| 词条 | Gamma Coronae Australis |
| 释义 |
| name = γ Coronae Australis}}{{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Corona Australis | ra = {{RA|19|06|25.11014}}[1] | dec = {{DEC|−37|03|48.3901}}[1] | appmag_v=4.20[1] }}{{Starbox character | class = F8V + F8V[2] | u-b = +0.51[3] | b-v = +0.01[3] | r-i = }}{{Starbox astrometry | radial_v = −51.60 ± 0.3[4] | prop_mo_ra = 96.74 ± 1.05[1] | prop_mo_dec = −281.71 ± 0.58[1] | parallax = 57.79 | p_error = 0.75 | parallax_footnote =[5] | absmag_v=3.73 / 3.80[6] }}{{Starbox orbit |reference=[7] |period=121.76 |axis=1.896 |inclination=149.6 |node=50.3 |periastron=2000.64 |eccentricity=0.320 |periarg=349.0 }}{{Starbox detail |source=[6] |component1=γ CrA A |component2=γ CrA B |temperature=6,090 |temperature2=6,100 |gravity=4.17 |gravity2=4.19 |radius=1.47 |radius2=1.42 |metal_fe=−0.07 |metal_fe2=−0.07 |age_gyr=5 |age_gyr2=5 |mass=1.15 |mass2=1.14 }}{{Starbox catalog | names={{odlist|B=γ CrA|CCDM= J19064-3704AB|CD=-37° 13048|HIP= 93825|SAO= 210928}}[1] | component1=γ CrA A | names1={{odlist|HD=177474|HR= 7226}}[15] | component2=γ CrA B | names2={{odlist|HD= 177475|HR= 7227}}[16] }}{{Starbox reference | Simbad=gam+CrA|sn=γ CrA | Simbad2=gam+CrA+A|sn2=γ CrA A | Simbad3=gam+CrA+B|sn3=γ CrA B }}{{Starbox end}}Gamma Coronae Australis (γ CrA), is a binary star located in the constellation Corona Australis. The system has a combined apparent visual magnitude of 4.20,[1] making it faintly visible to the naked eye. It is located 56.4 light-years (17.3 parsecs) from the Sun, based on its parallax.[5] Gamma Coronae Australis is a member of the Milky Way's thin disk.[6] The system is a visual binary, where the orbit is calculated from observations of one star orbiting the other. The primary, Gamma Coronae Australis A, is a late F-type main-sequence star with an effective temperature of 6,090 K.[6] It has an absolute an absolute magnitude of +3.73, and a mass of 1.15 solar masses.[6] The secondary, Gamma Coronae Australis B, is also F-type. With an effective temperature of 6,100 K, an absolute magnitude of +3.80, and a mass of 1.14 solar masses, the companion is almost identical to the primary.[6] Gamma Coronae Australis has been known to be a binary for a long time, and its two components have been given Henry Draper Catalogue designations of HD 177474[8] and HD 177475,[9] respectively. The two stars are separated by 1.896″ and orbit each other every 121.76 years.[7] References1. ^1 2 {{cite simbad|title=* gam CrA|access-date=20 June 2017}} {{Stars of Corona Australis}}2. ^{{cite journal|bibcode=2013MNRAS.428.3104E|doi=10.1093/mnras/sts257|arxiv=1210.5411|title=Circumstellar habitable zones of binary-star systems in the solar neighbourhood|journal=Monthly Notices of the Royal Astronomical Society|volume=428|issue=4|pages=3104|year=2012|last1=Eggl|first1=S.|last2=Pilat-Lohinger|first2=E.|last3=Funk|first3=B.|last4=Georgakarakos|first4=N.|last5=Haghighipour|first5=N.}} 3. ^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}} 4. ^{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053}} 5. ^1 2 3 4 5 {{cite journal | author=van Leeuwen, F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics |date=November 2007 | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 }} 6. ^1 2 3 4 5 {{cite journal|bibcode=2015ApJ...809..107F|doi=10.1088/0004-637X/809/1/107|title=Multiplicity Among F-Type Stars. II|journal=The Astrophysical Journal|volume=809|pages=107|year=2015|last1=Fuhrmann|first1=K.|last2=Chini|first2=R.}} 7. ^1 {{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|accessdate=20 June 2017}} 8. ^1 {{cite simbad|title=* gam CrA A|access-date=20 June 2017}} 9. ^1 {{cite simbad|title=* gam CrA B|access-date=20 June 2017}} 8 : F-type main-sequence stars|Binary stars|Corona Australis|Bayer objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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