Red supergiants in M31: extinction, metallicities and gas-to-dust ratio

Details Red supergiants in M31: extinction, metallicities and gas-to-dust ratio Red supergiants in M31: extinction, metallicities and gas-to-dust ratio

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pobeo..73..181n&link_type=abstract

Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 73, p. 181 - 190 (2002). In: Proceedings of the T

Mathematics

Probability

Supergiants, Andromeda Galaxy

Scientific paper

We derived individual extinction values for selected red supergiant (RSGs) candidates in M31 with broadband photometry. Taking into account their position on the colour-magnitude diagram and using a probability method, the metallicity of each star was estimated. In the range 2-15 kpc the ratio [O/H] is nearly constant. The derived individual extinctions and pencil beams values from three different gas maps (Westerbork HI, VLA HI and IRAM CO (1→0)-line survey) were used to obtain gas-to-dust ratio in M31. For the 9 most luminous stars both the ratios N(HI)/2 EB-V and N(HI+H2)/2EB-V are not very different from those in the Milky Way. Significant fractions outside the expected range of Galactic atomic gas-to-dust ratio are obtained for ~1/3 of the sample using Westerbork and for ~1/2 of the sample using VLA maps. The ratios are overestimated for objects located high above the midplane of M31 and underestimated - due to resolution effects, - for several RSGs coinciding with small HI clouds.

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