HM Sge monitoring needed for HST and SOFIA observations
Abstract:
Dr. Steve Goldman (Space Telescope Science Institute) writes: "We are requesting I-band and R-band photometry of HM Sge. The I-band helps us probe the pulsation of the red giant, while the R-band allows us to monitor the general brightness of the system. The I-band is particularly important."
Justification:
"The light curve of the Symbiotic Mira HM Sge has been changing in unexpected ways. We have published several journal articles (including AAVSO authors) using data from Hubble, SOFIA, and AAVSO, including data obtained in response to AAVSO Alert Notice 734 (2021). We are trying to understand the evolution and variability of this system after its recent outburst (1975). New observations will be important for providing a baseline for new Hubble observations as well as helping us understand the system's evolution."
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| HM Sge | 11.10 | NC+M |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
R (Cousins), I (Cousins)
Comparison Stars:
Finder charts with comparison stars may be created using the AAVSO's Variable Star Plotter (VSP; https://apps.aavso.org/vsp/).
Co-Authorship
Observers are eligible for co-authorship.
Additional Observer Input:
REVISED INSTRUCTIONS (29 Jan 2025): One observation in Rc and in Ic per week are requested; more frequent observations are not necessary. NASA Press release related to this work: https://hubblesite.org/contents/news-releases/2024/news-2024-018?news=true. Journal articles related to this research: https://iopscience.iop.org/article/10.3847/2515-5172/ac8808, https://ui.adsabs.harvard.edu/abs/2024ApJ...961...14G/abstract
Additional Submission Location:
Not provided
Notes:
No public notes