FIELD NUMBER-3 OF THE PALOMAR-GRONINGEN SURVEY II - NEAR-INFRARED PHOTOMETRY OF SEMIREGULAR VARIABLES

Near-infrared photometry (JHKL'M) was obtained for 78 semiregular vari ables (SRVs) in field #3 of the Palomar-Groningen survey (PG3, I = 0 d egrees, b = -10 degrees). Together with a sample of Miras in this fiel d a comparison is made with a sample of field SRVs and Miras. The PG3 SRVs form a sequence (period - luminosity & period-colour) with the PG 3 Miras, in which the SRVs are the short period extension to the Miras . The field and PG3 Miras follow the same P(J-K)(0) relation, while th is is not the case for the field and PG3 SRVs. Both the PG3 SRVs and M iras follow the Sgr I period-luminosity relation adopted from Glass et al. (1995). They are likely pulsating in the fundamental mode and hav e metallicities spanning the range from intermediate to approximately solar.