Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1599s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Nov. 1988, p. 1599-1613.
Astronomy and Astrophysics
Astronomy
47
Blue Stars, Cepheid Variables, Red Giant Stars, Stellar Luminosity, Supergiant Stars, Color-Magnitude Diagram, Light Curve, Local Group (Astronomy), Magellanic Clouds, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
Cepheid variables have been found in the nearby Sm IV galaxy NGC 3109. Periods for 29 of the variables range from 31 to 5 days. The period-luminosity relation is well defined, showing the intrinsic scatter in magnitude at a given period due to the width of the instability strip. As expected, the P-L relation has a shallower slope than that of the standard calibration, caused by observational selection bias near the plate limit. The apparent blue distance modulus is (m-M)AB = 26.4. The brightest supergiants have absolute magnitudes of MB(3) = -7.6 for the mean of the three brightest blue stars, and MV(3) = -7.7 for the corresponding mean of the three brightest red stars. These absolute magnitudes agree with the previous calibration of the brightest red and blue star luminosities as a function of the absolute magnitude of the parent galaxy.
Carlson George
Sandage Allan
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