| 词条 | Y Carinae |
| 释义 |
|name=Y Carinae }}{{Starbox observe |epoch= J2000 |ra= {{RA|10|33|10.85133}}[1] |dec= {{DEC|-58|29|55.0959}}[1] |appmag_v=8.16[2] {{nowrap|(7.53 - 8.48[3])}} |constell=Carina }}{{Starbox character |class=F2 + B9.0V[4] |r-i = |v-r = |b-v = +0.59[2] |u-b = |variable=Classical Cepheid[3] }}{{Starbox astrometry |radial_v=−12.90[5] |prop_mo_ra= −5.83[1] |prop_mo_dec= 3.21[1] |parallax= 1.07 |p_error= 1.10 |parallax_footnote=[1] |dist= |dist_ly= |dist_pc= |absmag_v= −3.0[6] }}{{Starbox orbit |reference=[6] |primary=A |name=B |period_unitless=1006.9 days |eccentricity=0.437 |k1=10.0 }}{{Starbox detail |component1=A |mass=3.8[6] |radius= |luminosity=1,250[6] |temperature=5,800[6] |metal= −0.230[2] |gravity= 1.800[2] |rotation= |age= }}{{Starbox catalog | names = Y Carinae, Y Car, CD−57°3305, GSC 08613-01464, HD 91595, HIP 51653, 2MASS J10331084-5829550, SAO 238178 }}{{Starbox reference | Simbad=Y+Carinae }}{{Starbox end}} Y Carinae (Y Car) is a Classical Cepheid variable, a type of variable star, in the constellation Carina. Its apparent magnitude varies from 7.53 to 8.48. The primary Cepheid pulsation period is 3.6 days, but it also pulsates with a secondary period of 2.56 days. It is known as a double-mode Cepheid, or a beat Cepheid since the two periods interfere to produce slow variations at a beat frequency.[6] The variable primary star is in a triple system with a very close pair of hot main sequence stars. The period of the outer pair is 2.76 years. The inner pair are constrained to orbit in less than 31 days, but the exact nature of the orbit is unknown. The existence of the close binary pair throws into doubt previous calculations of the mass of the pulsating star. The existence of high numbers of triple systems and short period Cepheids suggests that some at least of the short period Cepheids may have formed by mergers.[7] References1. ^1 2 3 4 {{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }} {{Stars of Carina}}2. ^1 2 3 {{cite journal|bibcode=2010A&A...515A.111S|title=The PASTEL catalogue of stellar parameters|journal=Astronomy and Astrophysics|volume=515|pages=A111|author1=Soubiran|first1=C.|last2=Le Campion|first2=J.-F.|last3=Cayrel De Strobel|first3=G.|last4=Caillo|first4=A.|year=2010|doi=10.1051/0004-6361/201014247|arxiv = 1004.1069 }} 3. ^1 {{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009|display-authors=etal}} 4. ^{{cite arxiv|title=Pulsating Components in Binary and Multiple Stellar Systems --- A Catalog of Oscillating Binaries|author1=Zhou|first1=A.-Y.|year=2010|eprint=1002.2729|class=astro-ph.SR}} 5. ^{{cite journal|bibcode=2004A&A...424..727P|title=SB9: The ninth catalogue of spectroscopic binary orbits|journal=Astronomy and Astrophysics|volume=424|issue=2|pages=727|author1=Pourbaix|first1=D.|last2=Tokovinin|first2=A. A.|last3=Batten|first3=A. H.|last4=Fekel|first4=F. C.|last5=Hartkopf|first5=W. I.|last6=Levato|first6=H.|last7=Morrell|first7=N. I.|last8=Torres|first8=G.|last9=Udry|first9=S.|year=2004|doi=10.1051/0004-6361:20041213|arxiv = astro-ph/0406573 }} 6. ^1 2 3 4 5 {{cite journal|bibcode=1997AJ....114.1176B|title=The dynamical mass of the beat cepheid Y carinae and stellar opacities|journal=The Astronomical Journal|volume=114|pages=1176|author1=Bohm-Vitense|first1=E.|last2=Evans|first2=N. R.|last3=Carpenter|first3=K.|last4=Morgan|first4=S.|last5=Beck-Winchatz|first5=B.|last6=Robinson|first6=R.|year=1997|doi=10.1086/118549}} 7. ^{{cite journal|bibcode=2005AJ....130..789E|title=High-Mass Triple Systems: The Classical Cepheid Y Carinae|journal=The Astronomical Journal|volume=130|issue=2|pages=789|author1=Evans|first1=Nancy Remage|last2=Carpenter|first2=Kenneth G.|last3=Robinson|first3=Richard|last4=Kienzle|first4=Francesco|last5=Dekas|first5=Anne E.|year=2005|doi=10.1086/430458|arxiv = astro-ph/0504169 }} 9 : Carina (constellation)|F-type stars|Objects with variable star designations|Henry Draper Catalogue objects|Classical Cepheid variables|Hipparcos objects|Durchmusterung objects|2MASS objects|Triple star systems |
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