About: U Lacertae

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U Lacertae is a spectroscopic binary star in the constellation Lacerta. Despite being in the constellation of Lacerta, U Lacertae is considered to be a member of the Cepheus OB1 association. It has been listed as a member of the open cluster ASCC 123. U Lacertae is a VV Cephei binary consisting of a red supergiant and a small hot companion. The companion has been identified from a high excitation component in the spectrum and from radial velocity variations, but the orbit is unknown.

Attributes	Values
rdf:type	Thing place dbo:Location schema:Place celestial body star
rdfs:label	U Lacertae (en) U Lacertae (sv)
rdfs:comment	U Lacertae är en röd superjätte och halvregelbunden variabel av SRC-typ i stjärnbilden Ödlan. Stjärnan varierar mellan fotografisk magnitud +9,4 och 12,1 med en period som inte är fastställd. (sv) U Lacertae is a spectroscopic binary star in the constellation Lacerta. Despite being in the constellation of Lacerta, U Lacertae is considered to be a member of the Cepheus OB1 association. It has been listed as a member of the open cluster ASCC 123. U Lacertae is a VV Cephei binary consisting of a red supergiant and a small hot companion. The companion has been identified from a high excitation component in the spectrum and from radial velocity variations, but the orbit is unknown. (en)
foaf:name	U Lacertae (en)
foaf:depiction
dct:subject	Binary stars Durchmusterung objects Emission-line stars Henry Draper Catalogue objects Hipparcos objects Lacerta (constellation) M-type supergiants Objects with variable star designations Semiregular variable stars 2MASS objects
Wikipage page ID	51246123 (xsd:integer)
Wikipage revision ID	1121798315 (xsd:integer)
Link from a Wikipage to another Wikipage	Bonner Durchmusterung List of largest stars VV Cephei Binary stars Durchmusterung objects Emission-line stars Henry Draper Catalogue objects Hipparcos objects Lacerta (constellation) M-type supergiants Objects with variable star designations Semiregular variable stars General Catalogue of Variable Stars Henry Draper Catalogue Cepheus OB1 2MASS 2MASS objects Open cluster Hipparcos Astrophysical maser Lacerta Semiregular variable star Red supergiant Spectroscopic binary Guide Star Catalog Tycho-2 Catalogue Semiregular variable Lacerta (constellation) Variable star designation AAVSO Position and proper motion catalogue
sameAs	U Lacertae U Lacertae U Lacertae U Lacertae U Lacertae
dbp:wikiPageUsesTemplate	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:Stars_of_Lacerta dbt:Val dbt:DEC dbt:Location_mark dbt:RA
thumbnail	wiki-commons:Special:FilePath/Lacerta_constellation_map.svg?width=300
absmag v	−5.6 (en)
appmag v	9.400000 (xsd:double)
b-v	+2.34 (en)
class	M4epIab + B (en)
constell	Lacerta (constellation)
dist pc	2750 (xsd:integer)
epoch	J2000 (en)
luminosity	87000 (xsd:integer)
mass	22 (xsd:integer)
p error	0.070800 (xsd:double)
parallax	0.351900 (xsd:double)
prop mo dec	−3.150 (en)
prop mo ra	−3.207 (en)
radial v	−68 (en)
radius	785 (xsd:integer)
u-b	+1.46 (en)
variable	Semiregular variable star
has abstract	U Lacertae is a spectroscopic binary star in the constellation Lacerta. Despite being in the constellation of Lacerta, U Lacertae is considered to be a member of the Cepheus OB1 association. It has been listed as a member of the open cluster ASCC 123. U Lacertae is a VV Cephei binary consisting of a red supergiant and a small hot companion. The companion has been identified from a high excitation component in the spectrum and from radial velocity variations, but the orbit is unknown. U Lacertae is a variable star classified as a semiregular variable. The periodicity is uncertain but a main period of 150 days and a long secondary period of 550 – 690 days have been suggested. A study of Hipparcos satellite photometry found an amplitude of 0.77 magnitudes and found no periodicity. The General Catalogue of Variable Stars lists an amplitude of 2.7 magnitudes. Water masers have been detected around U Lacertae, common in the extended atmospheres of very luminous cool stars. (en) U Lacertae är en röd superjätte och halvregelbunden variabel av SRC-typ i stjärnbilden Ödlan. Stjärnan varierar mellan fotografisk magnitud +9,4 och 12,1 med en period som inte är fastställd. (sv)
prov:wasDerivedFrom	wikipedia-en:U_Lacertae?oldid=1121798315&ns=0

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