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Title:
Planetary nebulae in local group galaxies. IV - Identifications, positions, and radial velocities of nebulae in NGC 147 and NGC 185
Authors:
Ford, H. C.; Jacoby, G.; Jenner, D. C.
Affiliation:
AA(California, University, Los Angeles, Calif.), AB(California, University, Los Angeles, Calif.), AC(California, University, Los Angeles, Calif.)
Publication:
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 18-26. Research supported by the Research Corp. and University of California (ApJ Homepage)
Publication Date:
04/1977
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Galactic Clusters, Globular Clusters, Local Group (Astronomy), Planetary Nebulae, Radial Velocity, Reference Stars, Interstellar Matter, Position Errors, Stellar Mass Ejection, Stellar Motions, Stellar Spectrophotometry, Velocity Errors, Velocity Measurement
DOI:
10.1086/155123
Bibliographic Code:
1977ApJ...213...18F

Abstract

Identifications are presented for five planetary nebulae in NGC 147. Equatorial coordinates of these planetaries, six nearby reference stars, and five planetaries previously identified in NGC 185 are given which have an estimated accuracy of at least 1.0 arcsec relative to the AGK3 and at least 0.5 arcsec relative to one another. Radial velocities are determined for the nebulae in both galaxies, errors in the determinations are analyzed, and a value of approximately -40 km/s is obtained for the average difference between the radial velocities of one planetary in each galaxy. The possibility that NGC 185 and NGC 147 are a gravitationally bound pair is discounted, and a lower limit to the production rate of the interstellar medium in these galaxies is estimated. It is concluded that a galactic wind is blowing in NGC 147 and may be either a thermally steady cool wind powered by expanding planetary shells, a thermally steady hot wind driven by supernovae, or a wind that blows alternately hot and cool. Equatorial coordinates and identifications are also provided for four globular clusters in NGC 147 and six globular clusters in NGC 185.

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Part  1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  8     Part  7     Part  9    


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