Iota Boötis

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

Template:Short description

ι Boötis
Template:Location mark
Location of ι Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.75[2] (Script error: No such module "val".[3])
Characteristics
Spectral type A7 V[4] + K0 V[5]
U−B Template:Engvar +0.06[6]
B−V Template:Engvar +0.20[6]
R−I Template:Engvar +0.09[6]
Variable type Delta Scuti variable[3]
Astrometry
Radial velocity (Rv)−18.7[7] km/s
Proper motion (μ) RA: −149.277 mas/yr[1]
Dec.: +89.135 mas/yr[1]
Parallax (π)33.8856±0.0820 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.38[8]
Details
ι Boo A
Mass1.650±0.04[1] Template:Solar mass
Radius1.715Script error: No such module "Su".[1] Template:Solar radius
Luminosity8.90Script error: No such module "Su".[1] Template:Solar luminosity
Surface gravity (log g)4.14Script error: No such module "Su".[1] cgs
Temperature7,764Script error: No such module "Su".[1] K
Metallicity [Fe/H]+0.19[9] dex
Rotational velocity (v sin i)144[10] km/s
Age785±223[1] Myr
HD 234121
Mass0.807Script error: No such module "Su".[11] Template:Solar mass
Radius0.824±0.017[11] Template:Solar radius
Luminosity0.411Script error: No such module "Su".[11] Template:Solar luminosity
Surface gravity (log g)4.511Script error: No such module "Su".[11] cgs
Temperature5,090Script error: No such module "Su".[11] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
Database references
SIMBADdata
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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

File:Iota Boötis and HD 234121.jpg
ι Boötis and its nearby companion HD 234121 (the faint component C is also visible to the south)

Iota Boötis is a wide binary star system in the constellation Boötes, approximately 96 light-years from Earth. Its name is a Bayer designation that is Latinized from ι Boötis, and abbreviated Iota Boo or ι Boo. The brighter component has the traditional name Asellus Secundus, pronounced Template:IPAc-en, which is Latin for "second donkey colt", and the Flamsteed designation 21 Boötis.[12] It is faintly visible to the naked eye with a typical apparent visual magnitude of +4.75.[2] Based on parallax measurements, it is located at a distance of Script error: No such module "convert". from the Earth. The star is drifting closer to the Sun with a radial velocity of −19 km/s.[7]

The companion is HD 234121, a K-type main-sequence star at an angular distance of 38.6 arcseconds; easily separated with binoculars.

Components

File:IotaBooLightCurve.png
A visual band light curve for Iota Boötis, adapted from Kiss (1995)[13]

The primary component is a white hued A-type main-sequence star with a stellar classification of A7V.[4] It is classified as a Delta Scuti-type variable star and its brightness varies from magnitude +4.73 to +4.78 with a stable period of 38 minutes.[8] This star is 785[1] million years old and has a high rate of spin, showing a projected rotational velocity of 144 km/s.[10] It has 1.8[4] times the mass of the Sun and 1.7 times the Sun's radius.[1] Iota Boötis is radiating 8.8[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,764 K.[1]

The common proper motion companion, HD 234121, is a magnitude 7.3 main-sequence star belonging to spectral class K0V.[5][14] It has a projected separation from ι Boo of Script error: No such module "val"..[4] HD 234121 has a mass of Template:Solar mass, a luminosity of Template:Solar luminosity, a temperature of Script error: No such module "val"., and a radius of Template:Solar radius.[11]

The Washington Double Star Catalog lists a third component, a 14th-magnitude star at 90 arcseconds,[14] but it is an unrelated background star.[15]

Nomenclature

This star, along with the other Aselli (θ Boo and κ Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - awlād al-ḍibā‘), "the Whelps of the Hyenas".Template:Category handlerTemplate:Category handler[<span title="Script error: No such module "string".">the transcription does not match the Arabic]Script error: No such module "Check for unknown parameters".[16]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Spear, refers to an asterism consisting of ι Boötis, κ2 Boötis and θ Boötis.[17] Consequently, the Chinese name for ι Boötis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[18]

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ a b c d e f g h i j k l m n Template:Cite Gaia DR3
  2. ↑ a b Script error: No such module "Citation/CS1".
  3. ↑ a b Script error: No such module "Citation/CS1".
  4. ↑ a b c d Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b c Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ a b c d e f Template:Cite Gaia DR3
  12. ↑ a b Template:Cite simbad
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ a b Script error: No such module "Citation/CS1".
  15. ↑ Template:Cite Gaia DR3
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ 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.
  18. ↑ 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.
Cite error: <ref> tag with name "AsellusSecondus" defined in <references> is not used in prior text.

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

External links

Template:Stars of Boötes

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Iota_Boötis&oldid=2018617"