Search found 46 matches
- Fri Nov 04, 2022 3:34 pm
- Forum: Be Stars survey
- Topic: Call for monitoring Be stars in the TESS sectors
- Replies: 94
- Views: 114169
Re: Call for monitoring Be stars in the TESS sectors
It's been a while since my last update, but TESS is currently observing Be stars in the northern hemisphere. I've compiled a target list, sorted according to when TESS is observing various fields in this 'cycle 5' https://docs.google.com/spreadsheets/d/1RjCObOwWctgK7C3qY2Z2okBzQuvdbds5hGHAH8--4gY/ed...
- Wed Aug 11, 2021 8:15 pm
- Forum: Be Stars survey
- Topic: Call for monitoring Be stars in the TESS sectors
- Replies: 94
- Views: 114169
Re: Call for monitoring Be stars in the TESS sectors
Small update: 12 Vul is definitely ejecting material now. Comparing a spectrum from today (the reddest line w/ strongest emission) vs. yesterday, Halpha emission has clearly increased, and the red/blue asymmetry is varying (the ejected material so far is not azimuthally symmetric). I have some more ...
- Tue Aug 10, 2021 7:25 pm
- Forum: Be Stars survey
- Topic: Call for monitoring Be stars in the TESS sectors
- Replies: 94
- Views: 114169
Re: Call for monitoring Be stars in the TESS sectors
While I'm at it... The bright Be star and member of the Pleiades, Merope (= 23 Tau), might be a nice target to monitor closely. In the below plot made from ~25 years of BeSS spectra, you can see that the emission level has been fading since ~1995. I observed Merope a few days ago and the Halpha doub...
- Tue Aug 10, 2021 6:53 pm
- Forum: Be Stars survey
- Topic: Call for monitoring Be stars in the TESS sectors
- Replies: 94
- Views: 114169
Re: Call for monitoring Be stars in the TESS sectors
Quick update on 12 Vul. TESS is observing this Be star from July 23 until Aug. 20. I got a spectrum a few minutes ago (JD = 2459437.2) that shows Halpha at clearly higher emission levels compared to 3 days ago, so it is currently in the process of building up a disk (or at least recently ejected mat...
- Tue Jun 22, 2021 3:56 am
- Forum: Be Stars survey
- Topic: Call for monitoring Be stars in the TESS sectors
- Replies: 94
- Views: 114169
Re: Call for monitoring Be stars in the TESS sectors
Hi everyone, TESS is returning to the northern hemisphere in a few days (June 24 2021) where the satellite will continue to observe large parts of the northern sky for the next 15 months. Here is a spreadsheet that lists the classical Be stars that will be observed photometrically by TESS: https://d...
- Tue Feb 02, 2021 4:34 pm
- Forum: Be Stars survey
- Topic: HeI 6678 Campaign of gamma Cas
- Replies: 16
- Views: 40309
Re: HeI 6678 Campaign of gamma Cas
Hi Jack, Weird feature. Do you think it is real (in the sense that it is astrophysical and not some detector artifact)? I took spectra of gamma Cas on the night of Jan 15 (UT time ~01:30 Jan 16) and there is no sign of this feature in my sequence of 13 exposures. There shouldn't be any photospheric ...
- Sun Jan 24, 2021 4:14 pm
- Forum: Be Stars survey
- Topic: 28 Tau ARAS monitoring
- Replies: 60
- Views: 232732
Re: 28 Tau ARAS monitoring
Hi Ernst, I'm looking ahead at interesting Be star targets that are being observed by TESS over the next ~1.5 years. 28 Tau ( = Pleione) is one of them- it is being observed by TESS for three months between 2021-Aug-20 - 2021-Nov-06. I believe this window also includes a periastron passage. Going by...
- Tue Jan 05, 2021 11:46 pm
- Forum: Be Stars survey
- Topic: Call for monitoring Be stars in the TESS sectors
- Replies: 94
- Views: 114169
Re: Call for monitoring Be stars in the TESS sectors
Hi all, Just a short and quick update. I'm now processing the TESS data from last year (TESS yr 2; July 2019 - July 2020), and including the relevant BeSS/ARAS spectra whenever possible. Presently I'm focusing on 'flicker' stars, or stars that experience short-lived (~days) mass ejection. This plot ...
- Sat Dec 26, 2020 10:46 pm
- Forum: Be Stars survey
- Topic: pi Aqr V/R and EW monitoring
- Replies: 29
- Views: 63570
Re: pi Aqr V/R and EW monitoring
Hi Ernst, Thanks for the update and for reminding me about that paper. I've been observing pi Aqr from about June - November 2020 with spectroscopy, but I've mostly waited on analyzing the data until space photometry from the BRITE satellites becomes available for pi Aqr over the same observing base...
- Fri Dec 18, 2020 3:14 pm
- Forum: Be Stars survey
- Topic: pi Aqr V/R and EW monitoring
- Replies: 29
- Views: 63570
Re: pi Aqr V/R and EW monitoring
Hi Ernst, Really interesting development. I know we emailed a bit about this, so hopefully you don't mind me posting here too. Hydrodynamical models predict that binary-induced disk oscillations produce m = 2 density waves, illustrated in this plot: Chojnowski_et-al_2018.png Fig. from 2018ApJ...865....