Browsing Research publications by Author "Guo, Z."

Now showing items 1-5 of 5

    • Assessing the stellar population and the environment of an HII region on the far side of the Galaxy 

      Chené, A. -N.; Benjamin, R. A.; Alegría, S. Ramírez; Borissova, J.; Kurtev, R.; Bidin, C. Moni; Mauro, F.; Lucas, P.; Guo, Z.; Smith, L. C.; Gonzalez-Fernandez, C.; Ivanov, V. D.; Minniti, D.; Anderson, L. D.; Armentrout, W. P.; Gonzalez, D.; Herrero, A.; Ramírez, K. Peña (2021-04-20)
      We have investigated the stellar and interstellar content of the distant star formation region IRAS 17591-2228 (WISE HII region GAL 007.47+0.06). It is associated to a water maser, whose parallax distance is d=20.4^{+2.8} ...

    • Discovery of a mid-infrared protostellar outburst of exceptional amplitude 

      Lucas, P. W.; Elias, Jay; Points, Sean; Guo, Z.; Stecklum, B.; Vorobyov, E.; Morris, C.; Borissova, J.; Kurtev, R.; Pena, C. Contreras; Medina, N.; Minniti, D.; Ivanov, V. D.; Saito, R. K. (2020-09-23)
      We report the discovery of a mid-infrared outburst in a Young Stellar Object (YSO) with an amplitude close to 8 mag at lambda ~ 4.6 microns. WISEA J142238.82-611553.7 is one of 23 highly variable WISE sources discovered ...

    • The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others 

      Lucas, P. W.; Smith, L. C.; Guo, Z.; Peña, C. Contreras; Minniti, D.; Miller, N.; Alonso-García, Javier; Catelan, M.; Borissova, J.; Saito, R. K.; Kurtev, R.; Navarro, M. G.; Morris, C.; Muthu, H.; Froebrich, D.; Ivanov, V. D.; Bayo, A.; Garatti, A. Caratti o; Sanders, J. L. (2024-02-01)
      We have performed a comprehensive search of a VISTA Variables in the Via Lactea (VVV) data base of 9.5 yr light curves for variable sources with ΔKs ≥ 4 mag, aiming to provide a large sample of high amplitude eruptive young ...

    • New Eruptive YSOs from SPICY and WISE 

      Peña, Carlos Contreras; Ashraf, M.; Lee, J. E.; Herczeg, G.; Lucas, P. W.; Guo, Z.; Johnstone, D.; Lee, H. G.; Jose, J. (2023-12-28)
      This work presents four high-amplitude variable YSOs (≃3 mag at near-or mid-IR wavelengths) arising from the SPICY catalog. Three outbursts show a duration that is longer than 1 year, and are still ongoing. And additional ...

    • UGPS J194310+183851 : an Unusual Optical and X-ray Faint Cataclysmic Variable? 

      Morris, C.; Maccarone, T. J.; Lucas, P. W.; Strader, J.; Britt, C. T.; Miller, N.; Swihart, S. J.; Cooper, W. J.; Drew, J. E.; Guo, Z. (2022-08-01)
      The growing number of multi-epoch optical and infrared sky surveys are uncovering unprecedented numbers of new variable stars, of an increasing number of types. The short interval between observations in adjacent near-infrared ...