Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
A | |
Right ascension | 03h 44m 19.13377s [1] |
Declination | 32° 17′ 17.6874″ [1] |
Apparent magnitude (V) | 3.83 [2] |
B | |
Right ascension | 03h 44m 19.17122s [3] |
Declination | 32° 17′ 18.5103″ [3] |
Apparent magnitude (V) | 6.68 [4] |
Characteristics | |
A | |
Spectral type | B1III / B2V [5] |
U−B color index | -0.75 [2] |
B−V color index | +0.05 [2] |
Variable type | ellipsoidal [6] |
Astrometry | |
Radial velocity (Rv) | +12.20 [7] km/s |
Absolute magnitude (MV) | −4.4 [5] |
A | |
Proper motion (μ) |
RA: +6.091
[1]
mas/
yr Dec.: −9.732 [1] mas/ yr |
Parallax (π) | 3.0224 ± 0.3827 mas [1] |
Distance | approx. 1,100
ly (approx. 330 pc) |
Orbit [5] | |
Primary | Aa |
Companion | Ab |
Period (P) | 4.4191447 days |
Semi-major axis (a) | 33 R☉ |
Eccentricity (e) | 0.0 |
Inclination (i) | 39±15° |
Semi-amplitude (K1) (primary) | 111.8 km/s |
Semi-amplitude (K2) (secondary) | 155.0 km/s |
Details | |
Aa | |
Mass | 14 [8] M☉ |
Radius | 9.6 [5] R☉ |
Surface gravity (log g) | 3.4 [8] cgs |
Temperature | 22,700 [8] K |
Rotational velocity (v sin i) | 70±5 [5] km/s |
Ab | |
Mass | 10 [8] M☉ |
Radius | 8.9 [5] R☉ |
Surface gravity (log g) | 4.0 [8] cgs |
Temperature | 21,000 [8] K |
Rotational velocity (v sin i) | 65±15 [5] km/s |
Age | 15 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during the Hipparcos mission it is approximately 1,100 light-years (330 parsecs) from the Sun.
The system consists of a spectroscopic binary pair designated Omicron Persei A and a third companion Omicron Persei B. [9] A's two components are themselves designated Omicron Persei Aa (officially named Atik /ˈeɪtɪk/, the traditional name of the system) [10] [11] and Ab.
ο Persei ( Latinised to Omicron Persei) is the system's Bayer designation. The designations of the two constituents as Omicron Persei A and B, and those of A's components - Omicron 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). [12]
It bore the traditional name Atik (also Ati, Al Atik), Arabic for "the shoulder". Some sources attribute the name Atik to the nearby, brighter star Zeta Persei. [13] [14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [15] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [16] It approved the name Atik for the component Omicron Persei A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. [11]
In Chinese, 卷舌 (Juǎn Shé), meaning Rolled Tongue, refers to an asterism consisting of Omicron Persei, Nu Persei, Epsilon Persei, Xi Persei, Zeta Persei and 40 Persei. [17] Consequently, the Chinese name for Omicron Persei itself is 卷舌五 (Juǎn Shé wu), "the Fifth Star of Rolled Tongue". [18]
Omicron Persei A is a spectroscopic binary consisting of a spectral type B1 giant and a type B2 dwarf orbiting each other every 4.4 days. The orbit is near-circular although its inclination is not precisely known. The two stars are separated by approximately 33 R☉, the exact value depending on the inclination. The primary is approximately one magnitude brighter than the secondary at visual wavelengths. [5] The binary pair forms a rotating ellipsoidal variable star, which varies in brightness from visual magnitude 3.79 to 3.88 during the orbital period. [20]
Omicron Persei lies just north of the open cluster IC 348, but is not catalogued as a member. Both IC 348 and Omicron Persei belong to the Perseus OB2 association. [21]
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Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
A | |
Right ascension | 03h 44m 19.13377s [1] |
Declination | 32° 17′ 17.6874″ [1] |
Apparent magnitude (V) | 3.83 [2] |
B | |
Right ascension | 03h 44m 19.17122s [3] |
Declination | 32° 17′ 18.5103″ [3] |
Apparent magnitude (V) | 6.68 [4] |
Characteristics | |
A | |
Spectral type | B1III / B2V [5] |
U−B color index | -0.75 [2] |
B−V color index | +0.05 [2] |
Variable type | ellipsoidal [6] |
Astrometry | |
Radial velocity (Rv) | +12.20 [7] km/s |
Absolute magnitude (MV) | −4.4 [5] |
A | |
Proper motion (μ) |
RA: +6.091
[1]
mas/
yr Dec.: −9.732 [1] mas/ yr |
Parallax (π) | 3.0224 ± 0.3827 mas [1] |
Distance | approx. 1,100
ly (approx. 330 pc) |
Orbit [5] | |
Primary | Aa |
Companion | Ab |
Period (P) | 4.4191447 days |
Semi-major axis (a) | 33 R☉ |
Eccentricity (e) | 0.0 |
Inclination (i) | 39±15° |
Semi-amplitude (K1) (primary) | 111.8 km/s |
Semi-amplitude (K2) (secondary) | 155.0 km/s |
Details | |
Aa | |
Mass | 14 [8] M☉ |
Radius | 9.6 [5] R☉ |
Surface gravity (log g) | 3.4 [8] cgs |
Temperature | 22,700 [8] K |
Rotational velocity (v sin i) | 70±5 [5] km/s |
Ab | |
Mass | 10 [8] M☉ |
Radius | 8.9 [5] R☉ |
Surface gravity (log g) | 4.0 [8] cgs |
Temperature | 21,000 [8] K |
Rotational velocity (v sin i) | 65±15 [5] km/s |
Age | 15 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during the Hipparcos mission it is approximately 1,100 light-years (330 parsecs) from the Sun.
The system consists of a spectroscopic binary pair designated Omicron Persei A and a third companion Omicron Persei B. [9] A's two components are themselves designated Omicron Persei Aa (officially named Atik /ˈeɪtɪk/, the traditional name of the system) [10] [11] and Ab.
ο Persei ( Latinised to Omicron Persei) is the system's Bayer designation. The designations of the two constituents as Omicron Persei A and B, and those of A's components - Omicron 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). [12]
It bore the traditional name Atik (also Ati, Al Atik), Arabic for "the shoulder". Some sources attribute the name Atik to the nearby, brighter star Zeta Persei. [13] [14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [15] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [16] It approved the name Atik for the component Omicron Persei A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. [11]
In Chinese, 卷舌 (Juǎn Shé), meaning Rolled Tongue, refers to an asterism consisting of Omicron Persei, Nu Persei, Epsilon Persei, Xi Persei, Zeta Persei and 40 Persei. [17] Consequently, the Chinese name for Omicron Persei itself is 卷舌五 (Juǎn Shé wu), "the Fifth Star of Rolled Tongue". [18]
Omicron Persei A is a spectroscopic binary consisting of a spectral type B1 giant and a type B2 dwarf orbiting each other every 4.4 days. The orbit is near-circular although its inclination is not precisely known. The two stars are separated by approximately 33 R☉, the exact value depending on the inclination. The primary is approximately one magnitude brighter than the secondary at visual wavelengths. [5] The binary pair forms a rotating ellipsoidal variable star, which varies in brightness from visual magnitude 3.79 to 3.88 during the orbital period. [20]
Omicron Persei lies just north of the open cluster IC 348, but is not catalogued as a member. Both IC 348 and Omicron Persei belong to the Perseus OB2 association. [21]
{{
cite book}}
: CS1 maint: multiple names: authors list (
link)