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ASASSN-21gk in sagittarius - spectra urgently required !
Posted: Sat May 01, 2021 10:21 am
by Robin Leadbeater
https://groups.io/g/spectro-l/topic/asa ... t/82501723?
Originally suspected to be a gravitational microlensing event the light curve over the past week has been varying rapidly in an erratic way
Re: ASASSN-21gk in sagittarius - spectra urgently required
Posted: Mon May 03, 2021 10:41 am
by Robin Leadbeater
A spectrum has now confirmed it as an "ordinary star" so the source of the variability is unclear.
https://www.astronomerstelegram.org/?read=14593
A series of spectra covering a period of variability could be interesting. (The clouds returned less than a minute after I got the star on the slit of the ALPY600 when it finally cleared the rooftop at 16 deg altitude). Although extremely noisy, the spectrum was also consistent with the "normal star" description)
Cheers
Robin
Re: ASASSN-21gk in sagittarius - spectra urgently required
Posted: Wed May 05, 2021 10:07 pm
by Robin Leadbeater
Very low from here but I tried it again. Here it is in the BAA database overlaid on Pickles G0v
https://britastro.org/specdb/data_graph ... _id=p_g0v
(One of the most frustrating observations I have tried to make. It skimmed along the roof line just arcminutes below it for over an hour before it finally popped up just as the sky was starting to brighten.) It was still at air mass 3.5 and there was thin cloud so the SNR is poor but consistent with the type reported previously (late F /early G)
https://www.astronomerstelegram.org/?read=14593
Cheers
Robin