2 papers
astro-ph.GA2025
The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS
J. L. Chen, J. S. Zhang, J. X. Ge +6
Using the IRAM 30 m telescope, we presented observations of N2H+ J = 1-0, CCS JN = 87-76 and 77-66 lines toward a large sample of ultracompact HII regions (UC HIIs). Among our 88 U…
astro-ph.SR2024
Can near-to-mid infrared spectral energy distribution quantitatively trace protoplanetary disk evolution?
Mingchao Liu, Jinhua He, Zhen Guo +2
Infrared (IR) spectral energy distribution (SED) is the major tracer of protoplanetary disks. It was recently proposed to use the near-to-mid IR (or K-24) SED slope defined be…