| 词条 | LS I +61 303 |
| 释义 |
| epoch=J2000 | ra={{RA|02|40|31.6643}}[1] | dec= {{DEC|+61|13|45.592}}[1] | appmag_v=10.61 - 10.83[3] | constell=Cassiopeia }}{{Starbox character | class=B0Ve[4] | b-v=+0.86[5] | u-b=−0.34[5] | variable = High-mass X-ray binary[3] }}{{Starbox astrometry | radial_v=−41.41 | prop_mo_ra=0.27[8] | prop_mo_dec= 2.38[8] | parallax=0.45 | p_error=0.23 | parallax_footnote=[1] }}{{Starbox catalog | names=V615 Cas, 1RXS J024033.5+611358, TYC 4047-1917-1, HIP 12469 }}{{Starbox reference |Simbad=HIP+12469 }}{{Starbox end}} LS I +61 303 is a microquasar, a binary system containing a massive star and a compact object. The compact object is a black hole candidate and is around 7,000 light years away. DiscoveryLS I +61 303 is an 11th magnitude star that was recognised as a luminous object and catalogued as an OB star in 1959.[11] It was included in the Hipparcos survey as HIP 12469 and had its parallax measured at 5.65±2.28 mas, revised to −0.29±2.99 mas in the new reduction.[8] The first Gaia data release gave a parallax of 0.45±0.23 mas.[1] The galactic radio source GT 0236+610 was found at the same position as LS I +61 303. A gamma-ray source 2CG 135+01 was found within a degree of its position, and the MAGIC telescope confirmed that LS I +61 303 was the source of the gamma-rays. Periodic X-ray outbursts also occur.[14] Binary systemLS I +61 303 shows the spectrum of a Be star, a B0 main sequence star with disk that produces emission lines in its spectrum. Variations in its radial velocity show that it is in orbit with an unseen compact object having a mass between {{solar mass|1 and 4}}. The pair orbit every 36.406 days.[14] Although the uncertain mass of the compact object would allow it to be a neutron star, it is thought likely to be a black hole. VariabilityLS I +61 303 varies slightly at optical wavelengths, but measurements going back to 1887 show no obvious period. It also shows regular x-ray outbursts coinciding with its orbital period, and strong radio variability.[17] It was given the variable star designation V615 Cassiopeiae.[3] MicroquasarLS I +61 303 emits HE and VHE (High Energy and Very High Energy) gamma rays.[4] It is only one of three known star systems that produce such energetic rays. The other two systems are PSR B1259-63 and LS 5039.[14] References1. ^1 {{cite journal|bibcode=1979AJ.....84.1030G|title=The radio, optical, X-ray, gamma-ray star LSI +61 deg 303|journal=Astronomical Journal|volume=84|pages=1030|author1=Gregory|first1=P. C|last2=Taylor|first2=A. R|last3=Crampton|first3=D|last4=Hutchings|first4=J. B|last5=Hjellming|first5=R. M|last6=Hogg|first6=D|last7=Hvatum|first7=H|last8=Gottlieb|first8=E. W|last9=Feldman|first9=P. A|last10=Kwok|first10=S|year=1979|doi=10.1086/112508}} [1][2][3][4][5][6][7][8]2. ^1 2 {{cite journal|bibcode=2015A&A...574A..33R|title=Long-term variability of high-mass X-ray binaries. I. Photometry|journal=Astronomy & Astrophysics|volume=574|pages=A33|author1=Reig|first1=P|last2=Fabregat|first2=J|year=2015|doi=10.1051/0004-6361/201425008|arxiv=1411.7163}} 3. ^1 2 3 {{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}} 4. ^1 2 {{cite journal | title=Chandra Observations of the Gamma-Ray Binary LS I +61 303: Extended X-Ray Structure? | journal=The Astrophysical Journal Letters | volume=664 | issue=1 | year=2007 | pages=L39–L42 | doi=10.1086/520674 |bibcode = 2007ApJ...664L..39P |arxiv = 0706.0877 | last1=Paredes | first1=Josep M | last2=Ribó | first2=Marc | last3=Bosch-Ramon | first3=Valentí | last4=West | first4=Jennifer R | last5=Butt | first5=Yousaf M | last6=Torres | first6=Diego F | last7=Martí | first7=Josep }} 5. ^1 2 3 {{cite journal|bibcode=2006Sci...312.1771A|arxiv=astro-ph/0605549|title=Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303|journal=Science|volume=312|issue=5781|pages=1771–3|author1=Albert|first1=J|last2=Aliu|first2=E|last3=Anderhub|first3=H|last4=Antoranz|first4=P|last5=Armada|first5=A|last6=Asensio|first6=M|last7=Baixeras|first7=C|last8=Barrio|first8=J. A|last9=Bartelt|first9=M|last10=Bartko|first10=H|last11=Bastieri|first11=D|last12=Bavikadi|first12=S. R|last13=Bednarek|first13=W|last14=Berger|first14=K|last15=Bigongiari|first15=C|last16=Biland|first16=A|last17=Bisesi|first17=E|last18=Bock|first18=R. K|last19=Bordas|first19=P|last20=Bosch-Ramon|first20=V|last21=Bretz|first21=T|last22=Britvitch|first22=I|last23=Camara|first23=M|last24=Carmona|first24=E|last25=Chilingarian|first25=A|last26=Ciprini|first26=S|last27=Coarasa|first27=J. A|last28=Commichau|first28=S|last29=Contreras|first29=J. L|last30=Cortina|first30=J|display-authors=1|year=2006|doi=10.1126/science.1128177|pmid=16709745}} 6. ^1 2 3 4 {{cite journal|bibcode=2016A&A...595A...2G|doi=10.1051/0004-6361/201629512|arxiv=1609.04172|title=Gaia Data Release 1|journal=Astronomy & Astrophysics|volume=595|pages=A2|year=2016|author=Gaia Collaboration}} 7. ^1 {{cite journal|bibcode=1959LS....C01....0H|title=Luminous stars in the Northern Milky Way. Part I|journal=Hamburger Sternw|volume=01|author1=Hardorp|first1=J|last2=Rohlfs|first2=K|last3=Slettebak|first3=A|last4=Stock|first4=J|year=1959}} 8. ^1 2 3 {{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|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} }} External links
8 : Neutron stars|Microquasars|Cassiopeia (constellation)|Objects with variable star designations|Hipparcos objects|Be stars|B-type main-sequence stars|Stellar black holes |
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