Bright giants in the Sagittarius dwarf galaxy

Details Bright giants in the Sagittarius dwarf galaxy Bright giants in the Sagittarius dwarf galaxy

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996newa....1...57w&link_type=abstract

New Astronomy, vol. 1, no. 1, p. 57-75.

Astronomy and Astrophysics

Astronomy

37

Local Group, Galaxies: Individual: Sagittarius, Stars: Carbon, Stars: Late-Type, Stars: Variables, Infrared: Stars

Scientific paper

Near-infrared photometry is presented of 75 late-type giants in the direction of the Sagittarius dwarf galaxy. 71 of these are thought to be members of the galaxy; the other four are late-type M stars in the Bulge. The carbon stars and possible carbon stars have a wide range of properties. The reddest ones are similar to carbon stars in Fornax, while the bluest are more like those in Sculptor, Draco and Ursa Minor. A clearly defined giant branch indicates a metallicity slightly weaker than that of 47 Tuc and a value of [Fe/H]<~-0.8 is estimated. The most luminous star which is a confirmed member of the dwarf galaxy is a carbon star with M_bol~-4.5. Four variable stars have been discovered; these are probably of the semi-regular and/or Mira type with periods of the order of 150 to 300 days.

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