V1117 Her observations requested
Active Dates: June 8, 2021 – None
Abstract:
AAVSO Young Stellar Object (YSO) Section leader Michael Poxon (Great Plumstead, Norfolk, UK) requests coverage of the YSO V1117 Her. He writes: "The peculiar YSO V1117 Herculis has begun another fade. Recent observations by Gary Poyner and myself show the star fading to magnitude 14. This may become a deep fade or possibly a shallower 'precursor' fade as this object sometimes exhibits. Observations, both visual and multiwavelength, are encouraged, since the behaviour of this star's historical fading episodes may indicate rapidly-changing evolution of protoplanetary clumps in the circumstellar disc. V1117 Her often seems to have these precursory fades before the main event, but not so often, if at all, afterwards - suggesting maybe asymmetry in the circumstellar clumps. So it may be worth watching for these too."
Justification:
Observations, both visual and multiwavelength, are encouraged, since the behaviour of this star's historical fading episodes may indicate rapidly-changing evolution of protoplanetary clumps in the circumstellar disc. V1117 Her often seems to have these precursory fades before the main event, but not so often, if at all, afterwards - suggesting maybe asymmetry in the circumstellar clumps. So it may be worth watching for these too.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| V1117 Her | 12.20 | UXOR |
Cadence: Not Specified Precision: 100 |
Not Requested |
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: Michael Poxon; Imported Campaign (Alert Notice #744)