Delta Virginis
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 Delta Virginis (δ Virginis, abbreviated Del Vir, δ Vir), formally named Minelauva Template:IPAc-en,<ref name="IAU-LSN"/> is a star in the zodiac constellation of Virgo. With an apparent visual magnitude of 3.4,<ref name=aaass22_9/> this star is bright enough to be seen with the naked eye. It is located at a distance of about Template:Convert from Earth.
NomenclatureEdit
δ Virginis (Latinised to Delta Virginis) is the star's Bayer designation.
It bore the traditional, medieval names Auva and Minelauva<ref name=hoffleit/> from the Arabic من العواء min al-ʽawwāʼ, meaning "in the lunar mansion of ʽawwaʼ" (a name of unknown meaning).<ref name=Kunitzsch/> In 2016, the IAU organized a Working Group on Star Names (WGSN)<ref name="WGSN"/> to catalog and standardize proper names for stars. The WGSN approved the name Minelauva for this star on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>
This star, along with Beta Virginis (Zavijava), Gamma Virginis (Porrima), Eta Virginis (Zaniah) and Epsilon Virginis (Vindemiatrix), were Al ʽAwwāʼ, 'the Barker'.<ref name=sb0/>
In Chinese, {{#invoke:Lang|lang}} ({{#invoke:Lang|lang}}), meaning Left Wall of Supreme Palace Enclosure, refers to an asterism consisting of Delta Virginis, Eta Virginis, Gamma Virginis, Epsilon Virginis and Alpha Comae Berenices.<ref name=zh/> Consequently, the Chinese name for Delta Virginis itself is {{#invoke:Lang|lang}} ({{#invoke:Lang|lang}}, Template:Langx),<ref name=lcsd/> representing {{#invoke:Lang|lang}} ({{#invoke:Lang|lang}}), meaning 'The Second Eastern Minister'.<ref name=SEM/> 東次相 (Dōngcìxiāng), westernized into Tsze Seang by R.H. Allen and meaning "the Second Minister of State".<ref name=pue/>
PropertiesEdit
The spectrum of Delta Virginis matches a stellar classification of M3 III,<ref name=Keenan1989/> which places it among the category of evolved stars called red giants. Indeed, the outer atmosphere of this star has expanded to around 67 times the radius of the Sun.<ref name=baines2021/> Even though it has just 1.19 times the mass of the Sun,<ref name=halabi/> this wide envelope gives it a luminosity of nearly 700 times the Sun's.<ref name="Lee2023"/> This energy is being radiated from a relatively cool outer atmosphere that has an effective temperature of 3,643 K.<ref name=halabi/> It is this cool temperature that gives it the orange-red glow of an M-type star.<ref name=csiro/>
The outer envelope of this star is undergoing a type of pulsation that occurs in a class of variable stars known as semiregular variables and its brightness varies from magnitude +3.32 to +3.40.<ref name=mnras400_4_1945/> Based upon frequency analysis of the observed light curve, the star's variability exhibits multiple periods of pulsation. The detected periods are 13.0, 17.2, 25.6, 110.1 and 125.8 days.<ref name=mnras400_4_1945/> This is a high-velocity star with a peculiar velocity of more than Template:Nowrap relative to the mean motion of other stars in the vicinity.<ref name=aaa430_165/>
Delta Virginis is a possible binary star, as an 11th magnitude star is located at an angular separation of 80 arcseconds. This K-type dwarf may have an orbital period of over 200,000 years, but this has not been confirmed.<ref name=kaler/> Template:Clear left
Substellar companionEdit
A 2023 study detected radial velocity variations in Delta Virginis (HD 112300), showing evidence of a substellar companion, likely a brown dwarf.<ref name="Lee2023"/>
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