AT2020cfg - what is it ??

AT2020cfg - what is it ??

Postby Robin Leadbeater » Mon May 18, 2020 11:20 am

Occasionally you see a crazy spectrum that makes you think "what is going on ??" Take a look at AT2020cfg
https://wis-tns.weizmann.ac.il/object/2020cfg

AT2020cfg_TNS.png
AT2020cfg_TNS.png (45.23 KiB) Viewed 273 times


The classifiers suggest a very reddened Ae/Be star. H alpha is certainly in emission and it is certainly very red and there are no molecular bands, suggesting a hot continuum.
The Na D absorption is unexpectedly weak though for high IS extinction. H beta is in absorption, H gamma is missing but there is an extremely strong emission line at H delta. There are several other unidentified emission lines which do not match He. Does anyone have any idea what is going on with this strange star ?

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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