HD 74180
Template:Short description Template:About Template:Starbox begin Template:Starbox image Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end
HD 74180 is a single[1] star in the constellation Vela. It is a yellow-white F-type supergiant with a mean apparent magnitude of +3.81 and a spectral classification F8Ib. Estimates of its distance to Earth vary between 3,200 and 8,300 light-years.
b Velorum has been classified as a suspected α Cygni variable star which varies by only 0.06 magnitude. There are possible periods near 53, 80, and 160 days, but the variation is largely irregular.[2] It lies less than a degree from the small open cluster NGC 2645, but is not a member.[3]
Several studies have considered b Velorum to be a highly luminous supergiant or hypergiant with an early F spectral type, for example F2 Ia+,[2] F0 Ia,[4] and F4 I.[5] There were corresponding luminosity estimates of Template:Solar luminosity. A 2015 study used the Barbier-Chalonge-Divan (BCD) system to derive a luminosity of Template:Solar luminosity and a cooler less luminous F8 Ib spectral type.[3]
Distance and size
Multiple papers give different distances for b Velorum. Bailer-Jones et al. (2021) give a distance of about Template:Convert.[6] The Hipparcos spacecraft give a parallax of Template:Val, translating into a distance of Template:Convert.[7] Aidelman et al. (2015) give a distance of Template:Convert.[3] At the Hipparcos distance, bTemplate:NbspVelorum has its apparent brightness diminished by 1.11Template:Nbspmagnitudes due to interstellar extinction.[8]
b Velorum has an angular diameter estimated at Template:Val.[9] The physical size depends on the star's distance, and could be Template:SigfigTemplate:NbspTemplate:Solar radius assuming the distance of Aidelman et al., Template:SigfigTemplate:NbspTemplate:Solar radius assuming the Hipparcos distance, or even Template:SigfigTemplate:NbspTemplate:Solar radius assuming the Bailer-Jones et al. distance.[10]
In chinese astronomy
In Chinese, Template:Lang (Template:Lang), meaning Celestial Earth God's Temple, refers to an asterism consisting of Kappa Velorum, Gamma2 Velorum, b Velorum and Delta Velorum.[11] Consequently, Kappa Velorum itself is known as Template:Lang (Template:Lang), "the Fifth Star of Celestial Earth God's Temple".[12]
Notes
References
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedeggleton - ↑ 2.0 2.1 2.2 Cite error: Invalid
<ref>tag; no text was provided for refs namedvariable - ↑ 3.0 3.1 3.2 Cite error: Invalid
<ref>tag; no text was provided for refs namedaidelman - ↑ Template:Cite journal
- ↑ Template:Cite journal
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedb-j - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedHIP - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedluck - ↑ Template:Cite journal
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedlang2006 - ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 – 研究資源 – 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.