View Online

YSO Bulletin
- October 2020 -

- Watch out for the Bull -

...But watch the Webinar first!

Many who listened to the YSO webinar complained of my poor sound quality, and while I noticed nothing at my end, of course I believe everyone who pointed the fact out. Also, when I have given other talks, the same thing has been mentioned. The other speakers were not affected. From this I conclude that there is a problem with how zoom interacts with my microphone. But! All is not lost... if you listen to the webinar on the AAVSO YouTube channel, there it is - with no sound problems!
The talk itself starts at about 8 minutes in, and if the screen does not change (i.e., if you can still see Bert Pablo, who starts the webinar off) try setting the screen to cinema view.

Bo steps down!

Prof. Bo Reipurth, editor of the Star Formation Newsletter since its (pardon the pun) formation, has decided to step down from the post. He says "... it has also been a challenge every month to find the time to prepare an issue, no matter what other things I was doing, or where I was". Bo Reipurth was of course one of the speakers at the Webinar and was, in addition, one of the main driving forces behind this (far more modest) publication that you, gentle reader, are looking at. In addition he is a very, very nice man - and I trust he will soon be sunning himself outside a nice little shack somewhere in North Kona.

The SFN itself will continue from next month under the editorship of João Alves at the University of Vienna. Bo does say however that his interviews with astronomers working in the field will continue, since an interview has been a constant feature of every SFN. In fact he has created an archive of all 77 interviews which will be a fantastic resource for anyone interested, both amateur and professional.
The interviews are accessible at "Studies in Star Formation"

A load of Bull

October sees the emergence of the huge Taurus-Auriga starforming region, the closest area of starbirth to the solar system. This is primarily composed of T-associations, where mainly lower-mass stars such as the Sun are being formed. There are however several individual stars that have been comparatively well-followed or which are especially notable objects such as RR and VY Tau, SU and RW Aurigae. An outlying part of this large area is the λ Ori association whose members include CO and GW Ori. The latter of these is a bright (10m) object that amateurs can follow both visually and spectroscopically. It features in fact in the current edition of the SFN, where it appears as the favourite object of astronomer Stefan Kraus: "A pre-main-sequence triple with a warped disk and a torn-apart ring".
I have been following this star for several years now, and while it has not always been thrilling visually, bear in mind that the description above also applies to another object which has definitely rewarded watching - RW Aurigae. Therefore I suggest we keep an eye in this one, which is in fact in the same field as CO Ori. The system consists of a close pair with a 242-day orbit and a more distant third star that revolves around the central pair in about 11 years. the masses of the components have been subject to debate but they appear to be at the upper end for T Tauri objects. The whole environment is a very dynamic one, and the full article is very informative. It can be seen in the current SFN

RY Lupi's dusty disc

A Dublin-based group has revised greatly details of the very young, active star RY Lup which harmonises these details better with the Lupus Group of which it is a member. It turns out the object is more luminous than previously thought and possesses an inner disc with a different inclination to that produced by previous models.