Massive stars in the Milky Way:
a new look with the FUSE satellite


Go to the previous page for a link to the press release on these results.


*
FUSE (top panel) and IUE (lower panel) spectra of an O6V Galactic star. The spectra (normalized to continuum flux) are the black line. A stellar model calculated with WM-BASIC (line-blanketed, hydrodynamic, non-LTE) is shown in green. In the FUSE range, a model of the absorption by the interstellar molecular hydrogen (H_2) plus neutral hydrogen HI is also shown (pink dotted line), to guide the eye to identify the bona fide stellar features, or those parts of the stellar features which are not affected by the heavy interstellar absorptions. See e.g. OVI, the red component of the SIV doublet, and the red component of the SVI doublet.
For early- and mid- O type stars (from supergiants to dwarfs) we derive effective Temperatures significantly lower than ``canonical'' values (assigned to these spectral types by older compilations). A complementary analysis of the optical spectra of these stars is in progress, as well as an extension to other O-types.
See papers listed below for details. Links to other papers can be found in the publication list.


Recent Publications and Preprints:

Bianchi, L. and Garcia, M., 2005, AJ, submitted
Far-UV and UV interstellar extinction in the Carina complex

Herald, J., Bianchi, L. and Hillier, D.J., 2005, ApJ, in press (astroph 0502074)
Discovery of NeVII in the winds of hot evolved stars

Garcia, M., and Bianchi, L. 2004, ApJ, 606, 497
The Effective Temperatures of Massive Stars. II. The Early-O types.
click here for the pdf file - - - link to ApJ

Bianchi, L., Garcia, M., and Herald, J. 2003, in "Winds, Bubbles and Explosions", RMxAA, 15, 226
The winds of O-type stars: ionization structure and revised parameters from far-UV spectra.

Bianchi, L., and Garcia, M. 2002, ApJ , 581, 610
The Effective Temperatures of mid-O type stars

Bianchi, L., Garcia, M., Hutchings, J., Fullerton, A. 2002, in "FUSE Science and Data Workshop", March 2002, p. 38
FUSE studies of O-type stars in Local Group galaxies
click here to download a printable version of the poster (A3 size)

Bianchi, L., and Garcia, M. 2002, AAS199
How Hot are Hot Stars? New Temperatures for mid-O types from FUSE data
click here to download a printable version of the poster (A3 size)

Bianchi et al. 2001 PASP,113, 697
Spectroscopy of Massive Stars in NGC6822 and M33

Back to home page