Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245..593h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 2, May 1991, p. 593-603.
Astronomy and Astrophysics
Astrophysics
29
A Stars, Magellanic Clouds, Stellar Evolution, Supergiant Stars, Early Stars, Red Giant Stars, Stellar Atmospheres
Scientific paper
Non-LTE model atmospheres are used to show that the strength of the hydrogen lines and the Balmer jump in a group of A-type supergiants in the Large and Small Magellanic Clouds can best be explained by enhanced helium in the atmospheres of these supergiants. On the HR diagram these stars are found between M(Bol) is approximately equal to -6 to -8 mag, corresponding to an initial mass of 10 to 20 solar masses. Given their location on the HR diagram, their spectral and color anomalies which can be explained by enhanced helium, and the existence of spectroscopically normal A supergiants in the same luminosity range, it is suggested that these anomalous A-type supergiants are He-burning postred supergiants and that they are excellent candidates for the predecessor of the kind of star that became SN 1987a.
Groth Hans G.
Humphreys Roberta M.
Kudritzki Rolf Peter
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