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Metallicity Gradients in M 31, M 33, NGC 300 and the Milky Way Using Abundances of Different Elements
Peña, M.; Flores-Durán, S. N.
Metallicity gradients derived from planetary nebulae (PNe) using O, Ne, and Ar abundances are studied and compared to those from H II regions in the galaxies M 31, M 33, NGC 300 and the Milky Way. Galactocentric radii and chemical abundances were collected from the literature, carefully selecting a homogeneous sample for each galaxy. Metallicity g…
NGC 1261: A Time-Series VI Study of its Variable Stars
Arellano Ferro, A.; Calderón, J. H.; Bustos Fierro, I. H. +1 more
Time-series VI CCD photometry of the globular cluster NGC 1261 is employed to study its variable star population. A membership analysis of most variables based on Gaia DR2 proper motions and colours was performed prior to the estimation of the mean cluster distance and metallicity. The light curves of the member RR Lyrae were Fourier decomposed to…
Millimeter and Far-IR Study of the IRDC SDC 341.232-0.268
Rubio, M.; Firpo, V.; Cappa, C. E. +3 more
We analyze the molecular gas and dust associated with the infrared dark cloud SDC 341.232-0.268 in order to investigate the characteristics and parameters of the gas, determine the evolutionary status of four embedded EGO candidates, and establish possible infall or outflow gas motions. We base our study on 12CO(2-1), 13CO(2-…
The HH34 Jet/Counterjet System at 1.5 and 4.5µm
Raga, A. C.; Noriega-Crespo, A.; Reipurth, B.
We present a (previously unpublished) 1.5 µm archival HST image of the HH 34 Herbig-Haro jet, in which the northern counterjet is seen at an unprecedented angular resolution of ≈0.1" (this counterjet had only been imaged previously at lower resolution with Spitzer). The jet/counterjet structure observed in this image shows evidence of low-am…