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Colour-magnitude diagram of NGC 5053

Journal Article:

Abstract

The colour-magnitude diagram of NGC 5053 has been derived to V = 21.1 from photographic and electronographic observations. The electronographic observations were obtained with an experimental Spectracon image-converter, having photocathode and exit window dimensions of 20 x 30 mm, mounted at the prime-focus of the 120-in. Lick reflector. The photographic observations were obtained with the 20-in. Carnegie astrograph and the 36-in. Crossley reflector. The colour-magnitude diagram resembles that of M92, with the difference that a red horizontal branch is more pronounced than the asymptotic branch in NGC 5053. The topology of the horizontal branch is that of clusters with an intermediate metal content and is thus at variance with the mean period of the RR Lyr stars and the unreddened colour of the subgiant branch read at the magnitude level of the horizontal branch, both of which would indicate an extremely low metal content. If comparison of the colour-magnitude diagrams of NGC 5053 and M92 is valid, then the reddening of NGC 5053 is Esub(B-V) = 0.02 and the apparent distance modulus is m-M = 16.08 +- 0.08.
Authors:
Walker, M F; Pike, C D; [1]  McGee, J D
  1. California Univ., Santa Cruz (USA). Lick Observatory
Publication Date:
Jun 01, 1976
Product Type:
Journal Article
Reference Number:
AIX-07-267023; EDB-77-015114
Resource Relation:
Journal Name: Mon. Not. R. Astron. Soc.; (United Kingdom); Journal Volume: 175:3
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; STAR CLUSTERS; PHOTOMETRY; BRIGHTNESS; CHEMICAL COMPOSITION; COLOR; DIAGRAMS; GALACTIC EVOLUTION; MILKY WAY; STAR EVOLUTION; STARS; GALAXIES; OPTICAL PROPERTIES; ORGANOLEPTIC PROPERTIES; PHYSICAL PROPERTIES; 640105* - Astrophysics & Cosmology- Galaxies
OSTI ID:
7344726
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MNRAA
Submitting Site:
INIS
Size:
Pages: 525-531
Announcement Date:

Journal Article:

Citation Formats

Walker, M F, Pike, C D, and McGee, J D. Colour-magnitude diagram of NGC 5053. United Kingdom: N. p., 1976. Web.
Walker, M F, Pike, C D, & McGee, J D. Colour-magnitude diagram of NGC 5053. United Kingdom.
Walker, M F, Pike, C D, and McGee, J D. 1976. "Colour-magnitude diagram of NGC 5053." United Kingdom.
@misc{etde_7344726,
title = {Colour-magnitude diagram of NGC 5053}
author = {Walker, M F, Pike, C D, and McGee, J D}
abstractNote = {The colour-magnitude diagram of NGC 5053 has been derived to V = 21.1 from photographic and electronographic observations. The electronographic observations were obtained with an experimental Spectracon image-converter, having photocathode and exit window dimensions of 20 x 30 mm, mounted at the prime-focus of the 120-in. Lick reflector. The photographic observations were obtained with the 20-in. Carnegie astrograph and the 36-in. Crossley reflector. The colour-magnitude diagram resembles that of M92, with the difference that a red horizontal branch is more pronounced than the asymptotic branch in NGC 5053. The topology of the horizontal branch is that of clusters with an intermediate metal content and is thus at variance with the mean period of the RR Lyr stars and the unreddened colour of the subgiant branch read at the magnitude level of the horizontal branch, both of which would indicate an extremely low metal content. If comparison of the colour-magnitude diagrams of NGC 5053 and M92 is valid, then the reddening of NGC 5053 is Esub(B-V) = 0.02 and the apparent distance modulus is m-M = 16.08 +- 0.08.}
journal = {Mon. Not. R. Astron. Soc.; (United Kingdom)}
volume = {175:3}
journal type = {AC}
place = {United Kingdom}
year = {1976}
month = {Jun}
}