High-resolution spectroscopy and photometry requested for rho Cas study
Active Dates: June 18, 2021 – Dec. 31, 2024
Abstract:
Ernst Pollmann has requested AAVSO observers' assistance in obtaining high-resolution spectra of the very bright S Dor star rho Cas (HR 9045, 4.1-6.2 V) in support of a new long-term study. Photometry and visual observations are requested by the AAVSO.
Justification:
Rho Cas is a yellow hypergiant that is demonstrating behavior that indicates it needs to be monitored closely. Klochkova et al. report significant results of their analysis of long-term high-resolution spectroscopy, and they continue: 'In addition, photometric monitoring of the star (AAVSO) indicates that a new ejection of matter occurred in 2013, during which the brightness of the star decreased by 0.5m. Thus, the ejections in rho Cas are becoming more frequent. This may indicate that the star is approaching a crossing of the Yellow Void [of the H-R Diagram]. This fact suggests the urgent need of further monitoring of ρ Cas.'"
Requested Data Types:
Spectroscopy, Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| rho Cas | 4.10 | SDOR: |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
No photometry filters provided
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Notes:
Principal Investigator: Ernst Pollmann; Imported Campaign (Alert Notice #746)