Description

Aim: Compilation of galactic stellar sources observed for OH maser emission in the transition at 1612, 1665, and 1667 MHz. Extension to H2O and SiO maser emission is in progress.
Status: The database contains 16879 OH maser observations at frequencies 1612, 1665, and 1667 MHz selected from the literature . These observations belong to 6900 different objects. 2905 objects were detected, with N=2407 showing the classical double-peak profile. Further details on the contents of the database are found under Statistics.
For each source selected, links to interferometric follow-up observations or monitoring programs are provided. Currently 501 interferometric observations from 73 papers, and 212 monitoring observations from 16 papers are included.
Completeness: 1612 MHz OH masers: Search of the literature started with the contents of the last catalogue published in 1989 by Te Lintel Hekkert et al. The additional literature search covers the years 1984 – 2022. The database is considered to be (almost) complete for detected stars. The database contains no non-detections published prior to 1984.
1665 and 1667 MHz OH masers: The literature search covers the years 1984 – 2022. The database contains no measurements published prior to 1984. The last catalogue including these transitions is by Engels (1979).
Interferometric and monitoring observations of OH masers: The literature search is complete back to the beginnings. It covers the years 1974 – 2022.
Information delivered: 1612 MHz OH masers: Given are the peak fluxes and velocities of the blue- and the red-shifted peak. Stellar radial velocities v(rad) and expansion velocities v(exp) of the circumstellar shell were calculated from v(rad) = 0.5 * {v(red) + v(blue)} and v(exp) = 0.5 * {v(red) - v(blue)}, if not listed in the original paper.
1665 and 1667 MHz OH masers: In case of profiles with multiple peaks, v(rad) and v(exp) were calculated from the outermost peaks listed. v(blue), f(blue) and v(red), f(red) were filled with the two strongest peaks listed.
Interferometric observations: Given are the name of the interferometer, the angular resolution and the sensitivity of the observations. In addition the presence of polarization information is indicated by a yes/no entry. The number of maps and the range of observing epochs are given.
Monitoring observations: The time interval of the observing epochs and, if available, the range of flux densities observed are given.
Collaborators: Felix Bunzel, Dieter Engels, Berit Heidmann
Citation: Engels, D., López-Martí, B., 2024, A database of circumstellar OH masers update, IAU Symposium 380, 368 or for earlier versions
Engels D., Bunzel F., 2015, A&A 582, A68
Disclaimer: Care has been taken to transfer the information contained in the literature as correctly as possible. Tables available only on paper were scanned and digitized. This process most probably was not error free. Deliberate modifications of the input data are described on the individual pages describing the literature sources (see References ). The use of this database is on your own risk. If in doubt, go back to the original literature.
Acknowledgements: This work was supported by the Deutsche Forschungsgemeinschaft under grant En 176/33-1