16 Lyrae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.00[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A6 IV[4] or A7 V[5] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: +22.004 mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 25.7832±0.0688 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +2.13[2] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". (equatorial) Script error: No such module "val". (polar) Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | 4.28[7] cgs |
| Temperature | 8,028 (equator) 8,242 (polar) K |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val". Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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16 Lyrae is a suspected astrometric binary[9] star system in the constellation Lyra,[8] located 126 light years away from the Sun based on parallax.[1] It is visible to the naked eye as a dim, white-hued star with a combined apparent visual magnitude of 5.00.[2] The system is moving further away from the Earth with a heliocentric radial velocity of +4.36 km/s.[1] It is a suspected member of the Ursa Major Moving Group stream.[10]
Cowley et al. (1969) found a stellar classification of A7 V[5] for the visible component, matching an A-type main-sequence star that is generating energy through hydrogen fusion at its core. Abt and Morrell (1995) instead listed a class of A6 IV,[4] suggesting it has left the main sequence and become a subgiant star.
16 Lyrae is 72% more massive than the Sun and irradiates 10.5 times the Sun's luminosity. It is 401 million years old with a high rate of spin, showing a projected rotational velocity of 85 km/s. The fast rotation make this star slightly oblate, with an equatorial radius of Template:Solar radius and a polar radius of Template:Solar radius. Its effective temperature also vary across its surface due to rotation, from Script error: No such module "val". in the poles to Script error: No such module "val". in the equator.[6]
This system is a source for X-ray emission with a luminosity of Script error: No such module "val"., which is most likely coming from the unseen companion.[11]
References
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- ↑ a b c d e f g Template:Cite DR3
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- ↑ a b Template:Cite simbad
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