Zeta Eridani
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Eridanus |
Right ascension | 03h 15m 50.02656s[1] |
Declination | −08° 49′ 11.0220″[1] |
Apparent magnitude (V) | 4.80[2] |
Characteristics | |
Spectral type | kA4hA9mA9V[3] |
U−B color index | +0.07[2] |
B−V color index | +0.24[2] |
Astrometry | |
Radial velocity (Rv) | −5.8±4.2[4] km/s |
Proper motion ( | RA: −0.35[1] mas/yr Dec.: +46.10[1] mas/yr |
Parallax ( | 29.72 ± 0.29 mas[1] |
Distance | 110 ± 1 ly (33.6 ± 0.3 pc) |
Absolute magnitude (MV) | 1.97[5] |
Orbit[6] | |
Period (P) | 17.9297±0.0039 d |
Eccentricity (e) | 0.14±0.03 |
Periastron epoch (T) | 43,051.07±0.83 JD |
Argument of periastron ( (secondary) | 122±11° |
Semi-amplitude (K1) (primary) | 21.5±0.6 km/s |
Details | |
Mass | 1.85[7] M☉ |
Radius | 10.3[7] R☉ |
Luminosity | 10.3[8] L☉ |
Surface gravity (log g) | 4.05[7] cgs |
Temperature | 7,575[7] K |
Metallicity [Fe/H] | 0.04[7] dex |
Rotational velocity (v sin i) | 82[5] km/s |
Age | 800[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Zeta Eridani (
Zeta Eridani is the primary or 'A' component of a multiple star system designated WDS J03158-0849 (the secondary or 'B' component is 14 Eridani).[11] Zeta Eridani's two components are therefore designated WDS J03158-0849 Aa and Ab. Aa is formally named Zibal /ˈzaɪbəl/, the traditional name for the system.[12]
Nomenclature
[edit]Zeta Eridani bore the traditional name of Zibal. This is an old misreading of the Arabic رئل riʼal "ostrich chicks" (with the carrier letter for the glottal stop taken for a 'b', and ر 'r' taken for ز 'z'), originally applied to a number of stars near Beid and Keid.[14]
In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[16] It approved the name Zibal for the component WDS J03158-0849 Aa on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[12]
Properties
[edit]Zeta Eridani is a single-lined[17] spectroscopic binary system with an orbital period of 17.9 days and an eccentricity of 0.14.[5] The primary is a mild Am star[5] with a stellar classification of kA4hA9mA9V.[3] This notation indicates this is a main-sequence star with the Ca-II K absorption line strength (k) of an A4 star, and the hydrogen lines (h) and metallic lines (m) of an A9 star. It has about 185% of the Sun's mass and 10.3 times the Sun's radius.[7] This is a relatively young star with an estimated age of 800 million years,[9] and it appears to have a moderately high rotation rate with a projected rotational velocity of 82 km/s.[5]
The system displays a statistically significant infrared excess at a wavelength of 70
References
[edit]- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ a b c d e Iliev, I. Kh.; et al. (August 2006), "Abundance analysis of Am binaries and search for tidally driven abundance anomalies - II. HD861, HD18778, HD20320, HD29479, HD96528 and HD108651", Monthly Notices of the Royal Astronomical Society, 370 (2): 819–827, Bibcode:2006MNRAS.370..819I, doi:10.1111/j.1365-2966.2006.10513.x, S2CID 56133360.
- ^ Abt, H. A.; Levy, S. G. (October 1985), "Improved study of metallic-line binaries", Astrophysical Journal Supplement Series, 59: 229–247, Bibcode:1985ApJS...59..229A, doi:10.1086/191070.
- ^ a b c d e f Pawellek, Nicole; et al. (September 2014), "Disk Radii and Grain Sizes in Herschel-resolved Debris Disks", The Astrophysical Journal, 792 (1): 19, arXiv:1407.4579, Bibcode:2014ApJ...792...65P, doi:10.1088/0004-637X/792/1/65, S2CID 119282523, 65.
- ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b Vican, Laura (June 2012), "Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey", The Astronomical Journal, 143 (6): 135, arXiv:1203.1966, Bibcode:2012AJ....143..135V, doi:10.1088/0004-6256/143/6/135, S2CID 118539505.
- ^ "* zet Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-10.
{{cite web}}
: CS1 maint: postscript (link) - ^ "Washington Double Star Catalog". United States Naval Observatory. Retrieved 23 February 2018.
- ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
- ^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
- ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
- ^ IAU Division C Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
- ^ "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14.
- ^ Abt, Helmut A. (January 2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117, S2CID 122811461.
- ^ Rhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs", The Astrophysical Journal, 660 (2): 1556–1571, arXiv:astro-ph/0609555, Bibcode:2007ApJ...660.1556R, doi:10.1086/509912, S2CID 11879505.
External links
[edit]- Kaler, James B. (January 13, 2012), "Zibal", Stars, University of Illinois, retrieved 2016-10-11.