Omega Andromedae
Template:Location mark Location of χ Andromedae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.83[2][3] |
| Characteristics | |
| Spectral type | F5 IVe[4] or F3 V + F5 V[5] |
| U−B Template:Engvar | +0.00[3] |
| B−V Template:Engvar | +0.42[3] |
| Astrometry | |
| Radial velocity (Rv) | +14.7[2] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 34.7332±0.1341 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +2.57[2] |
| Orbit[5] | |
| Period (P) | 254.9 days |
| Semi-major axis (a) | Script error: No such module "val".″ |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Semi-amplitude (K2) (secondary) | Script error: No such module "val". km/s |
| Details | |
| ω And A | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Radius | 2.2[6] Template:Solar radius |
| Luminosity | 7.1[7] Template:Solar luminosity |
| Temperature | 6,628[7] K |
| Metallicity [Fe/H] | −0.16[2] dex |
| Rotational velocity (v sin i) | 57.1[8] km/s |
| Age | 2.1[2] Gyr |
| ω And B | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| 48 Andromedae, BD+44°307, FK5 1040, HD 8799, HIP 6813, HR 417, SAO 37228, PPM 44006[4] | |
| Database references | |
| SIMBAD | data |
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Omega Andromedae (ω And, ω Andromedae) is a binary star system[9] in the northern constellation of Andromeda. Parallax measurements made during the Gaia mission make this system to be approximately Script error: No such module "convert". from Earth. Its apparent visual magnitude is +4.83,[2] which makes it bright enough to be seen with the naked eye.
The primary component has a stellar classification of F5 IVe.[4] The IV luminosity class indicates that it is probably a subgiant star that is in the process of evolving away from the main sequence as the supply of hydrogen at its core depletes. However, Abt (1985) gives a classification of F3 V, suggesting it is an F-type main-sequence star.[5] The measured angular diameter of the primary star is 0.70 ± 0.03 mas.[10] At the system's estimated distance this yields a size of about 2.2 times that of the Sun.[6] It is emitting about seven times solar luminosity from its outer atmosphere at an effective temperature of Script error: No such module "val"..[7] This heat gives it the yellow-white-hued glow of an F-type star.[11]
In 2008, the companion star was resolved using adaptive optics at the Lick Observatory. Later observations showed the magnitude difference between the two stars is 3.65 ± 0.03 and they are separated by 0.669 arcsecond.[9] Abt (1985) lists the class as F5 V.[5]
References
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- ↑ a b c d e Template:Cite Gaia DR3
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- ↑ a b Script error: No such module "citation/CS1".. The radius (R*) is given by:
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