A Comparison of Cepheids in the Small Magellanic Cloud with those in the Vicinity of the Sun.

Abstract

view Abstract Citations (29) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Comparison of Cepheids in the Small Magellanic Cloud with those in the Vicinity of the Sun. Arp, Halton C. ; Kraft, Robert P. Abstract The most recent observations of cepheids in the Small Magellanic Cloud and in the vicinity of the sun are examined. The two groups of cepheids are shown to differ in their period-frequency, period-amplitude, and period-color relations. The two period4uminosity relations are shown to be quite similar, but it cannot be proved that the zero points are closer than j 0.5 mag. The SMC cepheids differ most from solar neighborhood cepheids in having a large percentage of periods less than 4 days. Compared to galactic cepheids, SMC cepheids in this period range have much larger amplitudes of light-variation. A smafl difference, for this same period range, is that the SMC cepheids are about 0.1 mag. redder than those in the galaxy. By matching the two groups of cepheids together in different ways, true moduli (corrected for 0.25-mag. obscuration) of the SMC are obtained which range from (m - M)0 = 18.25 mag. to (m - M)0 = 18.45 mag. The population characteristics of the SMC cepheids are closer to "classical" cepheids than they are to population II (globular-cluster cepheids). Publication: The Astrophysical Journal Pub Date: March 1961 DOI: 10.1086/147045 Bibcode: 1961ApJ...133..420A full text sources ADS | data products NED (1)