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Search: authors:"M. L. McCall"

4 papers found.
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Planetary nebulae in M 32 and the bulge of M 31: Line intensities and oxygen abundances

We present spectroscopy of planetary nebulae in M 32 and in the bulge of M 31 that we obtained with the MOS spectrograph at the Canada-France-Hawaii Telescope. Our sample includes 30 planetary nebulae in M 31 and 9 planetary nebulae in M 32. We also observed one HII region in the disk of M 31. We detected [OIII]λ4363 in 18 of the planetary nebulae, 4 in M 32 and 14 in the bulge...

Fundamentals of the dwarf fundamental plane

Aims. Star-forming dwarfs are studied to elucidate the physical underpinnings of their fundamental plane. Processes controlling dynamics are evaluated, connections between quiescent and bursting dwarfs are examined, and the viability of using structural properties of dwarfs to determine distances is assessed.Methods. Deep surface photometry in Ks is presented for 19 star-forming...

Theoretical models of the planetary nebula populations in galaxies: The ISM oxygen abundance when star formation stops

Using theoretical models of the planetary nebula populations in galaxies, we investigate whether the current oxygen abundances in bright planetary nebulae can be used to predict the oxygen abundance in the interstellar medium when star formation stopped. These models successfully reproduce a constant planetary nebula luminosity function (PNLF) peak luminosity, the PNLF shape in...

IC 10: More evidence that it is a blue compact dwarf

We present optical spectroscopy of Hii regions in the Local Group galaxy IC 10 and UBVR photometry of foreground stars in three fields towards this galaxy. From these data, we find that the foreground reddening due to the Milky Way is . We find that IC 10 contains considerable internal dust, which qualitatively explains the variety of reddening values found by studies of its...