CCD campaign to observe 1059+23 AH Leo
Abstract:
AAVSO Council member Dr. Pamela Gay, Harvard University, requested assistance in observing the RR Lyrae variable star AH Leo closely this spring and early summer. She is studying the Blazhko cycle and other periodicities in this star. Precise, well time-sampled observations are essential. AH Leo rises from and falls back to a minimum magnitude of about V = 14.35 every 0.466 day with an evolving period. Every 25 days, AH Leo's Blazhko cycle repeats itself, causing its amplitude to vary from deltaV = 0.5 to 1.2 magnitudes. Observations covering the Blazhko cycle for multiple cycles help understand the consistency and identify longer periodicities. Fourier analysis of the light curve's all phases is requested, emphasizing observing during all phases, including the descending branch and minimum light. V-band CCD observations are preferred, but all optical bands are welcome. Observations should be submitted to the AAVSO using the CCD upload tool by the end of its observing season in June.
Justification:
Observations are essential to understand AH Leo's Blazhko cycle and other periodicities. Precise, well time-sampled observations are especially important to cover the Blazhko cycle for multiple consecutive cycles to understand what repeats, identify new periodicities, and study the star’s every rise and fall. Observing during all phases allows for better Fourier analysis and helps identify any changes during descending branch and minimum light.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| AH Leo | 13.67 | RRAB/BL |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
V (Johnson)
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
Forum URL
N/A
Notes:
Principal Investigator: Dr. Pamela Gay; Imported Campaign (Alert Notice #336)