Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-13
Astronomy and Astrophysics
Astrophysics
51 pages, 22 figures, AJ, accepted, larger figures 1-3 available at ftp://ftp.pa.msu.edu/pub/smith
Scientific paper
10.1086/340185
B and V photometry has been obtained for variable stars in the northeast arm of the Small Magellanic Cloud (SMC). Periods and lightcurves have been determined for 237 periodic variables, including 201 Cepheids, 68 of which are newly discovered. Fundamental mode Cepheids and first overtone mode Cepheids are generally well separated in the B,V color-magnitude diagram, with the latter having bluer mean colors than the former. The Cepheid period-color relationship for this outlying SMC field is indistinguishable from that seen in more centrally located SMC fields, and is bluer than theoretical predictions. The red edge to the populated portion of the instability strip shifts to bluer colors for fainter Cepheids. There is support from our sample for a previously reported steepening in the slope of the period-luminosity relation for fundamental mode Cepheids near a period of 2 days. The Cepheids of the northeast arm may be closer to us than are those of the main body of the SMC, but the difference is smaller than or equal to about 4 kpc, comparable to the tidal radius of the SMC.
Pritzl Barton
Sharpee Brian
Silbermann Nancy
Smith Horace
Stark Michele
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