The bright pre-main-sequence shell star HR 5999.

Details The bright pre-main-sequence shell star HR 5999. The bright pre-main-sequence shell star HR 5999.

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979msngr..16...33t&link_type=abstract

The Messenger, vol. 16, p. 33-35

Astronomy and Astrophysics

Astronomy

5

Photometry:Pre-Main-Sequence Stars

Scientific paper

It has been known tor some time that stars are born by contraction in interstellar clouds. During most of this phase they remain invisible to us, because of the gas and dust shell in which they are imbedded. It is only towards the end ot the birth process, when they approach the Zero-Age Main Sequence in the Hertzsprung-Russell diagram, that the newborn stars start to shine through their cocoon. At least that is what most astronomers thought until recently, when observations showed that the very young star HR 5999 is at least three magnitudes above the Main Sequence. Drs. Pik Sin The and H.RE Tjin A Djie trom the Astronomical Institute of the University of Amsterdam (the Netherlands) explain how HR 5999 was recently observed simultaneously from La Silla, South Atrica and with the IUE satellite.

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