18 Andromedae
Template:Location mark Location of 18 Andromedae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.350[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9 Ve[4] |
| B−V Template:Engvar | −0.110[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −17.222[1] mas/yr Dec.: −1.739[1] mas/yr |
| Parallax (π) | 7.8893±0.1288 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Luminosity | Script error: No such module "val".[3] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[2] cgs |
| Temperature | Script error: No such module "val".[2] K |
| Rotational velocity (v sin i) | 183[3] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
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18 Andromedae, abbreviated 18 And, is a single[7] star in the northern constellation of Andromeda. 18 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.350.[2] The annual parallax shift of Script error: No such module "val".[1] can be used to estimate a distance of 413 light years. It is moving further from the Earth with a heliocentric radial velocity of +10 km/s.[5]
This is a B-type main-sequence star with a stellar classification of B9 Ve,[4] where the 'e' notation indicates this is a Be star. The stellar spectrum of 18 And displays an emission line in the hydrogen Brackett series due to a dense gaseous circumstellar envelope.[4] The star is spinning rapidly with a projected rotational velocity of 183 km/s and has about three times the mass of the Sun. It is radiating 147 times the Sun's luminosity[3] from its photosphere at an effective temperature of 10,351 K.[2]
References
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- ↑ a b c d e f Template:Cite DR2
- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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