Zeta Aurigae

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Template:Short description

ζ Aurigae
Template:Location mark
Location of ζ Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.751[2] (Script error: No such module "val".[3])
Characteristics
Spectral type K5II (or K5Ib[4]) + B7 V[5]
U−B Template:Engvar +0.374[2]
B−V Template:Engvar +1.293[2]
R−I Template:Engvar 0.87Script error: No such module "Unsubst".
Variable type Algol[3]
Astrometry
Radial velocity (Rv)+12.11[4] km/s
Proper motion (μ) RA: +12.093 mas/yr[1]
Dec.: −19.324 mas/yr[1]
Parallax (π)3.791±0.05 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−3.21[7]
Orbit[8]
Period (P)Template:Cvt
Semi-major axis (a)Template:Solar radius
Eccentricity (e)0.3973±0.0007
Inclination (i)87.0°
Periastron epoch (T)RJD 53039.9 ± 0.10
Argument of periastron (ω)
(secondary)		328.9°±0.13°
Semi-amplitude (K1)
(primary)		23.17±0.02 km/s
Details
ζ Aur A
MassScript error: No such module "val".[9] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
Luminosity4,786[4] Template:Solar luminosity
Surface gravity (log g)1.33[10] cgs
TemperatureScript error: No such module "val".[9] K
Metallicity [Fe/H]−0.26[10] dex
Rotational velocity (v sin i)Script error: No such module "val".[4] km/s
ζ Aur B
MassScript error: No such module "val".[9] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
TemperatureScript error: No such module "val".[9] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Zeta Aurigae is an eclipsing binary star system in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ζ Aurigae, and abbreviated Zeta Aur or ζ Aur. Based upon parallax measurements, this system is approximately Script error: No such module "convert". distant from the Sun.[6] It has a combined apparent visual magnitude of 3.75,[2] which is bright enough to be seen with the naked eye. The system is drifting further away from the Sun with a radial velocity of +12 km/s.[4]

The two components are designated Zeta Aurigae A and B. The bright giant or supergiant component A has the official name Saclateni, pronounced Template:IPAc-en,[12] which is an old misspelling of "Sadatoni". Its hotter companion is a B-type dwarf. The pair orbit each other with a period of Template:Cvt.

Nomenclature

ζ Aurigae (Latinised to Zeta Aurigae) is the system's Bayer designation. The designations of the two components as ζ Aurigae A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[13]

The system bore the traditional names Haedus I (also Hoedus) and Sadatoni (rarely Saclateni).[14] It was one of the two haedi (Latin: 'kids') of the she-goat Capella, the other being Haedus II, Eta Aurigae. The name Sadatoni is from the Arabic الساعد الثاني as-sācid aθ-θānī "the second arm (of the charioteer)". The rare traditional name Azaleh is shared (in the form Hassaleh) with Iota Aurigae.[15] In 2016, the IAU organized a Working Group on Star Names (WGSN)[16] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[17] It approved the names Saclateni for the component Zeta Aurigae A and Haedus for Eta Aurigae on 30 June 2017 and they are both now so included in the List of IAU-approved Star Names.[12]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Pillars, refers to an asterism consisting of Zeta Aurigae, Epsilon Aurigae, Eta Aurigae, Upsilon Aurigae, Nu Aurigae, Tau Aurigae, Chi Aurigae and 26 Aurigae.[18] Consequently, the Chinese name for Zeta Aurigae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[19]

Properties

File:ZetaAurLightCurve.png
A light curve for Zeta Aurigae showing the brightness change as an eclipse ends, in three photometric colors. The inset plot shows the visible band data with an expanded vertical scale. Adapted from Bennett et al. (1996)[20]

Zeta Aurigae was first recognized as a spectroscopic binary by William Hammond Wright while analyzing photographic plates taken at Lick Observatory between 1898 and 1908. This star is among those earlier described by Antonia Maury as having a composite spectrum.[21] The first orbit was determined in 1924 by William Edmund Harper using measurements taken at Dominion Observatory, his orbital elements are very similar to the most recent determinations. Harper also noticed that the composite nature of the spectrum had disappeared on the one plate when the K type primary was nearest the sun indicating a possible eclipse.[22] In 1932 the eclipsing binary nature of the system was confirmed by Paul Guthnick, Heribert Schneller and independently by Josef Hopmann.[23]

The orbital plane of this eclipsing system is oriented close to the line of sight from the Earth, with an inclination estimated as 87.0°.[8] As a result, an eclipse of one star by the other occurs during each orbit, causing the net magnitude to decrease to +3.99. The pair have an orbital period of Script error: No such module "convert". and an eccentricity (ovalness) of 0.4.[8] The primary, component A, has been categorized as a K-type bright giant or supergiant star. Its companion, component B, is a B-type main-sequence star with a stellar classification B5 V or B7 V.[8][5] Because component B has a much hotter photosphere than component A, component B produces most of the system's ultraviolet light. This causes the brightness change seen during the eclipses (when B is obscured) to be much greater in ultraviolet light than it is in visible light.

References

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  1. ↑ a b c Template:Cite Gaia DR3
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b c d e Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1". Zeta Aurigae's database entry at VizieR.
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b c d Script error: No such module "citation/CS1".
  9. ↑ a b c d e f Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1". origin: STI
  11. ↑ Template:Cite simbad
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ 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.
  19. ↑ 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.
  20. ↑ Script error: No such module "citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ Script error: No such module "citation/CS1".
  23. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Auriga Template:Sky

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