Photometric anomalies in the metal-deficient red giants, BD -18 deg 5550 and CD -38 deg 245

Details Photometric anomalies in the metal-deficient red giants, BD -18 deg 5550 and CD -38 deg 245 Photometric anomalies in the metal-deficient red giants, BD -18 deg 5550 and CD -38 deg 245

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..237t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 237-253.

Other

24

Anomalies, Metallicity, Red Giant Stars, Stellar Spectrophotometry, Abundance, Stellar Atmospheres, Ubv Spectra

Scientific paper

Three distinct anomalies affecting the red giants CD -38 deg 245 and BD -18 deg 5550 are examined with reference to new uvby photometry data for metal-deficient red giants. In particular, it is demonstrated that shortward of 4200 A, CD -38 deg 245 exhibits an ultraviolet deficiency for a star of its temperature when compared with stars of higher metallicity. In contrast, BD -18 deg 5550 may contain an ultraviolet excess. Another problem is that CD -38 deg 245 is a variable star in the ultraviolet. Possible explanations for these anomalies are considered.

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