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[vsnet-const 18] d Ser

d Ser

   This star has been long known by binocular observers, but the nature seems
to be little known.  Although GCVS lists it as I: star with a range of
5.17-5.29 V, Hipparcos does not seem to record variability.
   Is this a genuine constant star?  Or has it stopped variability?

   The spectral type in GCVS is G0III+A6V.  According to Buscombe's catalog,
the spectrum is A0IV+G0III or G4(II)+B9.5V:

Regards,
Taichi Kato

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