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About: Tau4 Serpentis     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatFlamsteedObjects, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingplacedbo:Locationschema:Placecelestial bodyyago:WikicatBayerObjectsyago:WikicatM-typeBrightGiantsyago:WikicatSemiregularVariableStarsyago:Animal100015388yago:CelestialBody109239740yago:Giant101323781yago:LivingThing100004258yago:NaturalObject100019128yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930yago:WikicatHenryDraperCatalogueObjectsyago:WikicatHipparcosObjectsstaryago:Star109444100yago:VariableStar109469152yago:Whole100003553yago:WikicatDurchmusterungObjectsyago:WikicatFlamsteedObjects New Facet based on Instances of this Class

Tau4 Serpentis, Latinized from τ4 Serpentis, is a variable M-type giant star in the constellation of Serpens, approximately 710 light-years from the Earth. With a spectral classification M5IIIa, Tau4 Serpentis is a cool red giant star. The spectrum varies, and some sources classify it between M4IIIe and M6IIIe. Some of its spectral lines show an inverse P Cygni profile, where cold infalling gas on to the star creates redshifted hydrogen absorption lines next to the normal emission lines. It is classified as a semiregular late-type variable, and its magnitude varies between +5.89 and +7.07 with a period of approximately 100 days.