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- Theta_Tucanae abstract "Theta Tucanae (θ Tuc, θ Tucanae) is a star in the constellation Tucana.Like other stars in Tucana, it was given its Bayer designation by French explorer and astronomer Nicolas Louis de Lacaille in 1756. It was found to be variable in 1971.Theta Tucanae is a white A-type subgiant of spectral type A7IV with a mean apparent magnitude of +6.11, located approximately 423 light years from Earth. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +6.06 to +6.15 with periods of around 70 to 80 minutes. These Delta Scuti variables are a class of short-period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.Observations over the decades have shown that its colour slightly changes and it exhibits variation in light that indicate the star is actually an ellipsoidal binary with a period of seven days. The system is more luminous than expected, given the spectrum and distance of the primary star, indicating that the companion star must be contributing a good proportion of its light. Stellar evolution modelling has concluded that the system likely begun as a binary system, with one star about double the Sun's mass and the other roughly equivalent to that of the sun. The larger star eventually aged and expanded as it used up its core hydrogen, and begun having its mass siphoned off by the smaller star; the system is likely to have been an Algol-type eclipsing binary at this stage. This star appears now to be an aged star composed mostly of helium with very little hydrogen and with a mass of 0.2 solar masses and around 37 times the luminosity of our Sun and surface temperature of 7000 K, while the once-smaller star is the Delta Scuti variable that is now around two solar masses. Around 0.8 solar masses has been lost from the system over time.".
- Theta_Tucanae wikiPageID "2702775".
- Theta_Tucanae wikiPageRevisionID "602427142".
- Theta_Tucanae appmagV "+6.11".
- Theta_Tucanae constell Tucana.
- Theta_Tucanae dec "−71° 15' 58"".
- Theta_Tucanae distLy "490".
- Theta_Tucanae distPc "150".
- Theta_Tucanae epoch Epoch_(astronomy).
- Theta_Tucanae hasPhotoCollection Theta_Tucanae.
- Theta_Tucanae name "θ Tucanae".
- Theta_Tucanae names "HR 139, HD 3112, CP-71 20, FK5 2035, HIP 2629, SAO 255679.".
- Theta_Tucanae ra "2003.3".
- Theta_Tucanae spectral "A7IV".
- Theta_Tucanae subject Category:A-type_subgiants.
- Theta_Tucanae subject Category:Bayer_objects.
- Theta_Tucanae subject Category:Delta_Scuti_variables.
- Theta_Tucanae subject Category:Tucana_(constellation).
- Theta_Tucanae type BayerObjects.
- Theta_Tucanae type DeltaScutiVariables.
- Theta_Tucanae type Object100002684.
- Theta_Tucanae type PhysicalEntity100001930.
- Theta_Tucanae type Thing100002452.
- Theta_Tucanae type Variable109468959.
- Theta_Tucanae comment "Theta Tucanae (θ Tuc, θ Tucanae) is a star in the constellation Tucana.Like other stars in Tucana, it was given its Bayer designation by French explorer and astronomer Nicolas Louis de Lacaille in 1756. It was found to be variable in 1971.Theta Tucanae is a white A-type subgiant of spectral type A7IV with a mean apparent magnitude of +6.11, located approximately 423 light years from Earth.".
- Theta_Tucanae label "Theta Tucanae".
- Theta_Tucanae label "Theta Tucanae".
- Theta_Tucanae label "杜鵑座θ".
- Theta_Tucanae sameAs Theta_Tucanae.
- Theta_Tucanae sameAs m.07yz02.
- Theta_Tucanae sameAs Q3304093.
- Theta_Tucanae sameAs Q3304093.
- Theta_Tucanae sameAs Theta_Tucanae.
- Theta_Tucanae wasDerivedFrom Theta_Tucanae?oldid=602427142.
- Theta_Tucanae isPrimaryTopicOf Theta_Tucanae.