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Conference contributions – summer 2019 edition

Although the summer has finished long ago, only now I got some time to update on summer activities, i.e. a number of conferences I attended and contributed to. Since 2018, I have been working in an automated classifier for massive stars in nearby galaxies, using photometric datasets. These have been produced by my colleagues within […]

New paper on rho Cas and its recent outburst in 2013

A new outburst of the yellow hypergiant star Rho Cas Michaela Kraus, Indrek Kolka, Anna Aret, Dieter H. Nickeler, Grigoris Maravelias, Tõnis Eenmäe, Alex Lobel, Valentina G. Klochkova Yellow hypergiants are evolved massive stars that were suggested to be in post-red supergiant stage. Post-red supergiants that evolve back to the blue, hot side of the […]

IRAF’s reject parameter: crreject or avsigclip ?

From “A User’s Guide to CCD Reductions with IRAF” by Philip Massey (iraf’s photometry docs) we read at page 19 §3.8 that there are two useful options to set the reject parameter: > reject parameter = crreject when we know the gain and read noise of our camera > reject parameter = avsigclip where the […]

SIMPLER DSLR processing and photometry for epsilon Aurigae

A previously published procedure for processing DSLR images with IRIS was somehow complicated. Though it may be more accurate since all the necessary steps for processing images are given, the procedure presented here seems to give the same results without making so much trouble! Since we have a bright target and small total exposure times […]

DSLR processing and photometry for epsilon Aurigae with IRIS

Prepared for the CitizenSky.org ‘s DSLR tutorials (with the help of bikeman and Roger_Pieri). CitizenSky.org is dedicated to the eclipsing binary epsilon Aurigae, but the procedure is more general and can be applied to any star. ~ ~ ~ For easiest use download the last version of IRIS 5.58 (especially for any Linux user because […]