HOYS Citizen Science

Newsletter Contents

Welcome to the HOYS newsletter for July 2021. We are happy to announce the acceptance of our latest paper for publication and our continued collaboration with LCO. We close with a brief reminder of our current target priorities.
Regarding our participants contributions: In recent months we have seen that several long term contributors have left the project. While we are naturally sad to see people leave, we would like to say a heartfelt thank you to all our contributors. Your data will be of continued use for the project and will certainly be part of many future publications.

New Paper accepted

After just over one year of work, our paper on finding rotation periods of young stars in the Pelican Nebula (IC5070) field has now been accepted for publication by MNRAS. Thank you very much to everyone who contributed data (you are all co-authors) and in particular those who helped analysing the data and writing the paper.
The link to the full accepted version of the paper is on the publications page on the website. Just in case, could the co-authors do a final check of their names and affiliations in the PDF version and let me know any errors immediately - as the proofs should be send to us very soon.

We have now started work on two further small papers. In one we analyse three sources in the Sigma-Ori field. This is already in an advanced draft form. In the second small paper we plan to determine the spot properties (temperature and size) of the periodic variables we have identified in the Pelican Nebula. The aim is to finalise both of these before the end of the year. After that, we will start working on the next general paper with everyone as co-author. In that we will look at the evolution of the spots on the stars in IC5070.

phaseplot_HST
Figure: Phase folded B (blue), V (green), R (red), and I (black) photometry data for one of the Sigma-Ori sources. We over plot a running median and one sigma scatter of the data from the median. The R data is shown at the correct magnitude, the other data are shifted for best visibility. The periodicity of this star cannot be explained by a surface spot. Instead it is most likely caused by an asymmetric inner disk warp, due to a misalignment of the magnetic axis of the star and the rotational axis of the disk.

Collaboration with LCO

We are happy to announce that we have had our status as Global Sky Partner for LCO renewed for another year. Our aim for the coming year is to exclusively work with teachers. We plan to train them in setting up, process and analyse data for HOYS with the LCO network, and then to utilise the HOYS data for school science projects such as measuring rotation periods of stars and investigations of occultations by disk material. The teachers will also get access to the Faulkes telescope and our goal is to train teachers to a level where they can use, together with their pupils, the Faulkes telescope for their own science projects or continued long-term involvement in HOYS.
The details of the application process (very similar to last years) will be posted on the website soon. Hence, if anyone has any teacher contacts who might be interested in this program, please let them know to keep an eye out for this on our website or social media.

Observations, Target priorities

Our usual spring/early summer slump, with short nights and many targets either invisible or very low (early morning objects) is now over. Thus, we would like to encourage everyone to continue taking data. All summer targets are now visible at the start of the night, and we already had the first images of the two Perseus targets send to us this week. Winter is coming!
There are no current high priority targets, but note that as every year: Please try to image IC5070 in all filters each night for the entire month of August. Thank you very much.
HOYS Citizen Science
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