49 Andromedae
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Template:Location mark Location of 49 Andromedae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.269[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | K0 III[5] |
| B−V Template:Engvar | 0.993[3] |
| Astrometry | |
| Radial velocity (Rv) | −11.48[3] km/s |
| Proper motion (μ) | RA: −0.950 mas/yr[2] Dec.: −42.638 mas/yr[2] |
| Parallax (π) | 9.7947±0.1166 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.50[1] |
| Details | |
| Mass | 2.07[3] Template:Solar mass |
| Radius | 11[6] Template:Solar radius |
| Luminosity | 70.8[3] Template:Solar luminosity |
| Surface gravity (log g) | 2.30[4] cgs |
| Temperature | Script error: No such module "val".[3] K |
| Metallicity [Fe/H] | Script error: No such module "val".[4] dex |
| Rotational velocity (v sin i) | 2.0[7] km/s |
| Age | 1.75[3] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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49 Andromedae is a star in the constellation Andromeda.[1] 49 Andromedae is the Flamsteed designation (abbreviated 49 And),[8] though it also bears the Bayer designation A Andromedae.[9] It is visible to the naked eye under good viewing conditions with an apparent visual magnitude of 5.269.[3] The distance to 49 Andromedae, as determined from its annual parallax shift of Script error: No such module "val".,[2] is around 333 light-years. It is drifting closer to the Sun with a heliocentric radial velocity of −11.5 km/s.[3]
With an estimated age of Script error: No such module "val".[3] years, this is an aging red-clump[4] giant star with a stellar classification of K0 III,[5] indicating it is generating energy by helium fusion at its core. The spectrum displays "slightly strong" absorption lines of cyanogen (CN).[5] It has 2.07[3] times the mass of the Sun and has expanded to 11[6] times the Sun's radius. The star is radiating 71[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of Script error: No such module "val"..[3] It is spinning with a projected rotational velocity of Script error: No such module "val"..[7]
This was one of the stars historically known as Adhil, from Arabic að-ðayl "the train [of a garment]", a name now applied to ξ Andromedae.[10] In a 1971 NASA technical memorandum listing star names, 49 Andromedae was listed as Thail, likely derived from the same Arabic name.[11]
References
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