T Tauri -tähti

T Tauri, tähti jonka mukaan on nimetty kokonainen ryhmä tähtiä.
Tietokonemallikuva T Tauri -tähdestä, jota ympäröi sirkumstellaarinen kiekko.

T Tauri -tähti on nuori tähti, joka on kutistumassa kohti vakaata tilaa ja ydinreaktioiden alkamista[1]. Näissä tähdissä havaitaan epäsäännöllisiä valonvaihteluja, ne ovat siis kirkkaudeltaan muuttuvia tähtiä. Niiden muuttujaluokka on INT. T Tauri -tähdet luetaan sumumuuttujiin ja purkautuviin muuttujiin[2]. Nämä tähdet ovat nuorimpia näkyviä tähtiä. T Tauri -tähdissä on enemmän litiumia kuin Auringossa, koska ytimen lämpötila ei nouse tarpeeksi korkeaksi[3].selvennä

T Taurin yhteydessä on muuttuva heijastussumu, jota kutsutaan löytäjänsä, brittiläisen astronomin John Russell Hindin mukaan nimellä Hindin muuttuva sumu[4].

Katso myös

Lähteet

  • Karttunen, Hannu et al: Tähtitieteen perusteet. Tähtitieteellinen yhdistys Ursa ry, 2010. ISBN 978-952-5329-82-7

Viitteet

  1. ↑ http://www.ursa.fi/extra/kosmos/t/t-tauri-tahti.html. Viitattu 17.5.2012.
  2. ↑ http://www.ursa.fi/extra/kosmos/p/purkautuva_muuttuja.html. Viitattu 17.5.2012.
  3. ↑ Karttunen et al, s. 356
  4. ↑ Mattila, Kalevi: Auringosta äärettömyyteen, s. 76–77. Helsinki: Tähtitieteellinen yhdistys Ursa ry, 1979. ISBN 951-9269-09-6
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