RR Lyrae stars in local group galaxies. II - NGC 147

Abstract

view Abstract Citations (40) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS RR Lyrae Stars in Local Group Galaxies. II. NGC 147 Saha, A. ; Hoessel, John G. ; Mossman, Amy E. Abstract Deep CCD images of NGC 147 taken with the "4-shooter" on the Hale 5 m telescope have been processed to find and photometrically measure RR Lyrae stars. 36 variable stars have been found, of which 32 are surmised to be RR Lyrae stars. Finding charts, periods, and light curves are presented. The mean magnitude of the RR Lyraes is determined to be <g> = 25.25 mag. A distance modulus 23.92 is derived, based on the best currently available values of foreground extinction and mean absolute magnitudes of RR Lyrae stars. A wide range of periods is seen for the RR Lyrae stars, indicating a correspondingly wide range of metallicities for the stars in NGC 147. The distance modulus derived here places NGC 147 at a distance of 154 kpc from the center of M31, and in conjunction with the line sight velocities of these two galaxies, this implies a lower limit of 7.2X10^11^ M_sun_ for the mass of M31. Publication: The Astronomical Journal Pub Date: July 1990 DOI: 10.1086/115495 Bibcode: 1990AJ....100..108S Keywords: Astronomical Photometry; Galaxies; Local Group (Astronomy); Variable Stars; Charge Coupled Devices; Light Curve; Metallicity; Stellar Magnitude; Astrophysics; STARS: RR LYRAE; GALAXIES: INDIVIDUAL; GALAXIES: LOCAL GROUP; GALAXIES: STELLAR CONTENT full text sources ADS | data products SIMBAD (39) NED (36) Related Materials (3) Part 1: 1990AJ.....99...97S Part 3: 1992AJ....103...84S Part 4: 1992AJ....104.1072S