax shift of 28.93  mas, [1] it is located at a distance of 113  light-years from the Sun.

Contents

The system consists of a spectroscopic binary, [8] [5] designated Kappa Persei A, which can be seen with the naked eye, having an apparent visual magnitude of 3.80. [2] The third star, designated Kappa Persei B, is of magnitude 13.50. [9]

Kappa Persei A's two components are designated Kappa Persei Aa (officially named Misam /ˈmzəm/ , the traditional name of the entire system) [10] and Ab.

Nomenclature

κ Persei (Latinised to Kappa Persei) is the system's Bayer designation. The designations of the two constituents as Kappa Persei A and B, and those of A's components - Kappa Persei Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). [11]

The traditional name comes from the Arabic مِعْصَم miʽṣam 'wrist'.

In 2016, the IAU organized a Working Group on Star Names (WGSN) [12] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [13] It approved the name Misam for the component Kappa Persei Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. [10]

In Chinese, 大陵 (Dà Líng), meaning Mausoleum , refers to an asterism consisting of Kappa Persei, 9 Persei, Tau Persei, Iota Persei, Beta Persei (Algol), Rho Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for Kappa Persei itself is 大陵四 (Dà Líng sì, English: the Fourth Star of Mausoleum.). [14]

Properties

At its distance, the visual magnitude of Kappa Persei is diminished by an extinction factor of 0.06 due to interstellar dust. [5] It has a relatively high proper motion totaling 0.230  arcseconds per year. [15] There is a 76.3% chance that it is a member of the Hyades-Pleiades stream of stars that share a common motion through space. [5]

With an estimated age of 4.58 billion years, [6] Kappa Persei Aa is an evolved G-type giant star with a stellar classification of G9.5 IIIb. [3] It is a red clump giant, which means that it is generating energy at its core through the nuclear fusion of helium. [16] The star has about 1.5 [6] times the mass of the Sun and 9 [4] times the Sun's radius. It radiates 40 [6] times the solar luminosity from its outer atmosphere at an effective temperature of 4,857 K. [6]

Kappa Persei B is at an angular separation of 44.10 arc seconds along a position angle of 319°, as of 2009. [9]

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<span class="mw-page-title-main">Eta Persei</span> Star system in the constellation Perseus

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References

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