HR 4049 - an old low-mass star disguised as a young massive supergiant

Details HR 4049 - an old low-mass star disguised as a young massive supergiant HR 4049 - an old low-mass star disguised as a young massive supergiant

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..49...29w&link_type=abstract

ESO Messenger (ISSN 0722-6691), Sept. 1987, v. 49, p. 29-32.

Physics

8

Stellar Color, Stellar Evolution, Stellar Spectra, Supergiant Stars, Asymptotic Giant Branch Stars, Classifications, Cosmic Dust, Light Curve, Spectral Energy Distribution

Scientific paper

The spectroscopic features and the possible nature of the HR 4049, the fifth-magnitude star classified as B9.5-Ib II, are examined. Coudespectra in the 3622-3900 A range, obtained at ESO's 1.52-m telescope, did display Balmer lines (from H9 to the Balmer limit), on the appearance of which the classification as a B9.5 Ib II was based, but no trace of Mg II, Fe II, or Cr II lines, i.e., lines that tend to be prominent in early-A supergiants. The difference between HR 4049 and normal early supergiants was still more prominent in the UV, with no features in common with spectra of typical late-B or early-A-supergiants seen in the HR 4049. It is concluded that, unlike normal supergiants, the HR 4049 is not a massive star. The possible nature of the HR 4049 as a post-asymptotic giant branch star is discussed.

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