Alert Notice 843: Photometry of R Mon, UX Ori, CO Ori, RR Tau, and RY Tau needed now in support of spectroscopic campaign
Abstract:
Ruhee Kahar (University of Dundee (UD)) and Drs. Aurora Sicilia-Aguilar (UD), Justyn Campbell-White (European Southern Observatory), Ignacio Mendigutia (CAB,CSIC-INTA), Veronica Roccatagliata (Univ. Pisa), and Scott Gregory (UD) request AAVSO observers' assistance in monitoring five Young Stellar Objects - RY Tau, UX Ori, RR Tau, CO Ori, and R Mon - in support of spectroscopy being obtained with the CAHA 3.5-m telescope at Calar Alto Observatory (CARMENES) in a study of accreting young stars.
Justification:
We are taking repeated high-resolution spectra of intermediate-mass young stars to study the velocities and temporal variability of accretion related lines in these objects. The sample of stars includes HAeBe stars and massive T Tauri stars, that will evolve into A and B stars. The connection between both types is at present unclear and may be related to the magnetic activity of the future star. Previous observations of these objects also indicate some evidence of extinction by circumstellar material. We will be measuring the time variability (in velocity and relative intensity) of the emission lines to study the structure of the accretion columns. Non-axisymmetric structures are revealed as the star rotates. Using the archival data alongside this new data will also allow us to study the evolutionary status of the star-disc connection as well as to complete the gas emission information from the emission lines of the circumstellar material that crosses the stellar disc. This is a first-time exploration of the circumstellar environment in intermediate-mass young stars, where the mechanisms of accretion may deviate from magnetospheric and are poorly understood.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| RY Tau | 9.30 | CTTS/ROT |
Cadence: Not Specified Precision: 100 |
Not Requested |
| UX Ori | 9.40 | UXOR |
Cadence: Not Specified Precision: 100 |
Not Requested |
| RR Tau | 10.20 | UXOR |
Cadence: Not Specified Precision: 100 |
Not Requested |
| CO Ori | 9.90 | UXOR |
Cadence: Not Specified Precision: 100 |
Not Requested |
| R Mon | 10.70 | UXOR |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
B (Johnson), V (Johnson), r (Sloan), i (Sloan)
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: Ruhee Kahar; Imported Campaign (Alert Notice #843)