Alpha Lyncis
Template:Location mark Location of α Lyncis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.14[2] |
| Characteristics | |
| Evolutionary stage | Giant star |
| Spectral type | K7 III[3] |
| U−B Template:Engvar | +1.95[4] |
| B−V Template:Engvar | +1.55[4] |
| Astrometry | |
| Radial velocity (Rv) | 37.15[5] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 14.7±0.18 mas[1] |
| Distance | Script error: No such module "val". ly (Script error: No such module "val". pc)[6] |
| Absolute bolometric magnitude (Mbol) | –2.32 ± 0.13[7] |
| Details | |
| Mass | Script error: No such module "val".[8] Template:Solar mass |
| Radius | Script error: No such module "val".[9] Template:Solar radius |
| Luminosity | Script error: No such module "val".[8] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | Script error: No such module "val".[8] dex |
| Rotational velocity (v sin i) | 6.4[5] km/s |
| Age | 1.4[10] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| 40 Lyncis, HR 3705, HD 80493, BD+35°1979, HIP 45860, SAO 61414, FK5 352, NSV 4456, GC 12880[11] | |
| Database references | |
| SIMBAD | data |
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Alpha Lyncis (α Lyn, α Lyncis) is the brightest star in the northern constellation of Lynx with an apparent magnitude of +3.13.[4] Unusually, it is the only star in the constellation that has a Bayer designation.[10] Based upon parallax measurements, this star is located about Script error: No such module "convert". from the Earth.[1]
Characteristics
This is a red giant star that has exhausted the hydrogen at its core and has evolved away from the main sequence. It has expanded to about 58 times the Sun's radius[9] and it is emitting roughly 621 times the luminosity of the Sun. The estimated effective temperature of the star's outer envelope is 3,881 K,[8] which is lower than the Sun's effective temperature of 5,778 K, and is giving Alpha Lyncis a red-orange hue that is characteristic of late K-type stars.[12]
Alpha Lyncis is a suspected small-amplitude red variable star[13] that changes apparent magnitude from +3.17 up to +3.12.[14] This variability pattern typically occurs in stars that have developed an inert carbon core surrounded by a helium-fusing shell, and suggests that Alpha Lyncis is starting to evolve into a Mira variable.[10]
References
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- ↑ a b c d e Template:Cite DR3
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- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1". Data about this star can be seen here.
- ↑ Script error: No such module "Citation/CS1". For Mbol, see Table 1.
- ↑ a b c d e f Script error: No such module "Citation/CS1". Alpha Lyncis' database entry at VizieR.
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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