Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1072s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 3, Sept. 1992, p. 1072-1085.
Astronomy and Astrophysics
Astronomy
60
Charge Coupled Devices, Local Group (Astronomy), Lyra Constellation, Star Formation, Variable Stars, Astronomical Photometry, Light Curve, Magellanic Clouds, Stellar Magnitude
Scientific paper
Deep charge-coupled device images of a field in IC 1613 away from the star forming central regions were taken with the '4-shooter' on the Hale 5 m telescope, and processed to find photometrically measure variable stars. Fifteen RR Lyrae stars were found, and periods, light curves, and finding charts for them are presented. The mean magnitude of RR Lyrae stars in this galaxy is deduced to be 24.90 mag. Assuming the absolute g magnitude for RR Lyraes to be Mg = 0.73 mag, and using extinction Ag = 0.07 mag, a distance modulus of 24.10 +/- 0.27 mag is derived. The finding of RR Lyrae stars indicates the unambiguous presence of an old population. The distance modulus derived from them is smaller than that derived from the Cepheids by an amount which is dependent upon the RR Lyrae zero-point calibration adopted, and may be as large as 0.3 mag. The difference has the same sense and magnitude as the discrepancy in the LMC. The probable sources of the problem are discussed.
Freedman Wendy L.
Hoessel John G.
Mossman Amy E.
Saha Avishek
No associations
LandOfFree
RR Lyrae stars in Local Group galaxies. IV - IC 1613 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with RR Lyrae stars in Local Group galaxies. IV - IC 1613, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RR Lyrae stars in Local Group galaxies. IV - IC 1613 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1765618