HD 139966
HD 139966 is an RR Lyrae star, previously incorrectly identified as an eclipsing binary. It is part of the multiple system HH Nor. Time series spectra are required to cover several pulsation cycles.
- HH Nor (RA=15:43:29.4 Dec=-51:50:37.5) is actually a visual double star, there is an eclipsing binary nearby (separation is 12''6). The brighter one (changing betweeen 8.8 and 9.3 mag) is the RR Lyrae component and has the designation HD139966. A finder chart is provided to aid in locating the correct target.
- The pulsation period is ~0.6 days.
- Preferred wavelength range is 5800-6700A
- Ideally R > 6000, S/N at least ~40-50.
- If limited by instrumentation, it is preferable to sacrifice R for wider wavelength coverage, down to a limit of R ~ 3500.
- Please keep integrations below 1800 seconds to ensure temporal changes are not lost.
- Please take accompanying spectra of the RV standard alp TrA (HD150798) for all observations.
The project PI is Aliz Derekaz
Data usage
Please be sure to read our data usage policy if you intend to use this data in any publication.
Spectra
| JD | Date UTC | Observer | Range | R (λ/Δλ) | Download all 1 (zip) | |
|---|---|---|---|---|---|---|
|
2457181.0576 | 2015-06-07T13:18:22 | TBohlsen | 3799 - 7199 | 1418 | Download | Download all (zip) |