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The red clump giants are potentially very useful as standard candles. There is some controversy about the stability of their I-band absolute magnitude, but it does not seem to be serious. No controversy was anticipated about their colors, with metal rich giants expected to be redder and cooler than the metal poor giants. The purpose of this paper is to point out that no such correlation is apparent between [Fe/H] and Teff as determined with Washington CCD photometry for the giants in Baade's Window. No explanation is offered for this surprising result. It is also unknown why the Galactic bulge red clump giants are redder than the clump giants near the Sun by 0.2 mag in the (V-I)0 color.
Czasopismo
Rocznik
Tom
Strony
405--412
Opis fizyczny
Bibliogr. 18 poz., wykr.
Twórcy
autor
- Princeton University Observatory, Princeton, NJ 08544-1001, USA
Bibliografia
- Castellani, V., Chieffi, A., and Straniero, O. 1992, Astrophys. J. Suppl. Ser., 78, 517.
- Cole, A.A. 1998, Astrophys. J. Letters, 500, L137.
- Geisler, D., and Friel, E.D. 1992, Astron. J., 104, 128.
- Girardi, L., Groenewegen, M.A.T., Weiss, A., and Salaris, M. 1998, MNRAS, submitted, (astroph/9805127).
- Høg, E., and Flynn, C. 1998, MNRAS, 294, 28.
- Jimenez, R., Flynn, C., and Kotoneva, E. 1997, MNRAS, submitted, (astro-ph/9709056).
- Kiraga, M., Paczyński, B., and Stanek, K.Z. 1997, Astrophys. J., 485, 611.
- Paczyński, B., and Stanek, K.Z. 1998, Astrophys. J. Letters, 494, L219.
- Perryman, M.A.C. et al. 1997, Astron. Astrophys., 323, L49.
- Sadler, E.M., Rich, R.M., and Terndrup, D.M. 1996, Astron. J., 112, 171.
- Seidel, E., Demarque, P., and Weinberg, D. 1987, Astrophys. J. Suppl. Ser., 63, 917.
- Stanek, K.Z., and Garnavich, P.M. 1998, Astrophys. J. Letters, 503, L131.
- Stanek, K.Z, Zaritsky, D., and Harris, J. 1998, Astrophys. J. Letters, 500, L141.
- Taylor, B.J., Johnson, S.B., and Joner, M.D. 1987, Astron. J., 93, 1253.
- Udalski, A. 1998a, Acta Astron., 48, 113.
- Udalski, A. 1998b, Acta Astron., 48, 383.
- Udalski, A., Szymański, M., Kałużny, J., Kubiak, M., and Mateo, M. 1993, Acta Astron., 43, 69.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-c88ba6b5-a196-416a-9aff-fc143cf5f591