NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T12:14:55 PDT
Help | Comment | NED Home

For refcode 1990AJ....100..108S:
Retrieve 36 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1990AJ....100..108S RR LYRAE STARS IN LOCAL GROUP GALAXIES. II. NGC 147 A. SAHA Mount Wilson and Las Campanas Observatories, Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, California 91101 and Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218 JOHN G. HOESSEL Washburn Observatory, University of Wisconsin-Madison, 475 N. Charter Street, Madison, Wisconsin 53706 AMY E. MOSSMAN Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218 Received 30 January 1990; revised 30 March 1990 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.
Retrieve 36 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home