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Hi Robin, Did anything come out of this work ? A fair question given that it takes so long. I need to apologize, but we are still working on it. In addition to the XMM-Newton observations, we also got data with the Chandra X-ray telescope. We decided to wait for that (the observation happened in 201...

I just wanted to share with you that we have now received the Chandra data. We thought it would be straigthforward to make a lightcurve to compare it with the H alpha equivalent width, but the data is better than we thought. T Tau N is actually a close binary itself separated be about 0.1 arcsec. Th...

Other Chandra observations on this object are programmed? Do you think it is useful to intensively observe this star now? Do you encourage this initiative ? It appears correct? Can you help for analyze the (potentials) results? Some of this is answered in my previous post, but not all of it :oops: ...

I have taken a brief look at the spectra in the database. Thank you so much, that is exactly what we hoped for. We now have to compare the optical spectra with the Chandra data, but we have not received the Chandra data yet (it typically takes 2-3 weeks after the observation - there is a delay of 1-...

Hi, looking at all the spectra you already posted in this thread, they look fantastic, almost too good! Classical T Tauri stars tend to be time variable on time scales below one hour. With Chandra, we get the data with a time resolution of just a few seconds. If nothing interesting happens, we can a...

Chandra has now released the schedule (OK, they may have done so two or three days ago, but I was busy with Christmas and moving into a new apartment): The Chandra observation will be Start time: 2015:001:13:25:25.870 (1. Jan 2015 13:25 UT) Stop time 2015:003:01:15:25.870 (3. Jan 2015 1:15 UT) (all ...

To give you an idea how wide H alpha is I attach a spectrum that we took a while ago (2014 Nov 10) with a 1.2m mirror and 180 seconds of exposure time.

Hi, I am an astronomer at the Harvard-Smithsonian Center for Astrophysics right now and I want to ask for your help with an observing project: We are working on classical T Tauri stars, trying to understand how exactly the disks around those stars interact with the star itself. The circumstellar dis...

Hallo, about two weeks ago I received the X-ray data (it takes 3-4 weeks until that is fully processed at the ESA data center). I have started with the analysis and I will post a few pictures below, so you get an idea what the X-rays look like. So far, I did not compare that to the optical spectra, ...

That's a pity, but nothing can be done about bad weather. As far as I know, XMM-Newton did the observations. If all went well I'll receive the data in 2-3 weeks. I'll post an image here when I get it so you can see why we do all this. All of you: Thanks for your help, even it the clouds stopped us t...