| 词条 | 66 Eridani |
| 释义 |
|epoch=J2000 |constell=Eridanus |ra={{RA|05|06|45.65314}}[1] |dec={{DEC|-04|39|18.5939}}[1] |appmag_v=5.12[2] }}{{Starbox character |class=B9V[3] |b-v=-0.06[4] |u-b=-0.16[4] |variable=α2 CVn }}{{Starbox astrometry |radial_v=32.28 ± 0.10[7] |prop_mo_ra=10.70[1] |prop_mo_dec=-0.78[1] |parallax=10.56 |p_error=0.34 |parallax_footnote=[1] |absmag_v=0.37[5] }}{{Starbox orbit |reference=[6] |period_unitless=5.5226013 ± 0.0000020 d |periastron=2441356.499 ± 0.017 |eccentricity=0.0844 ± 0.0013 |periarg=160.9 ± 1.1 |k1=102.83 ± 0.20 |k2=100.35 ± 0.19 }}{{Starbox detail |source=[6] |component1=66 Eri A |mass=2.629 ± 0.032 |radius=1.948 ± 0.063 |temperature=11077 |luminosity=51.3 ± 3.3 |gravity=4.28 ± 0.03 |rotational_velocity=17.1 ± 0.2 |age_myr=30 |component2=66 Eri B |mass2=2.566 ± 0.032 |radius2=1.919 ± 0.061 |temperature2=10914 |luminosity2=46.9 ± 3.0 |gravity2=4.28 ± 0.03 |rotational_velocity2=16.9 ± 0.2 }}{{Starbox catalog |names={{odlist|V=EN Eri|BD=-04° 1044|HD=32964|HIP=23794|HR=1657|SAO=131777}}[7] }}{{Starbox reference |Simbad=66+Eri }}{{Starbox end}}66 Eridani is a binary star in the constellation of Eridanus. The combined apparent magnitude of the system is 5.12 on average.[2] Parallax measurements by Hipparcos put the system at some 309 light-years (95 parsecs) away.[1] This is a spectroscopic binary: the two stars cannot be individually resolved, but periodic Doppler shifts in its spectrum mean there must be orbital motion. The two stars orbit each other every 5.5226013 days.[6] Their orbit is fairly eccentric, at 0.0844.[6] The combined spectrum of 66 Eridani matches that of a B-type main-sequence star,[3] and the two stars have similar masses.[6] The spectrum also shows excess of mercury and manganese, as it is a type of chemically peculiar star called a mercury-manganese star.[6] 66 Eridani is a Alpha2 Canum Venaticorum variable. For this reason, it has been given the designation EN Eridani.[7] References1. ^1 2 3 4 5 {{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}} {{Stars of Eridanus}}2. ^1 {{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati, J. R.|year=2002}} 3. ^1 {{cite journal|bibcode=1999MSS...C05....0H|title=Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5|journal=Michigan Spectral Survey|volume=5|pages=0|author1=Houk, N.|author2=Swift, C.|year=1999}} 4. ^1 {{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}} 5. ^{{citation | title=Search for low-mass PMS companions around X-ray selected late B stars | last1=Hubrig | first1=S. | last2=Le Mignant | first2=D. | last3=North | first3=P. | last4=Krautter | first4=J. | journal=Astronomy and Astrophysics | display-authors=1 | volume=372 | pages=152–164 | date=June 2001 | doi=10.1051/0004-6361:20010452 | bibcode=2001A&A...372..152H | arxiv=astro-ph/0103201 | postscript=. }} 6. ^1 2 3 4 5 6 {{cite journal|bibcode=2011A&A...529A.160M|doi=10.1051/0004-6361/201016302|arxiv=1102.4661|title=Chemical spots in the absence of magnetic field in the binary Hg Mn star 66 Eridani|journal=Astronomy & Astrophysics|volume=529|pages=A160|year=2011|last1=Makaganiuk|first1=V.|last2=Kochukhov|first2=O.|last3=Piskunov|first3=N.|last4=Jeffers|first4=S. V.|last5=Johns-Krull|first5=C. M.|last6=Keller|first6=C. U.|last7=Rodenhuis|first7=M.|last8=Snik|first8=F.|last9=Stempels|first9=H. C.|last10=Valenti|first10=J. A.}} 7. ^1 {{cite simbad|title=* 66 Eri|accessdate=13 August 2017}} 10 : Eridanus (constellation)|Flamsteed objects|B-type main-sequence stars|Spectroscopic binaries|Alpha2 Canum Venaticorum variables|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects|Objects with variable star designations |
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