HD 119921
Template:Short description Template:About-distinguish-text
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.15[1] |
| Characteristics | |
| Spectral type | A0 V[3][4] or B9.5 III-n[5] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[6] km/s |
| Proper motion (μ) | RA: −13.293[2] mas/yr Dec.: −11.115[2] mas/yr |
| Parallax (π) | 7.7881±0.2382 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.48[1] |
| Details | |
| Mass | 2.6[7] Template:Solar mass |
| Radius | 4.1[7] Template:Solar radius |
| Luminosity | 160[7] Template:Solar luminosity |
| Surface gravity (log g) | 3.62[7] cgs |
| Temperature | 10,102[7] K |
| Rotational velocity (v sin i) | 220[8] km/s |
| Age | 337[9] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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HD 119921 is a single,[4] white-hued star in the southern constellation of Centaurus. it has the Bayer designation z Centauri. This is faintly visible to the naked eye, having an apparent visual magnitude of 5.15.[1] It forms a wide double star with a faint, magnitude 12.50 visual companion, which is located at an angular separation of Script error: No such module "val". as of 2010.[11] HD 119921 is moving closer to us with a heliocentric radial velocity of around −10 km/s,[6] and is currently located some Script error: No such module "val". from the Sun. At that distance, the visual magnitude of this star is diminished by 0.15 from extinction due to interstellar dust.[9]
This is an A-type main-sequence star with a stellar classification of A0 V, per Houk (1979).[3] However, Gray & Garrison (1987) have it classed as B9.5 III-n, suggesting it is a more evolved giant star.[5] HD 119921 is spinning rapidly with a projected rotational velocity of 220 km/s.[8] The star is radiating around 160 times the Sun's luminosity from its photosphere at an effective temperature of Script error: No such module "val"..[7]
In 1983, Molaro et al. reported the presence of super-ionized elements (triple-ionized carbon and silicon) in the far ultraviolet spectrum of HD 119921. These anomalous features are not normally detected from a star in this temperature range.[12] Instead, these blue-shifted absorption features may originate in the local interstellar medium.[8]
References
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- ↑ a b c d Template:Cite XHIP
- ↑ a b c d e Template:Cite DR2
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- ↑ a b c d e f 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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- ↑ Script error: No such module "citation/CS1".
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