Effective temperature of ionizing stars in extragalactic H iiregions – II. Nebular parameter relationships based on CALIFA data
نویسندگان
چکیده
منابع مشابه
A Comprehensive Study of High-metallicity Giant Extragalactic H Ii Regions: Ionizing Populations
Theoretically, the evolution of a young stellar population depends on metallicity at least through two very important effects: the increasing opacity of the stellar material and the dependence of mass loss on metal content in high mass stars. As a consequence of the first, the effective temperature of ionizing stars should be lower in regions of higher metallicity (see for example McGaugh 1991)...
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We present spectrophotometry in the 3600–9700 Å region for a sample of 39 H II regions in the Galaxy and Magellanic Clouds, for which independent information is available on the spectral types and effective temperatures of the ionizing stars. The spectra have been used to evaluate nebular diagnostics of stellar temperature, metal abundance, and ionization parameter, and compare the observed beh...
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Using the NIFS near–infrared integral–field spectrograph behind the facility adaptive optics module, ALTAIR, on Gemini North, we have identified several massive O–type stars that are responsible for the ionization of the Galactic Ultra– Compact H II region G45.45+0.06. The sources “m” and “n” from the imaging study of Feldt et al. (1998) are classified as hot, massive O–type stars based on thei...
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We rediscuss the temperature of O dwarfs based on new non-LTE line blanketed atmosphere models including stellar winds computed with the CMFGEN code of Hillier & Miller (1998). Compared to the latest calibration of Vacca et al. (1996), the inclusion of line blanketing leads to lower effective temperatures, typically by ∼ 4000 to 1500 K for O3 to O9.5 dwarf stars. The dependence of the Teff–scal...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2018
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sty3026