NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T13:00:02 PDT
Help | Comment | NED Home

For refcode 1994A&A...291....1R:
Retrieve 6 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...291....1R The IMF and the extinction law in M 101: HST FOS spectra of extragalactic H II regions M.R. Rosa and P. Benvenuti The Space Telescope European Coordinating Facility European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85747 Garching bei Munchen, Germany Received 26 November 1993 / Accepted 7 June 1994 Abstract. We present medium resolution HST FOS spectra of the ionizing star clusters in four giant H II regions in the spiral galaxy M 101, spanning a range in [O/H] from 8.2 to 8.9. The observed energy distributions in the wavelength range 1150 A to 8200 A are compared to population synthesis models of extremely young star clusters, taking into account the attenuation by dust and the nebular continuum emission. The OB cluster spectra are compatible with short duration, 3 Myr old star formation bursts governed by a Miller-Scalo type solar neighborhood initial mass function (IMF). The attenuation law towards the targets in M 101 is found to be rather similar to the average galactic law but for a much weaker 2175 A bump. Since the observed shape of the composite continua is dominated by the form of the UV extinction, power-law IMFs skewed towards high stellar masses may also explain the observations with slightly modified extinction curves. However, on the basis of the data presented here there is no need to invoke second order effects such as a variation with metallicity of the slope of the IMF or the upper and lower stellar mass limits in the current burst of star formation respectively. Key words: HII regions - dust, extinction - galaxies: M 101; ISM - ultraviolet: galaxies
Retrieve 6 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home