Lambda Aurigae
 Location of λ Aurigae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 19m 08.47420s[1] |
| Declination | +40° 05′ 56.5826″[1] |
| Apparent magnitude (V) | 4.71[2] |
| Characteristics | |
| Spectral type | G1 V[3] |
| U−B color index | +0.13[2] |
| B−V color index | +0.62[2] |
| R−I color index | 0.32 |
| Astrometry | |
| Radial velocity (Rv) | 66.5[4] km/s |
| Proper motion (μ) | RA: +518.99±0.26[1] mas/yr Dec.: −665.06±0.13[1] mas/yr |
| Parallax (π) | 79.17 ± 0.28[1] mas |
| Distance | 41.2 ± 0.1 ly (12.63 ± 0.04 pc) |
| Details | |
| Mass | 1.081+0.054 −0.029[5] M☉ |
| Radius | 1.331±0.021[3] R☉ |
| Luminosity | 1.732±0.022[3] L☉ |
| Surface gravity (log g) | 4.02[6] cgs |
| Temperature | 5890±4.3[7] K |
| Metallicity [Fe/H] | +0.01[6] dex |
| Rotational velocity (v sin i) | 2[8] km/s |
| Age | 5.0–7.9[9] Gyr |
| Other designations | |
Lambda Aurigae (λ Aur, λ Aurigae) is the Bayer designation for a solar analog[11] star in the northern constellation of Auriga.[12] It has the traditional name Al Hurr[13] and is visible to the naked eye with an apparent visual magnitude of 4.71.[2] Based upon parallax measurements made during the Hipparcos mission, it is approximately 41.2 light-years (12.6 parsecs) distant from the Earth.[1]
This is a G-type main sequence star with a stellar classification of G1 V.[3] In terms of composition it is similar to the Sun, while the mass and radius are slightly larger.[5] It is 73% more luminous than the Sun[3] and radiates this energy from its outer atmosphere at an effective temperature of 5890 K.[7] At this heat, the star glows with the yellow hue of a G-type star.[14] It has a low level of surface activity and is a candidate Maunder minimum analog.[15]
Lambda Aurigae has been examined for the presence of excess infrared emission that may indicate the presence of a circumstellar disk of dust, but no significant surplus has been observed.[11] It is a possible member of the Epsilon Indi Moving Group of stars that share a common motion through space. The space velocity components of this star are [U, V, W] = [+76, –39, –6] km/s.[16]
Name
This star is sometimes called by the name Al Hurr, meaning the fawn in Arabic.[13] Lambda Aurigae, along with μ Aur and ρ Aur, were Kazwini's Al Ḣibāʽ (ألحباع), the Tent.[13] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Ḣibāʽ were the title for three stars : λ Aur as Al Ḣibāʽ I, μ Aur as Al Ḣibāʽ II and ρ Aur as Al Ḣibāʽ III.[17]
In Chinese, 咸池 (Xián Chí), meaning Pool of Harmony, refers to an asterism consisting of λ Aurigae, ρ Aurigae and HD 36041.[18] Consequently, λ Aurigae itself is known as 咸池三 (Xián Chí sān, English: the Third Star of Pool of Harmony.)[19]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found. Note: see VizieR catalogue I/311.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.. See Table 10.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 11.0 11.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 13.0 13.1 13.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 13 日
