Southern T Tau Stars campaign in support of HST and TESS observations
Abstract:
Dr. Fred Walter (Stony Brook University) requests AAVSO observers to monitor 17 Southern T Tau stars in support of a multi-site multiwavelength campaign, including observations by HST and TESS, being carried out in April - June 2021. An 18th star is included in this request and is being observed by TESS although not by HST. The campaign aims to understand the processes involved in the formation of low mass stars, their circumstellar disks, and their planets, via the time-variability of these systems.
Justification:
Ground-based optical photometry is needed to place the TESS magnitudes in context and determine what the stars may have been doing when HST was observing them. Pre-main sequence stars may experience enhanced accretion events or long-lived flares, causing the star to become bluer. They may also experience variable circumstellar extinction, which may cause the star to become redder. Changes in extinction are important for interpreting the UV spectra, which are very sensitive to absorption.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| XX Cha | 13.10 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| CHX 18N | 11.76 | CTTS/ROT |
Cadence: Not Specified Precision: 100 |
Not Requested |
| HM Lup | 14.45 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| GQ Lup | 11.30 | CTTS/ROT |
Cadence: Not Specified Precision: 100 |
Not Requested |
| GW Lup | 13.54 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| NSV 20416 | 12.20 | CTTS/DIP |
Cadence: Not Specified Precision: 100 |
Not Requested |
| Sz 76 | 15.10 | WTTS/ROT |
Cadence: Not Specified Precision: 100 |
Not Requested |
| NSV 20359 | 15.30 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| NSV 18716 | 11.80 | CTTS/ROT+UV |
Cadence: Not Specified Precision: 100 |
Not Requested |
| GX Cha | 15.80 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| IN Cha | 15.80 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| T Cha | 10.09 | WTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| SZ Cha | 11.70 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| TW Cha | 12.30 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| SSTc2d J160000.6-422158 | 16.40 | WTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| NSV 20468 | 13.00 | TTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| NSV 20520 | 14.10 | CTTS |
Cadence: Not Specified Precision: 100 |
Not Requested |
| RU Lup | 9.80 | CTTS |
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
Forum URL
N/A
Notes:
Principal Investigator: Dr. Fred Walter; Imported Campaign (Alert Notice #741)