Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107...43l&link_type=abstract
Astronomy and Astrophysics, vol. 107, no. 1, Mar. 1982, p. 43-47. Research supported by the Comision de Investigacion del Espac
Astronomy and Astrophysics
Astronomy
10
Carbon Stars, Mass To Light Ratios, O Stars, Open Clusters, Stellar Mass Ejection, Ultraviolet Spectra, Hertzsprung-Russell Diagram, Iue, Mass Flow Rate, Milky Way Galaxy, Resonance Lines, Stellar Evolution, Stellar Luminosity, Ultraviolet Astronomy
Scientific paper
The profiles of the ultraviolet C IV resonance lines of 6 O-type stars in IC 1805 observed by the IUE satellite are examined. The mass loss rates are determined by means of the fitting of theoretical line profiles on the observed lines. M varies as L to the 1.33 power, in qualitative agreement with the most recent parametrization of the dependence of M on stellar luminosity, radius and mass by Lamers (1981). However, the values of M in IC 1805, located 2.2 kpc away in the galactic anticenter direction, appears systematically smaller by a factor 1.6 than those predicted by the mean Lamers' relation, characterizing the large scale solar neighbourhood. Various possibilities exist to explain this difference, as the uncertainties on the ionization fraction for example, it is tentatively suggested that this difference is due to the gradient of metal content with the galactocentric distance.
Burki Gilbert
Llorente de Andres F.
Ruiz del Arbol J. A.
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