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Optical Observations of the Nearby Type Ia Supernova 2021hpr

Zhang, Yu; Zhang, Tianmeng; Wu, Hong +6 more

We present the optical photometric and spectroscopic observations of the nearby Type Ia supernova (SN) 2021hpr. The observations covered the phase of -14.37 to +63.68 days relative to its maximum luminosity in the B band. The evolution of multiband light/color curves of SN 2021hpr is similar to that of normal Type Ia supernovae (SNe Ia) with the e…

Ionization and Star Formation in the Giant H II Region SMC-N66

Kniazev, A.; Hamann, W. -R.; Sabbi, E. +8 more

The NGC 346 young stellar system and associated N66 giant H II region in the Small Magellanic Cloud are the nearest example of a massive star-forming event in a low metallicity (Z ≈ 0.2Z _⊙) galaxy. With an age of ≲3 Myr this system provides a unique opportunity to study relationships between massive stars and their associated H II regio…