SauliusR on 06-Feb-2013 11:07:01 GMT about HD 23792
The most likely origin is 1998A&AS..132..173L table 1.
Table 1 lists "Optical counterparts to X-ray sources excluded from the sample".
I have checked random star entries from that table: HD 34096 (A0), V* V1228 Tau (A4V), HR 1875 (B2.5IV), 1RXS J034308.0+185836 (Seyfert 1 Galaxy)... It seems that all objects from that table 1 have erroneous classification tags of TT*.
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View annotation on HD 23792 object