Delta Virginis

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description

δ Virginis
(Minelauva)
Template:Location mark
Location of δ Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.32 - 3.40[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M3+ III[4]
U−B Template:Engvar +1.825[5]
B−V Template:Engvar +1.565[5]
Variable type Semiregular[2]
Astrometry
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: −469.99[1] mas/yr
Dec.: −52.83[1] mas/yr
Parallax (π)16.44±0.22 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)[1]
Absolute bolometric
magnitude (Mbol)		Template:Val[7]
Details
MassTemplate:Val[8] Template:Solar mass
RadiusTemplate:Val[9] Template:Solar radius
Luminosity697[10] Template:Solar luminosity
Surface gravity (log g)0.8[10] cgs
Temperature3,643[8] K
Metallicity [Fe/H]−0.06[10] dex
Rotational velocity (v sin i)8.1[10] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Minelauva, 43 Virginis, BD+04°2669, FK5 484, HD 112300, HIP 63090, HR 4910, LTT 13714, SAO 119674, WDS 12556+0324[11]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Delta Virginis (δ Virginis, abbreviated Del Vir, δ Vir), formally named Minelauva Template:IPAc-en,[12] is a star in the zodiac constellation of Virgo. With an apparent visual magnitude of 3.4,[5] this star is bright enough to be seen with the naked eye. It is located at a distance of about Template:Convert from Earth.

Nomenclature

δ Virginis (Latinised to Delta Virginis) is the star's Bayer designation.

It bore the traditional, medieval names Auva and Minelauva[13] from the Arabic من العواء min al-ʽawwāʼ, meaning "in the lunar mansion of ʽawwaʼ" (a name of unknown meaning).[14] In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] 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.[12]

This star, along with Beta Virginis (Zavijava), Gamma Virginis (Porrima), Eta Virginis (Zaniah) and Epsilon Virginis (Vindemiatrix), were Al ʽAwwāʼ, 'the Barker'.[16]

In Chinese, Script error: No such module "Lang". (Script error: No such module "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.[17] Consequently, the Chinese name for Delta Virginis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx),[18] representing Script error: No such module "Lang". (Script error: No such module "Lang".), meaning 'The Second Eastern Minister'.[19] 東次相 (Dōngcìxiāng), westernized into Tsze Seang by R.H. Allen and meaning "the Second Minister of State".[20]

Properties

The spectrum of Delta Virginis matches a stellar classification of M3 III,[4] 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.[9] Even though it has just 1.19 times the mass of the Sun,[8] this wide envelope gives it a luminosity of nearly 700 times the Sun's.[10] This energy is being radiated from a relatively cool outer atmosphere that has an effective temperature of 3,643 K.[8] It is this cool temperature that gives it the orange-red glow of an M-type star.[21]

File:DeltaVirLightCurve.png
A light curve for Delta Virginis, plotted from Hipparcos data[22]

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.[2] 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.[2] This is a high-velocity star with a peculiar velocity of more than 30 km s−1 relative to the mean motion of other stars in the vicinity.[23]

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.[24]

Substellar companion

A 2023 study detected radial velocity variations in Delta Virginis (HD 112300), showing evidence of a substellar companion, likely a brown dwarf.[10]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:Orbitbox end

References

Template:Reflist

External links

Template:Virgo

Template:Authority control

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named mnras400_4_1945
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggen1992
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Keenan1989
  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named aaass22_9
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aj135_1_209
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa489_3_1271
  8. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named halabi
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named baines2021
  10. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named Lee2023
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  12. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named hoffleit
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kunitzsch
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named sb0
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named zh
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named lcsd
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SEM
  20. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named pue
  21. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  22. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named CDS
  23. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa430_165
  24. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named kaler
Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Delta_Virginis&oldid=997453"