Abstract: Marbely Calderon (University of Michigan) writes:
Young stellar objects (YSOs) are variable due to the rotation of the system, episodic accretion, and mass ejections (winds). We request simultaneous multi-color photometric observations in support of an upcoming spectroscopic campaign. The photometry will mainly be used to flux-calibrate these spectroscopic observations, for their analysis, and the characterization of the accretion state of the source.
Justification: Stars are born surrounded by disks of gas and dust, which slowly evolve into planetary systems. In this early stage, the stars are known as Young Stellar Objects (YSOs). Observations show that these disks disappear fairly quickly: by about 5 million years, roughly 80% of stars have already lost them.
Our targets lie in this critical transition period, when only a small fraction of stars still retain their disks. By studying their light, we can measure how gas from the disk is actively falling onto the star (a process called accretion) and identify what that gas is made of. This gives us a direct glimpse of the material in the disk that may eventually form planets and smaller bodies.
I would say that visual observations would be more useful in monitoring anomalous activity rather than ‘cadence’ photometry (I say that as a visual observer!)
Hi,
I observe already a number of YSO targets for HOYS (hoys.space) for several years. I am open to participate also for this request. I have a remote observatory in Chile.
So please share your target list as soon as possible to include those into my observing schedule. I have BVI photometric filters.
Josch
I have added a couple of targets in snapshot to my observing schedule. Still need to include those into my photometry program to get measurements into the AAVSO database.
Josch
I join in an earlier inquiry asking about the the time frame for this (until when in other words). Also, do it sounds like you want the data daily, when available.