Lambda Aurigae
{{Short description|Solar analog star in the constellation Auriga}}
{{Starbox begin
| name = λ Aurigae
}}
{{Starbox image
| image=
{{Location mark
|image=Auriga constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=8|mark_link=λ Aurigae
|x=590|y=443
}}
|caption=Location of λ Aurigae (circled)
}}
{{Starbox observe
| epoch = J2000
| constell = Auriga
| dec = {{DEC|+40|05|56.5896}}
}}
{{Starbox character
| class = G1 V or {{nowrap|G1.5 IV-V Fe-1}}
| r-i = 0.32
| v-r =
| variable =
}}
{{Starbox astrometry
| radial_v = {{val|+66.53|0.14}}
| parallax = 80.1054
| p_error = 0.2158
}}
{{Starbox detail
| mass = {{val|1.081|+0.054|-0.029}}
| radius = {{val|1.331|0.021}}
| temperature = {{val|5890|4.3|fmt=commas}}
| luminosity = {{val|1.732|0.022}}
| age_gyr = 4, 5.0–7.9
}}
{{Starbox catalog
| names = {{odlist | B=λ Aur | F=15 Aurigae | BD=+39°1248 | FK5=1145 | GJ=197 | HD=34411 | HIP=24813 | HR=1729 | LFT=403 | LHS=1753 | LTT=11625 | SAO=40233 }}
}}
{{Starbox reference
| Simbad=lam+Aur
| ARICNS=00434
}}
{{Starbox end}}
Lambda Aurigae, Latinized from λ Aurigae, is a solar analog star in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of 4.71. Based upon parallax measurements, it is approximately {{Convert|40.7|ly|pc|abbr=off|lk=on}} distant from the Earth. The star is drifting further away with a high radial velocity of +66.5 km/s, having come to within {{convert|7.4945|pc|ly|1|adj=ri1|order=flip|abbr=on}} some 117,300 years ago. It has a high proper motion, traversing the celestial sphere at the rate of {{Val|0.844|ul=arcsecond}} per year.
Properties
This is a G-type main sequence star with a stellar classification of G1 V. It is sometimes listed with a class of G1.5 IV-V Fe-1, which indicates the spectrum is showing some features of a more evolved subgiant star along with a noticeable underabundance of iron. In terms of composition it is similar to the Sun, while the mass and radius are slightly larger. It is 73% more luminous than the Sun and radiates this energy from its outer atmosphere at an effective temperature of {{val|5890|u=K}}. At this heat, the star glows with the yellow hue of a G-type star. It has a low level of surface activity and is a candidate Maunder minimum analog.
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. 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 {{nowrap|[U, V, W]}} = {{nowrap|[+76, –39, –6] km/s}}.
Name
This star may have been called by the name Al Hurr, meaning the fawn in Arabic. Lambda Aurigae, along with μ Aur and σ Aur, were Kazwini's Al Ḣibāʽ (ألحباع), the Tent. 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 σ Aur as Al Ḣibāʽ III.
In Chinese, {{lang|zh|咸池}} ({{lang|zh-Latn|Xián Chí}}), meaning Pool of Harmony, refers to an asterism consisting of λ Aurigae, ρ Aurigae and HD 36041.{{in lang|zh}} 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}}. Consequently, the Chinese name for λ Aurigae itself is {{lang|zh|咸池三}} ({{lang|zh-Latn|Xián Chí sān}}, {{langx|en|the Third Star of Pool of Harmony}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060713.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 13 日] {{Webarchive|url=https://web.archive.org/web/20110716123228/http://aeea.nmns.edu.tw/2006/0607/ap060713.html |date=2011-07-16 }}
Observation
From Earth, Lambda Aurigae has an apparent magnitude of 4.71. The closest large neighboring star to Lambda Aurigae is Capella, located {{Convert|4.5|ly|pc|abbr=off|lk=on}} away. Hypothetically viewed from Lambda Aurigae, Capella's quadruple star system would have an apparent magnitude of approximately -5.48, about 40 times brighter than Sirius can be seen at maximum brightness from Earth.{{cite web | title=Magnitude Arithmetic|url=http://www.caglow.com/info/wtopic/mag-arith | work=Weekly Topic | publisher=Caglow | access-date=10 February 2023 | archive-url=https://web.archive.org/web/20120201203951/http://www.caglow.com/info/wtopic/mag-arith | archive-date=1 February 2012|url-status=live}}
References
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| access-date = 10 February 2023}}
| access-date = 10 February 2023}}
}}
External links
- [http://aladin.u-strasbg.fr/AladinPreview?-c=05+19+08.4745%2B40+05+56.586&ident=LHS++1753&submit=Aladin+previewer Image Lambda Aurigae]
{{Stars of Auriga}}
{{DEFAULTSORT:Lambda Aurigae}}