| dbo:abstract |
SW Ursae Majoris is a cataclysmic binary star system in the northern circumpolar constellation of Ursa Major, abbreviated SW UMa. During quiescence it has an apparent visual magnitude of 16.5–17, which is too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 526 light years from the Sun. The variable nature of this object was noted by L. Tseraskaya in 1909 when it increased in brightness to 10th magnitude. It was determined to be a U Geminorum star, indicating this is a binary star system. A short orbital period of 81.8 minutes was determined by and associates in 1986. The same year, and associates detected superhumps with a period of 84.0 minutes. Large amplitude quasi-periodic oscillations were observed by T. Kato and associates in 1992, which is a property of SU UMa-type dwarf novae. When the system is in a quiet period, it displays a periodicity of 15.9 minutes and has a marginal emission of soft X-rays. This is likely the rotation period of the white dwarf, and the system resembles an intermediate polar with a strongly-magnetized white dwarf as the accreting component. It undergoes outbursts that vary in brightness and duration. During quiescence, it is estimated that about 70% of the bolometric luminosity of the system is produced by the white dwarf, with almost all the rest produced by the accretion disk. (en) |
| dbo:thumbnail |
wiki-commons:Special:FilePath/SWUMaLightCurve.png?width=300 |
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dbr:SU_UMa dbr:Binary_star dbr:Ursa_Major dbr:Dwarf_nova dbr:Intermediate_polar dbr:Lidiya_Tseraskaya dbr:Light_curve dbc:Objects_with_variable_star_designations dbc:Ursa_Major_(constellation) dbc:White_dwarfs dbr:Quasi-periodic_oscillation dbr:Light_year dbr:Orbital_period dbr:Stellar_parallax dbr:White_dwarf dbr:Astrophysical_X-ray_source dbr:Bolometric_luminosity dbc:Dwarf_novae dbr:Sun dbr:Taichi_Kato dbr:Circumpolar_constellation dbr:Apparent_visual_magnitude dbr:Cataclysmic_variable_star dbr:Superhump dbr:U_Geminorum_Star dbr:U_Geminorum_star dbr:Allen_W._Shafter dbr:Edward_L._Robinson dbr:File:SWUMaLightCurve.png |
| dbp:absmagV |
+4.9 (en) |
| dbp:component |
White dwarf (en) donor (en) |
| dbp:constell |
dbr:Ursa_Major |
| dbp:epoch |
J2000 (en) |
| dbp:gravity |
8.010000 (xsd:double) |
| dbp:luminosity |
0.001000 (xsd:double) |
| dbp:mass |
0.100000 (xsd:double) 0.610000 (xsd:double) |
| dbp:pError |
0.060200 (xsd:double) |
| dbp:parallax |
6.200200 (xsd:double) |
| dbp:propMoDec |
5.928000 (xsd:double) |
| dbp:propMoRa |
−28.713 (en) |
| dbp:radius |
0.012900 (xsd:double) |
| dbp:temperature |
13854 (xsd:integer) |
| dbp:variable |
dbr:U_Geminorum_Star |
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dbt:Citation dbt:Div_col dbt:Div_col_end dbt:Reflist dbt:Short_description dbt:Starbox_astrometry dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_image dbt:Starbox_observe dbt:Starbox_reference dbt:Val dbt:± dbt:DEC dbt:Odlist dbt:RA dbt:Stars_of_Ursa_Major |
| dct:subject |
dbc:Objects_with_variable_star_designations dbc:Ursa_Major_(constellation) dbc:White_dwarfs dbc:Dwarf_novae |
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owl:Thing dbo:Place dbo:Location schema:Place dbo:CelestialBody dbo:Star |
| rdfs:comment |
SW Ursae Majoris is a cataclysmic binary star system in the northern circumpolar constellation of Ursa Major, abbreviated SW UMa. During quiescence it has an apparent visual magnitude of 16.5–17, which is too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 526 light years from the Sun. (en) |
| rdfs:label |
SW Ursae Majoris (en) |
| owl:sameAs |
wikidata:SW Ursae Majoris https://global.dbpedia.org/id/GkKaU |
| prov:wasDerivedFrom |
wikipedia-en:SW_Ursae_Majoris?oldid=1110861525&ns=0 |
| foaf:depiction |
wiki-commons:Special:FilePath/SWUMaLightCurve.png |
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wikipedia-en:SW_Ursae_Majoris |
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wikipedia-en:SW_Ursae_Majoris |
