R Octantis (original) (raw)
R Octantis är en pulserande variabel av Mira Ceti-typ (M) i stjärnbilden Oktanten. Stjärnan var den första i Oktantens stjärnbild som fick en variabelbeteckning. Stjärnan varierar mellan visuell magnitud +6,4 och 13,2 med en period av 407 dygn.
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dbo:abstract | R Octantis, also known as HD 40857, is a solitary, red hued variable star located in the southern circumpolar constellation Octans. It has an apparent magnitude that varies in-between 6.4 and 13.2 within 405 days. At is maximum, it is barely visible to the naked eye. The object is located relatively far at a distance of about 1,900 light years based on parallax measurements from Gaia DR3, but is receding with a heliocentric radial velocity of 46 km/s. R Octantis has been known to have a peculiar spectra since 1892. It was revealed to have emission lines in its spectrum in a 1954 paper and was found to be a long period variable a year later. In 1966, R Octantis was officially classified as a Mira variable. Later observations reveal it to have an overabundance of oxygen on its outer layers. The object has an average stellar classification of M5.5e, indicating that it is a M-type star with emission lines in its spectrum. However, this can range from M5.3 to M8.4e. It is currently on the asymptotic giant branch, generating energy by fusing hydrogen and helium shells around an inert carbon core. As a result, it has expanded to 466 times the radius of the Sun. R Octantis radiates over 9,000 times the luminosity of the Sun from its photosphere at an effective temperature of 2,571 K, which is cooler than most Mira variables. (en) R Octantis är en pulserande variabel av Mira Ceti-typ (M) i stjärnbilden Oktanten. Stjärnan var den första i Oktantens stjärnbild som fick en variabelbeteckning. Stjärnan varierar mellan visuell magnitud +6,4 och 13,2 med en period av 407 dygn. (sv) |
dbo:thumbnail | wiki-commons:Special:FilePath/ROctLightCurve.png?width=300 |
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dbo:wikiPageLength | 7589 (xsd:nonNegativeInteger) |
dbo:wikiPageRevisionID | 1119173700 (xsd:integer) |
dbo:wikiPageWikiLink | dbr:Carbon dbr:Mira_variable dbr:Days dbr:Hydrogen dbr:Stellar_classification dbr:Light_curve dbr:Gaia_DR3 dbc:Durchmusterung_objects dbc:Emission-line_stars dbc:Henry_Draper_Catalogue_objects dbc:Hipparcos_objects dbc:Objects_with_variable_star_designations dbr:Naked_eye dbr:Photosphere dbr:Effective_temperature dbr:Apparent_magnitude dbr:Light_year dbr:Parallax dbr:Helium dbc:Octans dbr:Oxygen dbr:Emission_line dbr:Asymptotic_giant_branch dbr:International_Celestial_Reference_System dbr:J2000.0 dbc:Mira_variables dbr:Circumpolar_constellation dbr:Octans dbr:Radial_velocity dbr:Variable_star dbr:Photometric_system dbr:M-type_star dbr:Radius_of_the_Sun dbr:Luminosity_of_the_Sun dbr:File:ROctLightCurve.png |
dbp:appmagV | 6.413000 (xsd:double) |
dbp:class | (en) M5.5e (en) |
dbp:constell | dbr:Octans |
dbp:epoch | J2000.0 (en) |
dbp:luminosity | 9304 (xsd:integer) |
dbp:mass | 6.600000 (xsd:double) |
dbp:pError | 0.086200 (xsd:double) |
dbp:parallax | 1.715200 (xsd:double) |
dbp:propMoDec | 31.079000 (xsd:double) |
dbp:propMoRa | 0.540000 (xsd:double) |
dbp:radius | 466 (xsd:integer) |
dbp:temperature | 2571 (xsd:integer) |
dbp:variable | dbr:Mira_variable |
dbp:wikiPageUsesTemplate | dbt:Reflist dbt:Short_description dbt:Snd 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:DEC dbt:Odlist dbt:RA dbt:Stars_of_Octans |
dct:subject | dbc:Durchmusterung_objects dbc:Emission-line_stars dbc:Henry_Draper_Catalogue_objects dbc:Hipparcos_objects dbc:Objects_with_variable_star_designations dbc:Octans dbc:Mira_variables |
rdf:type | owl:Thing dbo:Place dbo:Location schema:Place dbo:CelestialBody dbo:Star |
rdfs:comment | R Octantis är en pulserande variabel av Mira Ceti-typ (M) i stjärnbilden Oktanten. Stjärnan var den första i Oktantens stjärnbild som fick en variabelbeteckning. Stjärnan varierar mellan visuell magnitud +6,4 och 13,2 med en period av 407 dygn. (sv) R Octantis, also known as HD 40857, is a solitary, red hued variable star located in the southern circumpolar constellation Octans. It has an apparent magnitude that varies in-between 6.4 and 13.2 within 405 days. At is maximum, it is barely visible to the naked eye. The object is located relatively far at a distance of about 1,900 light years based on parallax measurements from Gaia DR3, but is receding with a heliocentric radial velocity of 46 km/s. (en) |
rdfs:label | R Octantis (en) R Octantis (sv) |
owl:sameAs | yago-res:R Octantis wikidata:R Octantis dbpedia-sk:R Octantis dbpedia-sv:R Octantis https://global.dbpedia.org/id/JwV5 |
prov:wasDerivedFrom | wikipedia-en:R_Octantis?oldid=1119173700&ns=0 |
foaf:depiction | wiki-commons:Special:FilePath/ROctLightCurve.png |
foaf:isPrimaryTopicOf | wikipedia-en:R_Octantis |
foaf:name | R Octantis (en) |
is dbo:wikiPageRedirects of | dbr:R_Oct |
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is foaf:primaryTopic of | wikipedia-en:R_Octantis |