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Astron. Astrophys. 338, 581-591 (1998)

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Field #3 of the Palomar-Groningen survey *

II. Near-infrared photometry of semiregular variables **

M. Schultheis 1, 3, Y.K. Ng *** 2, 3, 4, J. Hron 1 and F. Kerschbaum 1

1 Institut für Astronomie der Universität Wien, Türkenschanzstrasse 17, A-1180 Wien, Austria
2 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
3 Institut d'Astrophysique de Paris, CNRS, 98bis Boulevard Arago, F-75014 Paris, France
4 Padova Astronomical Observatory, Vicolo dell'Osservatorio 5, I-35122 Padua, Italy
((hron;kerschbaum;schultheis)@astro.ast.univie.ac.at; schulthe@iap.fr; yuen@pd.astro.it)

Received 10 May 1996 / Accepted 21 July 1998


Near-infrared photometry (JHKL[FORMULA]M) was obtained for 78 semiregular variables (SRVs) in field #3 of the Palomar-Groningen survey (PG3, [FORMULA], [FORMULA]). Together with a sample of Miras in this field a comparison is made with a sample of field SRVs and Miras. The PG3 SRVs form a sequence (period - luminosity & period - colour) with the PG3 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 this is not the case for the field and PG3 SRVs. Both the PG3 SRVs and Miras follow the Sgr I period-luminosity relation adopted from Glass et al. (1995). They are likely pulsating in the fundamental mode and have metallicities spanning the range from intermediate to approximately solar.

Key words: stars: evolution – stars: AGB and post-AGB – Galaxy: center

* Based on observations obtained at the European Southern Observatory, La Silla, Chile
** Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr/pub/cats/J/A+A/338/581 ( or WWW at URL http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/338/581
*** Present address: Space Research Organisation Netherlands (SRON), Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands

Send offprint requests to: M. Schultheis
Correspondence to: schulthe@iap.fr

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© European Southern Observatory (ESO) 1998

Online publication: September 14, 1998