HerbigAeBe stars need monitoring for Chandra observations
Active Dates: Nov. 21, 2018 – Dec. 12, 2018
Abstract:
Dr. Hans Moritz Guenther (MIT; Kavli Institute for Astrophysics and Space Research) and colleagues have requested AAVSO observers' assistance in monitoring several HerbigAeBe stars in support of upcoming observations scheduled with Chandra.
Justification:
We are going to observe five HerbigAeBe stars (HAeBes). HAeBes are young A or B type stars which are still surrounded by a protoplanetary disk. In that sense, they are similar to their lower mass bretheren, the classical T Tauri Stars. In T Tauri stars, we expect a dynamo similar to our Sun and we do indeed see stellar flares in X-rays which resemble those seen on the Sun or on other active main-sequence stars. In contrast, HAeBes should not have a magnetic dynamo, yet we still see X-rays from many of them. Since we don't understand what's going on, we are going to observe five HAeBe stars with Chandra to test if the strength of the X-ray emission is in some way related to the mass accretion rate. It would be very helpful to get an optical lightcurve and the stellar color for a few days before and after Chandra observations to know if anything unusual happens to these stars, e.g. if they have a super-bright flare or if they suddenly become hidden behind a screen of gas and dust as we saw in e.g. AA Tau or RW Aur in the last few years.
Requested Data Types:
Photometry, Spectroscopy
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| R Mon | 10.70 | UXOR |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
| V1307 Ori | 9.48 | INA |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
| V1410 Ori | 9.38 | INA |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
| BMAM-V346 | 16.70 | UG |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
| V1295 Aql | 7.84 | YSO |
Cadence: Not Specified Precision: 100 |
Cadence: Not Specified Resolution: 250 Desired SNR: 100 |
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. Hans Moritz Guenther; Imported Campaign (Alert Notice #657)