A5093693788- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
Abstract IRAS source 19312+1950 (hereafter I19312) is an infrared point with maser emissions of SiO, H 2 O, and OH molecules. Although initial observations suggested that I19312 might be evolved star, its characteristics are not fully consistent this classification. This study aims to further investigate the nature by conducting long-term monitoring comparing results other known astrophysical objects. We conducted using single-dish radio telescopes. The were then compared historical data...
Abstract Water fountains (WFs) are thought to be objects in the morphological evolution of circumstellar envelopes low- and intermediate-mass evolved stars, transitioning from spherically symmetric asymmetric shapes. We used databases 1612 MHz OH 22.235 GHz H 2 O maser sources search for new WF candidates using criterion a larger velocity range emission compared that emission. Thus, it is principle possible identify WFs with ranges smaller than those previously known WFs. For line, we...
Abstract Circumstellar OH maser lines are useful for studying the dynamics of circumstellar envelope (CSE) around evolved stars. This study aims to identify CSEs cold stars, which exhibit deviations from spherical expansion, by comparing velocity ranges main (1665/1667 MHz) with those satellite line (1612 MHz), using a database sources. We performed this comparison 377 In addition, infrared two-color diagrams, we examined evolutionary stages and properties objects showing excess (velocity...